Features1High Efficiency: Stable and durable, high efficiency and good sound transmission. Whether you're riding on the street or off road, you can be passionate! 2Upgrade Features: Lubricating 4 bearing, 72 ring high density transmission, aluminum freewheel base, CNC body. Superior performance. 24 front and 24 rear, straight pull spokes. 3Refined Workmanship: Accuracy machining, low friction, strong sealing, can effectively isolate water, mud and dirt, and achieve a fluent and fast riding experience. 4Aluminum Alloy Material: The road bike hub is made of aluminum alloy material, with high strength, no rust, no deformation, and durability. 5Compatibility: This aluminum alloy road bike hub is suitable for use with 8 to 12 speed cassettes. Brakes are installed by locking the disc with a center lock.SpecificationItem Type: Mountain Bike HubMaterial: Aluminum alloyGross Weight: 400g / 14.1ozSpoke Holes: 24 front and 24 rearSpokes: Straight SpokesSize: 14GFreewheel: 6 claws, 72 ringsSealed Bearings: Taiwan Bearing Front 2 Rear 4Axle: 12x100mm thru axle; 12x142mm thru axleBrake Installation: Lock the disc with the center lockSuitable for: 8-12 speed cassettePackage List2 xBike Hub