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When you drive on rough pavement, this is what happens to your front tires with IFS. When a tire hits a bump or a rut, road surface applies a force to the tire-contact patch. Scrub radius (see glossary for definition) acts as leverage and turns this force into torque, which will try to swivel the tire around. As soon as the tire goes back on a flat surface, the force (therefore the torque) diminishes, and caster trail will rotate the tire into the straight-ahead position and maintain it until it hits another road irregularity. This cycle can be felt as kick-back through the steering wheel and can be decreased by reducing the scrub radius on your rod by using positive-offset wheels (like a new car). View Related Article
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