Features1 Aluminum Alloy Construction: Crafted from aluminum alloy, the quick release cycle hub is engineered for strength and durability, making it a good choice for mountain cycle. This robust material ensures high performance under tough riding conditions, providing riders with the confidence they need on rugged terrains. 2Enhanced Braking Performance: Equipped with a 32 holes design, this mountain cycle rear and front hub offers superior braking performance, allowing for responsive and good stops. Riders will enjoy a smoother and more controlled riding experience, essential for navigating challenging trails and steep descents. 3Convenient Quick Release Design: The front and rear hubs feature a 100mm and 135mm quick release design, respectively. This innovative feature allows for effortless installation and removal, making it easy to service or replace cycle components, especially in the field during mountain biking trips. 4Good Compatibility: This mountain cycle bearing hub is versatile and compatible with 8, 9, 10, 11, and 12 speed gear systems, catering to a wide range of cycling needs. Whether you are a casual rider or an advanced cyclist, this hub can accommodate varying gear setups, ensuring an optimal riding experience. 5Double Ball Bearings: The road cycle front rear hub's design includes two ball bearings that facilitate slick and long lasting operating. This feature not only enhances the cycle's overall performance but also ensures a safe and comfortable ride. The reduction in friction across the components translates into improved efficiency and longevity of the hub's functioning.SpecificationItem Type: Mountain Cycle Bearing HubMaterial: Aluminum Alloy Spoke Hole Count: 32 Holes Front Hub Size: Front: Approx. 100mm / 3.94in, Rear: Approx. 135mm / 5.31inEar Spacing: Approx. 53mm / 2.09inAxle Diameter: Approx. 9.5mm / 0.37inHub Structure: Front 2 Hub, Rear 2 Hub 36 SoundsCompatibility: Mountain CyclePackage List2 x Mountain Cycle Front and Rear Hubs2 x Quick Release Levers