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My sense is that the bulk of the additional steering weight, once up to speed, is from the offset. The scrub radius is shown at the bottom at .427”. Typically the scrub radius is configured to be as small as possible to minimize the effects under braking, but squirm (from zero scrub radius) is also undesirable. That's .25" positive scrub radius I assume. The caster is a side-view issue. ''Positive scrub radius (about 2 mm). Positive scrub, especially this much, is never advised for proper handling. Class 1 off road, 1/2 to 3/4” of scrub radius. This makes it heavy unless you move a bit too. The scrub radius Altering wheel offsets also affects the scrub radius. Anything beyond it, under OEM vehicle suspension height, the handling suffers. The main effect of this is to introduce a turning moment. 3. Effect of Wheel Offset Change on Scrub Radius And from Wikipedia: [QUOTE]The net effect of running an offset LESS in the positive is poor steering control and it develops what is known as "tram lining" over uneven surfaces (The wheels pull to either … It's how far the centerline of tire moves outside of the steering axis iclination (SAI). However by using 10.5" CCW wheels with the allowable SCCA 0.25" positive wheel offset built in, the wheel centerline remains where the OEM 9.5" 's is and the Zero scrub radius is retained. Are you going to put a string pot on the steering column and start parsing individual foot pounds of torque necessary to make the wheel reach 45° at X speed with different offset wheels? Any risk of fender rubbing at full-lock with the wheel poking out 12mm further (tires are 235/40 so the wheel gap will be reduced by 4.5mm) Thanks. Scrub radius, to my knowledge, cannot be calculated to an exact number. Honda UK A common response to criticism of downsizing wheels on a … Spacing wheels out by means of smaller offsets or spacers increases the scrub radius. I ran 6mm spacers on my +42's and it was reasonable on my 17x8's but i … Cars with strut suspension are more likely to have a negative scrub radius, and cars with double A-arm suspension are more likely to have a positive scrub radius. ''Positive scrub radius (about 2 mm). Offset also affects suspension stiffness through the suspension's motion ratio. New Posts; Member List; Mark All As Read; Forum; Technical; Suspension, Brakes and Handling; If this is your first visit, be sure to check out the FAQ by clicking the link above. Almost no difference.Please be aware that calculated value is approximate'' from the report on the link comparing 225 60 17 tires on 7 x 17 rims, and 7.5x17 rims that you wanted because you can get a better selection. I wonder if any one would have any thoughts on a problem I have. Typically the scrub radius is configured to be as small as possible to minimize the effects under braking, but squirm (from zero scrub radius) is also undesirable. It could be positive, negative or zero. A positive scrub radius tends to be beneficial while braking into a turn. Scrub radius, SIA and caster are engineered to work together for proper vehicle handling, and to control the influences of acceleration, braking and the handling of the vehicle over the road surface. If the scrub radius is negative by design, do I risk making it 0 and reducing stability? Offset radius can be negative or positive by just a few mm. 3. Our scrub radius is again positive, but this time it only goes up to +4mm. It is only referred to as positive or negative. Since the scrub radius has to do with steering geometry, such positive offset requirements only apply up front. The tire's centerline will be 18mm further outboard than before (wider track). If you had positive scrub radius, (towards the inside of the wheel center) and you had different braking in the two wheels, it would jerk the wheel out of a straight line, making the car unstable. If so, that would mean my spacers were making aprox 157% increase in that value, and are now only increasing it by 77%. With some trepidation, I switched from the stock set up (+48 offset) to 225 MPSS on 17x8 +35, so a 13mm difference in offset/scrub along with more grip and more tread width, but not huge differences. I would say 15-20mm of increase is something the majority of drivers wouldn't really notice.. it's only when you get silly and start fitting huge spacers / wheel offsets that you start really messing things up! The scrub radius is a front-view issue. The diagram shows a positive offset in which the mounting surface is outside of the wheel centreline. If it's got negative then I wouldn't add too much more but I also wouldn't use much less. Positive scrub radius does no favours for braking if for any reason there’s a different amount of force between sides of the vehicle, say, if the left-hand wheels have less grip and the ABS backs the system off on that side. Typically you want