Tyre wear diagnosis An over-inflated tyre usually wears the tread most near the __________.

Difficulty: Easy

Correct Answer: centre

Explanation:

Introduction / Context:Interpreting tyre wear patterns helps diagnose inflation, alignment, and suspension issues. Over- and under-inflation produce characteristic patterns on the tread surface.

Given Data / Assumptions:

  • Radial passenger car tyre, typical load conditions.
  • No severe alignment faults assumed (camber/toe).

Concept / Approach:Inflation pressure changes the contact patch shape. Over-inflation bulges the center of the tread outward, concentrating load and friction there. Under-inflation lets the shoulders carry more load, wearing edges faster.

Step-by-Step Solution:

Consider how pressure affects contact patch curvature.Over-inflated: crown rides high → center wear accelerates.Under-inflated: shoulders bear load → edge wear pattern.

Verification / Alternative check:Tyre service manuals show cross-sectional load distribution diagrams correlating pressure with wear patterns.

Why Other Options Are Wrong:

  • Edges/corners: typical of under-inflation or excessive camber.
  • Random wear: indicates other faults such as shocks or balance, not classic pressure effect.

Common Pitfalls:Misdiagnosing center wear as camber issue; ignoring that temperature and speed exacerbate pressure-related wear.

Final Answer:

centre

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