Front tires that are larger than specified may change the scrub radius from positive to negative.

Question

Quizplus · Accepted Answer

When front tires are larger than specified, the distance between the tire's steering axis and the tire's contact point with the road can change. If this distance is reduced to a point where it is less than the kingpin inclination, then the scrub radius becomes negative. This can cause handling and steering issues.

Front Tires That Are Larger Than Specified May Change the Scrub