Frame: 6061 Alloy. Fork: Hi-Ten Steel With Chromoly Legs. Handlebar: 2 Piece Hi-Ten Steel 8" X 28.5". Grips: Velo Mushroom 140mm. Stem: Framed Alloy Top Load. Headset: Standard 1 1/8" Loose Ball Unsealed. Brake Lever: Avid Alloy Lever. Rear Brake: Avid BB5 disc; 160mm rotor. Front Brake: N/A. Crank: 3 Piece Forged Steel 175mm. Crank Spindle: 19mm, 8 Spline Spindle. Bottom Bracket: Euro Sealed 68mm. Chain: KMC Z410. Chain Ring: 32 Tooth Alloy. Rear Free Wheel: 16 Tooth Freewheel. Front Hub: Alloy 36H Sealed 3/8" Axle. Rear Hub: Alloy 36H Sealed 3/8" Axle. Rims: Alloy Double Wall 36 Hole. Tires: 27.5" X 2.1". Saddle: Suede Bmx Style, Steel Rail. Seat Post: 27.2mm X 300mm Alloy Post. Clamp: Alloy 31.8mm. Pedals: Wellgo Composite. Note: All bikes are sold and delivered partially assembled. Final assembly should be done by a certified bike technician. Failure to have the bike assembled by a certified bike technician may void the warranty and could result in damage and/or injury if not assembled correctly.