SOS Mechanic Certification – Suspension & Steering Practice Exam

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What could cause excessive wear on the outer edge of a tire?

Too much positive camber

Too much negative camber

Excessive wear on the outer edge of a tire is typically attributed to too much negative camber. Negative camber refers to the angle of the tires when they are tilted inward at the top. When a vehicle has too much negative camber, the tire's outer edge makes more contact with the road, which can lead to accelerated wear in that area. This uneven contact puts increased pressure on the outer edge, causing it to wear out faster compared to the inner edge.

In a well-aligned suspension, the camber angles should allow for even tire wear, but an excessive negative camber angle disrupts this balance. Understanding this dynamic can help technicians diagnose and correct alignment issues, ultimately improving tire life and vehicle handling.

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Incorrect toe alignment

Under-inflation of tires

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