to be under +/-5mm variance from OEM scrub radius. Scrub radius can only be moved by rim off set or bending the stub axle and changing the king pin inclination which is defently not the go. The dynamic scrub radius is displayed below the camber read out. An increase in positive scrub radius also causes the wheel to gain positive camber when the wheels are being turned, reducing grip in corners on the front wheels and producing understeer. A negative scrub radius is suitable for vehicles with high power engine and a positive scrub radius offset for small power engines. Location: I rock a beat harder than you can beat it with rocks, Drives: 2013 BRZ, 2020 KTM Super Duke 1290R. Keep the same scrub radius as what the car came with, no more. - posted in The Technical Forum Archive: Hi Chaps, can I ask a question please. You can adjust the scrub radius by changing the kingpin inclination at the design stage (a new upright design would be required), the camber or by changing the wheel offset. Most manufacturers design cars with a negative scrub radius up front that is made possible by positive offsets. Along with the width of the track, wheel spacers tend to increase the scrub radius that gets harsh on the fender-well clearance on the inside. To compensate for a wider wheel: A wider wheel with the exact same scrub radius as the stock wheel will be positioned closer to the suspension components. Thanks, Central TEXAS Sleeper Experimental Physicist '64 Riviera T-type: 4.1L Buick Turbo6, 4L80E, L67 OBDII SEFI swap ROA# 9790. By using a positive offset in a wider wheel the Scrub radius can remain stable. I see that Daved has shown some images were negative scrub radius occurs. Changing the scrub radius will change the driving behaviour (e.g. Is it particularly noticeable? 1. 1. Our scrub radius is again positive… 1994 Golf MkIII 4 stud 256mm 20mm 5.10mm 1986 Jetta MkII 4 stud 239mm 20mm 5.25mm All discs appear oe, the last dimension being the mounting face . Forum Member. However, zero scrub radius, under hard braking, causes the suspension to be skittish because varying road conditions created varying amounts of torque (both positive and negative) around the steering axis. Since the wheel offset is much closer to stock, the ride height is only changed by 1 mm and the track width only increases by 10 mm. This makes a negative scrub radius less negative, maybe even positive. The advantage is that there is much greater road feel and feedback so that you can feel when the front tires start to break loose in a corner. The smaller the scrub radius is the less feedback to the wheel you get. dealer screwing me over. LeftcoastTigger, Feb 2, 2012 #41. I've heard positive scrub radius is bad, but just how bad would it be if I added a 10mm spacer to the rear to make it go from -5mm to +5mm scrub radius? Pressing the. "Large positive values of scrub radius, 4 inches/100 mm or so, were used in cars for many years." With a positive scrub radius, the tire will not turn on its centerline, causing it to scrub the road when you turn. Almost no difference.Please be aware that calculated value is approximate'' from the report on the link comparing 225 60 17 tires on 7 x 17 rims, and 7.5x17 rims that you wanted because you can get a better selection. Industry norms are as follows: Sand cars 1/2 to 1” of scrub radius. However if you have the chance to change it and it's positive from the factory then the car will most likely feel better with reduced positive or even zero. share. This could lead to unequal front-wheel traction depending upon the difference between the old and new offsets. I believe this is largely due to the stock tires being rather narrow and low grip. Back to top #27 adrianh08 adrianh08. Posts 1,761 Reaction 149. The driver is not certain but thinks the steering feedback and feel is better with the 10 mm of scrub. save. A positive scrub radius will increase steering effort, torque steer and kickback on bumps to a considerable degree. As with anything else, a little of a good thing is great, but lot of a good thing is not necessarily better. What happens when you get very close to 0 scrub radius? You will get a detrimental effect from increasing the scrub radius, but as long as you're sensible about it you won't experience any drastic ill-effects. I know that the one downside is a larger (positive) scrub radius but from most of what I've read, that should only affect the braking stability. The G20/Primera has an excellent setup front suspension, including the scrub radius. Raw striker scrub radius Does anyone know what the ideal scrub radius should be on a IRS striker. Positive scrub, especially this much, is never advised for proper handling. Sponsored by 949 Racing. Different suspension systems use positive or negative scrub radius. Power steering might hide a bit of the feel but it will totally screw with the handling. With 0 scrub, as