This bike has a high quality ultralight aluminum frame and an inner wire designThe brake system consists of double Caliper brakes. And SHIMANO 3*7-speed Shifters ensures total control in every situation.The bike can be used to ride comfortably in the city.The 700C wheels offer the high-speed experience of a road bike.85% pre-assembled,easy to assemble,free installation tools and pedals include.Size 49 cm for people between 5'3" & 5'6"