Feature●Bike Wheel Part Bicycle hub Bike Hubs 36 Hole, Quick Release,Alum,One Pair,100mm*135mm Front Width and Rear Width●Braking: Front Disc brake and Rear Disc brake, compatible with the ball bearing.●Compatible with rotary flywheel 21/24 Speed●Material and Surface: Alum and Chromed●Package: front hub and rear hub and quick release as wellDescription