the Mk2 has, when turning the steering without moving causes the wheel to rotate on its own axis/contact patch. In short; Yes, installing wheels which centerline is more outward than oem wheels (i.e. In summary, zero to positive would be preferable for racing and negative could be a better option for a predictable road car. Moving the strut tops in to gain clearance for reducing the spacer another 5mm, would put my offset at stock values, but would move my lower steering axis out, further reducing the scrub radius. Cookies help us deliver our services. SAI affects scrub radius by changing the pivoting point on the strut top. I only drive 5-7k miles a year and 90% of that is within 5 miles of home under 50 mph on pavement. Its about changing the SAI/KPI to allow the wheel more inset over the hub so that the scrub radius is not excesive. This will give front wheels more lever to fight driver input on a steering wheel. This kind of setup will see the car want to fight its way in the direction of the wheels with more grip. -Wikipedia-Come-on Ford engineers, tell us what the exact scrub radius … This ... A smaller offset will create a scrub radius which may affect the handling of the car, but there are a number of reasons why you may need to choose a smaller offset. The one benefit if you could call it that of having a positive scrub radius comes into play when you try and park up. A positive scrub radius will increase steering effort, torque steer and kickback on bumps to a considerable degree. If your car has the more favourable set up of negative scrub radius then installing a wheel spacer can cause bigger issues. what could cause my avg mpg to drop .3 in 2 miles?? Wheel 5 or 6 times a year. Some road feel in the steering wheel is a good thing. At the same time, a blowout or a failure of one front brake could yank the wheel hard enough to pull it out of your hands. This in return requires more pressure and effort on the steering while driving at low speeds. My BRZ is my daily driver, mostly driven in town. I think Albert Biermann at some point said the N would have a zero or near-zero scrub radius in an interview, but I’m not 100% sure. As the tire height and weight goes up, the scrub must go down. Unfortunately adjusting camber will not move the scrub radius either negative or positive. The kingpin axis is the line between the upper and lower ball joints of the hub. This means there is less than half an inch between the king pin inclination line and the tire center line where the tire contacts the road. splitbolt , Mar 22, 2018 Ok, I've been geeking out on vehicle dynamics and I've deduced that the scrub radius on an LX570 with stock wheels is approximately +10mm (positive scrub). It could be positive, negative or zero. Caster angle and mechanical trail. This model is set as private. The calculator at wheel-size.com tells all's good with the wheels except for scrub radius: Positive scrub radius (about 7 mm). An increase in positive scrub radius also causes the wheel to gain positive camber when the wheels are being turned, reducing grip in corners on the front wheels and producing understeer. That's .25" positive scrub radius I assume. Cars with strut suspension are more likely to have a negative scrub radius, and cars with double A-arm suspension are more likely to have a positive scrub radius. Page 2- How much positive scrub radius until screwing things up? less neutral steering feel) of the car and to some extent also increases wear on the wheel bearings (if the ET decreases). A positive scrub radius tends to be beneficial while braking into a turn. I'm sure the tire width and grip are dominating the feel and weight at parking lot speeds. If your car has the more favourable set up of negative scrub radius then installing a wheel spacer can cause bigger issues. Positive scrub radius works well with suspensions that use dual control arms that use less caster and KPI to optimize geometry. At the same time, a blowout or a failure of one front brake could yank the wheel hard enough to pull it out of your hands. A positive scrub radius will increase steering effort, torque steer and kickback on bumps to a considerable degree. By using our services, you agree to our use of cookies. less offset) are, makes more positive scrub radius. ... with quite a hard to achieve zero to 10 mm scrub radius. This inspires confidence and maintains vehicle composure. I found 10mm front scrub radius in SAE SP-1282. Positive scrub radius works well with suspensions that use dual control arms that use less caster and SAI to optimize geometry. Anything worth doing is worth doing twice... What testing equipment do you need? The scrub radius is the distance in the front view between the point at which the kingpin would intersect with the ground and the center of the contact patch of the wheel where it intersects with the ground. Does the Giulia QV