Provides a stronger, faster, more reliable stopping power than the traditional V-Brake Systems. It takes less energy to keep the bike at speed. Shimano 21-speed shifter combo with brake lever provides quick gear changes. The geometry of the frame is designed with professional competition grade geometry, more ergonomic. The bicycle is 85% assembled, you just need to install the front fork, front wheel, seat and pedal. Comfortable seat and handle? Adjustable foam Sseat:;You can adjust the seat according to your height.