Key benefits Restores smooth, responsive steering and precise control for road and mountain bikes. Durable, heavymetal construction designed to withstand demanding riding conditions and reduce premature wear. Precisely machined bearing surfaces deliver lowfriction rotation, lowering steering effort for a more controlled ride. What these bearings do Provide consistent, secure rotation to improve handling and reduce play in the headset. Engineered to perform reliably in variable weather and everyday use. Compatibility and sizes Available to match common headset/frame dimensions: 38mm, 39mm, 41mm, 41.8mm, 46.9mm, and 52mm. Suitable for a wide range of road and mountain bike models. Always confirm your bike's headset specifications and measurements before to ensure correct fit. Materials and performance grade metal construction for long life under load. Precision machining minimizes friction and noise while maximizing steering responsiveness. Built to resist the stresses of rough terrain and frequent use. Practical replacement uses worn headset bearings on a commuter bike to restore smooth steering and reduce wrist fatigue during urban rides. Upgrade headset bearings on a mountain bike to maintain precise control on technical trails and in variable conditions. Service a road bike to eliminate play and improve handling for training or group rides. Notes for buyers Verify your frame's headset dimensions and bearing type before ordering. Compatible with many models, but correct sizing is essential for safe installation and performance.