1.5 Inch Bike Headset Washer Bicycle 1 1/8 Headset Base Spacer Crown Race 28.6mm 39.8mm Tapered Fork Straight Fork 45 Degree

Product Name: Front Fork Bottom Bracket, Bottom BracketMaterial: Open bottom rail = aluminum alloy, Fixed bottom rail = steelColor: BlackWeight: 30.0mm, opening, bottom weight 4g39.8mm opening with a 5.8g base weightFixed bottom weight 12gSpecification: Open-type lower guard/Fixed-type lower guardApplication: Applicable to 28.6mm standard straight tube mountain bike forks and universal forks for road bikes.Opening shape: suitable for bearing type and sealed type bearing sets.Advantages: This repair part is very practical for cyclists who may encounter a gap between the front fork and the head tube of the frame due to the lack of a lower stopper during an upgrade, which can cause the head of the bicycle to loosen when riding!