ASE A4 Suspension and SteeringWheels and Tires Diagnosis and RepairEasy
A customer complains of excessive road noise and poor handling. Upon inspection, a technician observes that the inner and outer edges of the front tires are significantly more worn than the center tread. Which of the following is the MOST likely cause of this tire wear pattern?
- AOverinflation
- BUnderinflation
- CExcessive positive camber
- DExcessive negative camber
Show answer & explanationAnswer & explanation
Correct answer: B. Underinflation
Underinflation causes the tire's shoulders (inner and outer edges) to bear more of the vehicle's weight, leading to increased wear on those areas. The center of the tread crown will be slightly lifted and wear less.
Why the other options are wrong
- A. Overinflation causes the center of the tire tread to bulge and wear excessively, not the edges.
- C. Excessive positive camber causes wear on the outer edge of the tire only.
- D. Excessive negative camber causes wear on the inner edge of the tire only.
Underinflation Tire Wear
When a tire is underinflated, its shoulders (inner and outer edges) bear the majority of the load, causing accelerated wear on these areas.
- Causes wear on both inner and outer edges of the tread.
- Reduces tire's contact patch.
- Increases rolling resistance and fuel consumption.
Memory trick: Under Pressure, the Edges Crumble First.