What Is the Tyre Shoulder?

The shoulder is the area where the main tread surface curves down towards the sidewall. It forms the outer edge of the tread and has to cope with cornering forces, heat and repeated flexing as the tyre rolls.

Why Is the Shoulder Important?

The shoulder helps support the tyre during cornering and contributes to the transition between the tread and sidewall. Its design varies between tyres depending on their intended use, handling characteristics and tread pattern.

What Causes Shoulder Wear?

Wear concentrated on one shoulder can be associated with wheel-alignment problems, suspension condition or driving conditions. Wear on both outer shoulders can also be associated with prolonged underinflation. The whole tyre should be inspected rather than assuming one cause from the wear pattern alone.

Can Shoulder Damage Be Repaired?

Puncture repairability depends on the exact location and type of damage. Damage close to the shoulder or sidewall is commonly outside the normal repairable tread area because this part of the tyre flexes heavily. A tyre professional should inspect it before any repair decision is made.

What Should You Look For?

• Cuts, cracking or exposed cords.
• Bulges or distortion.
• Uneven shoulder wear.
• Objects embedded near the edge of the tread.