Yamaha Upper Steering Cone XSR 155/MT15/R15

The Yamaha Upper Steering Cone is a key part of the steering head assembly on a motorcycle. It sits at the top of the steering stem and works with the lower cone and bearing to support the steering linkage and front forks. By providing a smooth, precisely machined seat for the upper steering bearing, it helps the steering operate smoothly and reliably.

This cone ensures that the steering stem is properly aligned and that the bearing maintains correct preload — preventing wobble, looseness, or uneven steering feel. A well-installed upper steering cone contributes to stable handling, precise steering input, and consistent front‑end geometry.

Over time, wear or damage to the upper cone (or its bearing seat) can lead to rough steering action, slack or play in the steering, uneven tyre contact, or poor handling. Replacing a worn or damaged upper steering cone restores steering accuracy, ensures proper bearing support, and helps maintain safe riding dynamics.