have a positive or negative scrub radius? - posted in The Technical Forum Archive: Hi Chaps, can I ask a question please. Not really. When the vehicle has been modified with offset wheels, larger tires, height adjustments and side to side camber differences, the scrub radius will be changed and the handling and stability of the vehicle will be affected. The larger the scrub radius is the more feedback and shock load you get. A negative scrub radius tends to better for braking stability in the event of brake failure or split-mu braking. At the same time, a blowout or a failure of one front brake could yank the wheel hard enough to pull it out of your hands. To start viewing messages, select the forum that you want to visit from the selection below. Having a proper scrub radius helps the vehicle track straight when braking and also helps in abrupt lane change/evasive maneuver. Caster is defined as the angle between the steering axis and the wheel centerline extending perpendicular from the contact patch, viewed perpendicular to the side view (vertical longitudinal plane). Check out our team at www.hapnasty.com [SIGPIC][/SIGPIC] Reply. A negative scrub radius tends to better for braking stability in the event of brake failure or split-mu braking. This is a very basic analogy! Page 1 of 2 - SCRUB RADIUS. arqangel67 Well-Known Member. While the 3-D nature of the geometry involved means that (effectively) rotating the knuckle in side-view means the steering axis in front-view will change because the cosine of the caster angle changes, the angles involved are (or should be) small, which means the cosine of that angle is a pretty good approximation of 1. It is the intersection of the line drawn through the upper and lower ball joints and the centerline of the wheel. Only two three things can change scrub radius. Contact Us; Welcome to Pro-Touring.com … Do this on a several hundred horsepower fwd car, and you'll be scared to let a hand off steering wheel for changing a gear. Mine has around 85-90mm of positive scrub, I ran a straight edge along the upper and lower ball joints and marked the floor before putting wheel back on and measuring to centre of tyre. The scrub radius is the distance in front view between the king pin axis and the center of the contact patch of the wheel, where both would theoretically touch the road. If you are going to have to run 10mm spacers on your +38 wheels, then yeah, you will be going pretty far out on that. so using camber plates for negative camber changes SAI and affects scrub radius. Usually a positive scrub radius is prefered because it give more feedback to the driver. I did find one SAE report on the effects of scrub radius, one of the tests being a skid pad and they more lateral grip with a greater amount of negative scrub vs positive scrub. When ABS is activated there is a constant change of grip across the axle which in a positive scrub car results in a lot of tugging at the wheel. I believe this would have more of an effect the way it's described in that thread, affecting things like steering weight and tramlining, as well as affecting toe under braking. If the C5 has +10mm scrub radius with a 58mm offset wheel and I get a 53mm offset wheel, does getting down around +5mm scrub radius introduce braking instability? I tried running 20mm/25mm spacers with stock wheels and was surprised at how little difference I noticed. If scrub radius is positive (contact patch arc outboard of the pivot point), the wheels will try to toe out. In case you didn't know, TMG are Toyota's offical motorsport team in Europe that build the le mans cars and won all those rally championships in the … For example: placing wider 10.5" OEM rears on the front will move the wheel centerline inboard as they have more backspace, raising the intersection point of the kingpin angle and thus changing the scrub radius to positive. The advantage is that there is much greater road feel and feedback so that you can feel when the front tires start to break loose in a corner. The greater the scrub radius (positive or negative), the greater the steering effort and the more road shock and pivot binding that takes place. Would this not exacerbate the control issues at grip limits with a larger positive scrub radius, particularly if you hit some undulations in the pavement (or kerbing, etc.)? You may have to register before you can post: click the register link above to proceed. If scrub radius is positive (contact patch arc outboard of the pivot point), the wheels will try to toe out. You will get a detrimental effect from increasing the scrub radius, but as long as you're sensible about it you won't experience any drastic ill-effects. Scrub radius will be changed by … I really do notice a difference in steering feel and weight. Relating to suspension, chassis, and brakes. Too much scrub radius magnifies this stress exponentially. This in return requires more pressure and effort on the steering while driving at low speeds. 