Color: White Size: Medium (54cm) Strong and Lightweight 6061 Aluminum Frame. Shimano 21 speed A050 shifter and derailleur. Adjustable handlebar and seat post for comfortable riding styles. Includes free water bottle and bottle holder. Recommended height: 5"4"-6"0" Assembly required, easy to assemble. Packing: SKD 85% factory assembled. SPECIFICATIONS: Color: White Size: Medium (54cm), Recommended height: 5"4"-6"0" Frame: 700Cx21", Alloy 6061, Top Tube / Seat Tube / Down Tube: 31.8x31.8x42mm Fork: 700CC, Steel, Comfortable Bike Fork Handle Bar: 22.2mm, W: 420mm Handle Stem: Ext:80, 22.2x180 Chain Wheel: 1/2"x3/32"x28x38x48Tx170mm Front Derailleur: TZ31, 31.8mm Pull Down (Shimano) Rear Derailleur: A050 (Shimano) Derailleur Shifter : A050 SIS Handlebar Mounted, Non-Index (Shimano) Freewheel: MF-TZ07, 7 speed 14-28T (Shimano) Chain: 1/2"x 3/32"x 110L Brake: AS-2.4D, Alloy Caliper Brake, Adjustable Brake Levers: RA3.2A, Alloy Brake Cable: F: 430x700mm, R: 520x220x 1250mm Rim: HS-14, Alloy, 14Gx36H, Size: 700Cx1.5 A/V, Double Wall Rim Front Hub: AE-241F, Alloy, 14Gx36H"3/8"x100x140mm, Loose Ball Rear Hub: AE-241R, Alloy, 14Gx36H"3/8"x126x165mm, Loose Ball Tire: IA-2304, Rubbber, 700Cx25C Saddle: PVC fake leather Seat Post: JB-SP-300, Alloy, 27.2x250x1.4T Seat Post Clamp: Alloy 31.8mm Pedals: YH-44X, Alloy 9/16" with ball Spoke: 13G Lengh: F/295, R/295/292, with steel cap. Kickstand: Not included Weight: 25 lbs