We know bumps may get in the way of your commute, our GR-150 has a blend of wider tyres and comfortable geometry to give you the ultimate adventure bike. Adapt to any terrain with the versatility of the GR-150. Specifications Frame Sizes: 50cm Frame: Alloy 700c Road Frame with Alloy Forks Handlebars: Alloy Road style Handlebars, W:420mm Shifters: Shimano 14-Speed Tourney Dual Control SIS 2 x 7 Speed Levers Derailleur: Shimano Tourney (Front) FD-A050 & Shimano: Tourney (Rear) RD-A070 Saddle: Cionlli Road Saddle with ED Rail Pedals: Steel / PP (9/16") Brakes: POWER Front & Rear Disc Brakes Brake Levers: POWER Alloy Brake Levers Spokes: 14G Freewheel: Shimano Tourney MF-TZ500-7, 14-28T 7SP Index Chainwheel: Prowheel Steel (34/50T�170L 7 Speed) Chain: 1/2"�3/32"�112L Headset Steel: (�28.6��34��30mm H=22.7 10 PCS) Front Hub: Steel (14G�36H 3/8"x100�140mm) Rear Hub: Steel (14G�36H 3/8"�135x180mm 7 Speed) Bell: Alloy/Plastic Tyre: Road H-441(700C�35C) Rim: Alloy, CNC Sidewall (700C�14G�36H F/V)