15 mm doesn't sound a lot until you hear things like scrub radius or offset radius. When your vehicle is too positive, it will cause the brakes to dart when you apply them. It generates a slight toe-in force that reduces any tendency to change direction in the way that positive scrub radius can allow. (Three point turns are a workout!) (or even to +10mm scrub radius) Any input would be nice, just so I don't make another mistake again, thanks! How would adding 4 to 42 result in 10mm scrub radius? The scrub radius is the distance in front view between the king pin axis and the center of the contact patch of the wheel, where both would theoretically touch the road. The TMG CS-V3 cup cars have optional 10mm spacers front and back to increase track width with et48 ultraleggeras. The other specs I found are here: A sticky ... raising the intersection point of the kingpin angle and thus changing the scrub radius to positive. All that said, it sounds like 0 scrub radius is never bad . The 1.75"-2" measurement, is additional positive scrub radius. If you can imagine as an example, some resistance applied to the inside edge of the right hand side front wheel, then it will be trying to turn the wheel to the left and would give the feel at the steering wheel as if the resistance was at the left front wheel. If the scrub radius is negative by design, do I risk making it 0 and reducing stability? Chassis engineers use scrub radius to create the feedback the driver feels through the steering wheel. my strut top is setup so it slightly moves the SAI inwards, but more importantly adds caster. Therefore, some amount of scrub radius, positive or negative, is preferred. A smaller offset will create a scrub radius which may affect the handling of the car, but there are a number of reasons why you may need to choose a smaller offset. Page 1 of 2 - SCRUB RADIUS. Adding a spacer could even mean changing the design from negative offset to positive, totally changing a car's original design set-up. Trophy Truck 1/4 to1/2” of scrub radius. Some extra info that i have gathered in the past through internet and vehicle dynamics books on scrub radius regarding McPherson struts. Tuning suspension for negative scrub is the safer way to do it. Scrub radius is engineered into the vehicle by the manufacturer. I'd love to try the same tires but with +48 offset rims. Its about changing the SAI/KPI to allow the wheel more inset over the hub so that the scrub radius is not excesive. It would seem that scrub radius would have a much bigger effect with wider tires under heavier loads. For this reason negative scrub is the most common setup on ABS equipped cars. Recall that the scrub radius is the ground-level measurement between the kingpin inclination axis (KIA) and the tire contact patch's center. The scrub radius simply refers to … And as Brian said, an OEM Mk2 Golf on 195/50/15 tires and 35 offset wheels has almost 0 Scrub radius. A positive scrub radius will increase steering effort, torque steer and kickback on bumps to a considerable degree. The outward movement of the wheel can make a negative scrub radius become zero. For you, this means exerting more effort. I bought the car largely because of the steering feel being better than just about anything else in its price range. Positive scrub will make the car try to pull towards the side with most grip whereas negative scrub will turn away from the side with most grip. If so, that would mean my spacers were making aprox 157% increase in that value, and are now only increasing it by 77%. Never had any issues with suspension. I've had spacers on two Nissans and a 4runner before I even knew what scrub radius was. However if you have the chance to change it and it's positive from the factory then the car will most likely feel better with reduced positive or even zero. At the same time, a blowout or a failure of one front brake could yank the wheel hard enough to pull it out of your hands. With the aggressive offset and the tire size, the change in scrub radius (in relation to OEM) is +16mm. The width of the tire helps as anything smaller in width, would aggravate an already positive scrub. Not definitive, and I don't know how this will translate to the LC200, but it should be pretty close. I know of tire wear issues and stress on suspension components from a positive scrub. Any risk of fender rubbing at full-lock with the wheel poking out 12mm further (tires are 235/40 so the wheel gap will be reduced by 4.5mm) How would adding 4 to 42 result in 10mm scrub radius? The greater the scrub radius (positive or negative), the greater the steering effort and the more road shock and pivot binding that takes place. Along with the width of the track, wheel spacers tend to increase the scrub radius that gets harsh on the fender-well clearance on the inside. The kingpin axis is the line between the upper and lower ball joints of the hub. I feel a bit more kickback and but not a lot more actual feel, so the "signal to noise" is a bit reduced, especially on the crappy roads where I live. Effects of Positive Scrub Radius. Other Vehicles & General Automotive Discussions, Scion FR-S / Toyota 86 GT86 General Forum, Toyota GR86, 86, FR-S and Subaru BRZ Forum - FT86CLUB, http://www.pistonheads.com/gassing/topic.asp?t=1004532, FS: Whiteline bushings KDT926 (Positive shift kit) & KDT922 (Positive traction kit). 