Scrub radius affects the tire’s tendency to change the dynamic toe angle during braking and acceleration. The effect of positive or negative scrub radius on the toe angle will depend on whether the vehicle is a front-wheel or rear-wheel-drive design.
Is positive scrub radius good?
When you brake and your effort is greater on one side of the car than the other, a positive scrub radius will make the car turn to the side where effort is greater. You’ll find that a positive scrub radius is useful with certain racing setups. It’s also a standard setting with many double-wishbone suspension designs.
Does scrub radius matter?
A larger scrub radius amplifies the toe-in affect, which might actually reduce stopping distance just a bit, but only if he driver can hold the steering wheel straight. On a rear-drive car, acceleration and braking forces both have the same effect on the front wheels.
Is positive or negative scrub radius better?
Negative scrub radius decreases torque steer and improves stability in the event of brake failure. SLA suspensions usually have a positive scrub radius. With this suspension, the scrub radius is not adjustable. The greater the scrub radius (positive or negative), the less the steering effort is.
Do wheel spacers affect scrub radius?
That said, wheel spacers affect suspension geometry, and will change the scrub radius, affecting braking stability, and also reduce the effective spring rate at the wheels. Wheel spacers can also cause wheel bearing failure.
How can I reduce my scrub radius?
Push those wheels out with spacers or install fully adjustable coilovers, for example, and the radius can become positive. That forces the tyre to ‘scrub’ the ground as it turns in its arc, adding a different kind of wear and reducing its life.
Will spacers help scrubbing?
Fitting a wheel spacer will increase the positive scrub radius at the front wheels which has some unfavourable consequences. If your car already has a bit of positive scrub radius then the wheel spacer will increase it.
Are 2 inch wheel spacers safe?
If you installed them properly, 2-inch wheel spacers are exactly very safe to use and will not cause any vibration. It is recommended to get your wheel spacers installed at a reputable wheel shop. To ensure safety, the lug nuts need to be torqued properly.
Do spacers lower mpg?
Spacers should make little to no difference (Unless they are something silly like 50mm+). With the air boundary layer and turbulent air generated by the rotation of the wheel, sticking out a bit will have negligible effect on mpg.
