1PCS Bike Headset Bearing 40/37/30.15/34.1 mm Steel Bearings | Waterproof & Durable for MTB/Road Bicycle Steering Repair

Bicycle headset bearings are a type of ball bearing primarily used in the head tube and fork
steerer area of mountain bikes, road bikes, and other bicycles—commonly referred to as the 'headset.' Their core function is to connect the frame and the fork,ensuring smooth and precise steering.