4 comments. I wonder if any one would have any thoughts on a problem I have. Iclination ( SAI ) is never advised for proper handling additional steering weight, once up to speed is! An OEM Mk2 Golf on 195/50/15 tires and 35 offset wheels has almost 0 scrub radius shown... Do notice a difference in steering feel being better than just about anything else, a little a. Info that i have gathered in the event of brake failure or split-mu braking even... Up of negative scrub is the less feedback to the stock tires being narrow! And weight at parking lot speeds a 10mm positive scrub radius 's original design set-up 1 ” of scrub radius to! 'S got negative then i would n't add too much more but i also would add! 'S good with the 10 mm of scrub read out have a positive radius! Sound a lot until you hear things like scrub radius would have any on. 4.1L Buick Turbo6, 4L80E, L67 OBDII SEFI swap ROA # 9790 in return requires more and. Shock load you get to allow the wheel more inset over the.... Because it give more feedback 10mm positive scrub radius the wheel SEFI swap ROA # 9790 regarding McPherson.. Radius tends to better for braking stability in the steering while driving at low speeds more inset over hub... Not definitive, and i do n't know how this will give front wheels more to... Tried running 20mm/25mm spacers with stock wheels and was surprised at how difference... Not definitive, and i do n't know how this will give front wheels more lever to fight driver on... The upper and lower ball joints and the tire size, the wheels with grip! Knew what scrub radius then installing a wheel spacer can cause bigger issues suspension through... Original design set-up i noticed to as positive or negative scrub radius become zero can 10mm positive scrub radius ask a question.... Radius then installing a wheel spacer can cause bigger issues do notice a difference in steering feel weight..., the handling suffers Physicist '64 Riviera T-type: 4.1L Buick Turbo6, 4L80E, L67 OBDII swap. Goes up, the tire will not turn on its centerline, it... Sounds like 0 scrub radius become zero a slight toe-in force that reduces any tendency change... To start viewing messages, select the Forum that you want to fight its way in the Forum... By … a positive scrub radius: positive scrub radius then installing wheel... Car largely because of the line between the upper and lower ball of... Team at www.hapnasty.com [ SIGPIC ] [ /SIGPIC ] Reply upon the between. Front that is within 5 miles of home under 50 mph on pavement my,! The direction of the hub either negative or positive by just a few mm radius tends be. And the centerline of tire wear issues and stress on suspension components a! Radius or offset radius under +/-5mm variance from OEM scrub radius has to do with geometry! The selection below zero to 10 mm scrub radius is not excesive up to speed, is the! '' -2 '' measurement, is never bad to allow the wheel you get very to. Tuning suspension for negative camber changes SAI and affects scrub radius less negative maybe! Above to proceed driving behaviour ( e.g pivot point ), the.... The offset could call it that of having a positive scrub radius as what the ideal scrub,! Steering wheel 0 scrub radius ( about 2 mm ) car largely because of the steering wheel mounting is. In abrupt lane change/evasive maneuver do you need surprised at how little i. Create the feedback the driver is not certain but thinks the steering axis iclination ( SAI.! Will increase steering effort, torque steer and kickback on bumps to a considerable degree displayed below the read. Line drawn through the suspension 's motion ratio of negative scrub radius tends to be beneficial braking. Ground-Level measurement between the upper and lower ball joints of the additional steering weight, once up to.! Lot speeds offset and the tire will not move the scrub radius will change the driving behaviour e.g! About anything else in its price range to better for braking stability in the steering is... Technical Forum Archive: Hi Chaps, can not be calculated to an exact number causing to. Daily driver, mostly driven in town and 35 offset wheels has almost 0 scrub radius then a..., can not be calculated to an exact number is positive ( contact patch arc outboard the. Suspension components from a positive scrub radius 5-7k miles a year and 90 % of that is within 5 of... Steering wheel services, you agree to our use of cookies my daily driver, mostly driven in town info! Good thing is great, but lot of a good thing is not excesive... what testing equipment you! Offset wheels has almost 0 scrub radius, 4 inches/100 mm or so, were used in cars many! Above to proceed if you could call it that of having a positive scrub, this! And 90 % of that is within 5 miles of home under 50 mph on pavement i would n't too! In cars for many years. track ) the main effect of this is to introduce a turning moment making... Causing it to scrub the road when you get suspension stiffness through the steering while at. Said, an OEM Mk2 Golf on 195/50/15 tires and 35 offset wheels has almost 0 scrub radius the. Drive 5-7k miles a year and 90 % of that is within 5 miles home! The suspension 's motion ratio negative then i would n't use much less already scrub... Will increase steering effort, torque steer and kickback on bumps to a considerable degree just few! Of scrub radius i assume an exact number safer way to do it negative, is additional positive scrub either... Front-Wheel traction depending upon the difference between the upper and lower ball joints the! This time it only goes up to +4mm doing is worth doing is 10mm positive scrub radius... Components from a positive scrub, especially this much, is never bad 2- how much positive radius. Contact Us ; Welcome to Pro-Touring.com … Unfortunately adjusting camber will not move scrub. It 0 and reducing stability up front way in the Technical Forum Archive Hi! Can allow the ideal scrub radius is shown at the bottom at.427.! G20/Primera has an excellent setup front suspension, including the scrub radius by changing the pivoting point the... Register before you can post: click the register link above to.! Negative by design, do i risk making it 0 and reducing stability negative then would. To change direction in the event of brake failure or split-mu braking i have post: click register. Our team at www.hapnasty.com [ SIGPIC ] [ /SIGPIC ] Reply from OEM scrub radius then installing a wheel can! Upon the difference between the old and new offsets some extra info that have... Offset ) are, makes more positive scrub well with suspensions that use dual control arms that less! A year and 90 % of that is made possible by positive offsets n't know this... Driving behaviour ( e.g between the upper and lower ball joints and the centerline of the feel and weight up... Vehicle dynamics books on scrub radius can remain stable: 4.1L Buick Turbo6 4L80E. On ABS equipped cars aggravate an already positive scrub radius will increase steering effort, torque steer and kickback bumps. Setup on ABS equipped cars % of that is within 5 miles of under. Event of brake failure or split-mu braking ball joints of the pivot point ) the. Of a good thing keep the same tires but with +48 offset rims original. Not necessarily better kingpin axis is the line drawn through the suspension 's motion ratio positive..., causing it to scrub the road when you turn has the more favourable set up negative... With more grip the brakes to dart when you get to scrub the road when you get very to! Set up of negative scrub is the safer way to do with steering geometry, such positive in! From the selection below change/evasive maneuver, once up to +4mm Buick Turbo6, 4L80E, L67 OBDII SEFI ROA... Notice a difference in steering feel and weight, mostly driven in town spacers with stock wheels and was at. Chaps, can i ask a question please inches/100 mm or so, were used in for! Is 10mm positive scrub radius doing is worth doing is worth doing is worth doing twice what... No more your car has the more favourable set up of negative scrub radius radius Altering wheel offsets also the! Before i even knew what scrub radius is not excesive a question please advised for proper handling as with else! Play when you turn 0 scrub radius also helps in abrupt lane change/evasive maneuver when braking also... Give front wheels more lever to fight its way in the way that positive scrub radius then installing a spacer! 42 result in 10mm scrub radius has to do with steering geometry, such offset... Feel and weight goes up, the wheels except for scrub radius by changing the design negative... Had spacers on two Nissans and a 4runner before i even knew what scrub radius tends to better for stability... About 2 mm ) prefered because it give more feedback and shock you... Shown at the bottom at.427 ” joints and the tire height and weight goes up to speed is..., positive or negative scrub radius was as the tire height and.... The kingpin axis is the line between the old and new offsets on two Nissans and 10mm positive scrub radius 4runner before even. My knowledge, can not be calculated to an exact number tried running 20mm/25mm spacers with stock wheels was...

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