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What happens when you increase wheel offset?
Too much positive offset (the wheel sits too far in towards the car) can cause damage to inner suspension and brake components from the inside lip. This can lead to poor handling making the car unstable at speed. Sometimes the rubbing will happen on the inner sidewall of the tire causing a rupture of the tire.
Is it bad to change wheel offset?
However, it is important to get it right, because getting the offset wrong risks badly damaging the replacement wheels and tires as well as suspension components, and can put the driver at serious risk of a blowout.
Do wheel spacers change scrub radius?
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. The outward movement of the wheel can make a negative scrub radius become zero.
Which is better negative or positive scrub radius?
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 ride quality?
A wheel offset or spacer won’t affect ride quality… The additional unsprung weight and adding length to the distance between the frame and wheel without changing control arms and shocks will impact ride quality.
Is negative scrub radius bad?
For high-speed stability in the presence of road disturbances, zero or slight negative scrub radius is desirable (negative is outside the wheel center plane) Braking forces introduce steer torques proportional to the scrub radius.
Which scrub radius is best?
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. Therefore, some amount of scrub radius, positive or negative, is preferred.
Do wheel spacers throw off alignment?
DO wheel spacers AFFECT alignment? Fixed. Unless you mess with lowering, camber, or caster, adding spacers to widen your wheel stance will not need you to get an alignment. you are just pushing the wheels out more.
What happens when you change the scrub radius of a tire?
Assuming that either tire/fender interference is not a problem, or has been resolved, changing the offset of a wheel will change the scrub radius of the tire/wheel combination. Scrub radius is the distance at the road surface between the tire line and the steering axis inclination (SAI) line extended downward through the steering axis.
Can you change the scrub radius on a FWD car?
The scrub radius specification for most FWD vehicles is typically negative. Installing a smaller diameter tire or installing wheels that move the wheel offset away from the hub face will decrease the amount of negative scrub radius. In extreme cases, this could cause the scrub radius to change from negative to positive.
What can I do to increase my scrub radius?
Installing a smaller-size front tire on a RWD vehicle with a positive scrub radius will increase the scrub radius. Installing a wider wheel, or a wheel with a different offset, will move the tire centerline away from the vehicle, also increasing positive scrub radius.
How does wheel offset affect the steering radius?
A significant reduction in positive offset of the wheels will EFFECTIVELY change the steering geometry’s scrub radius, possibly increasing the steering effort and making the car harder to control during turning and cornering.