1.Size:52CM 2:Frame:Chrome molybdenum steel frame 3.Fork:Chrome molybdenum steel 4.Crankset:48T 170mm aluminum alloy crank 5.Seatpost:27.2mm 6.Stem:25.4MM Aluminum Alloy 7.Handlebar:25.4MM Aluminum Alloy Drop Bar 8.Chain: KMC 1/2"*1/8" 9.Pedal:Taiwan Giccok Aluminum Alloy 10.Tire:compass 700*23C 11.Tube:KENDA 60L 12.Headset:34mm qinghao 13.Saddle:Legend racing 14.Brake: radius Taiwan V-brakes 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.