Features1High-strength aluminum alloy with CNC processing. 2Front 2 and rear 4 high-precision bearings for low friction and strong sealing. 336 holes, 120 clicks. 4Front: 100*9mm/100*15mm; Rear: 135*10mm/142*12mm. 5Fits 6-bolt disc brakes, compatible with 7-12 speed cassette freewheels.SpecificationFeatures:High-strength aluminum alloy with CNC processing.Front 2 and rear 4 high-precision bearings for low friction and strong sealing.36 holes, 120 clicks.Front: 100*9mm/100*15mm; Rear: 135*10mm/142*12mm.Fits 6-bolt disc brakes, compatible with 7-12 speed cassette freewheels.Specifications:Material: Aluminum alloyColor: Black / Red / Colorful (optional)Clicks: 120Type: mountain bike, 6 nailsHoles: 36 holesSealed bearing: front 2 and rear 4Compatible Freehub: 7-12 speed cassette cogsTooth Density: 6 pawlsBrake Type: disc brakeFront: 100*9mm/100*15mmRear: 135*10mm/142*12mmEnd Cap:9mm / 10mm quick release15mm / 12mm thru alxeWeight: Quick release: approx. 590g; Thru axle: approx. 485gPackage List:1 * Front Hub1 * Rear Hub2 * Quick Release4 * End CapPackage List1 * Front Hub1 * Rear Hub2 * Quick Release4 * End Cap