The bike include double V brakes and 17T fixedgear,16T freewheel. The bike frame have 3 colors,if you need change color of the frame,please leave a message to us. 1.Size:52CM 2:Frame:6061-T6 Aluminum Alloy 3.Fork:Aluminum Alloy 4.Crankset:48T 170mm aluminum alloy crank 5.Seatpost:27.2mm 6.Stem:31.8MM Aluminum Alloy 7.Handlebar:31.8MM Aluminum Alloy Drop Bar 8.Chain: Italy MICHE or SHIMANO Olive chain 9.Pedal:Taiwan Giccok Aluminum Alloy 10.Tire:kenda 700*23C 11.Tube:KENDA 60L 12.Headset:44mm qinghao 13.Saddle:Legend racing 14.Brake: radius Taiwan V-brake 15.Gear Ratio:16T Freewheel+ 15 or 17T Fixedgear Dear customer, Thanks for your attention to our bike. Because this bike is also selling on other platform . So the real-time in stock can't be control and shows accurate. It might cause our customer very confuse and sometimes , customer bought ,but actually , that size/color sold out. Enjoy riding. Best regards. Feel free to contact us anytime if have any other question.We will reply as soon as we see the message.