SMOOTH BEARINGS: Sealed bearing is smooth, durable. Gasket design prevent the water, dust or sand from entering to the bike pedals to avoid the noise. In addition, the outer surface of the bearing in the middle is also protected by aluminum alloy. International standard 9/16 inch screw thread fits for most bikes.
LIFETIME WARRANTY: ROCK BROS ensures you a risk-free purchase! We offer you a full money back with any questions. You can receive your full money back if our product does not live up to your expectations. Your satisfaction is our highest priority.