Brand: ARC Material: Aluminum Alloy O.L.D.: Front 15x110mm Rear 12x148mm Weight: 395g/set Bearings: Front 2 Bearings; Rear 4 Bearings Structure: 54T Ratchet Freehub body: HG 8 9 10 11 SPEED/ MS 12 SPEED/ SRAM XD 12 SPEED Use for: Mountain Bike