Carbon Steel Frame: This road bike is built with a premium carbon steel frame and carbon steel front fork, ensuring enhanced comfort and stability during rides. It comes with 700x25C wheels and high-quality tires, delivering an excellent high-speed road cycling experience, making it ideal for urban commuting 21 Speeds Gear System: This road bike for men features a Shimano drivetrain with a 21-speed (3x7) gear system, working seamlessly with front and rear derailleurs to provide smooth gear shifting, energy efficiency, and acceleration. Whether you're climbing steep hills or cruising downhill, switching gears is effortless Exceptional Braking System: This racing bike features a powerful caliper braking system that delivers quick response and precise control during rides. It ensures secure downhill and wet condition cycling, giving you confidence and control on the road Comfortable Riding Experience: This road commuter bike features an internal cable routing design, neatly tucking cables inside the frame for enhanced security and a smoother riding experience. The drop-bar design allows for an aerodynamic riding position, reducing wind drag for more efficient cycling Easy Assembly: This road bicycle comes 85% pre-assembled with essential tools included. Simply install the front wheel, saddle, pedals, front brake, and reflectors for quick and effortless setup. Its product dimension is 67 x 18 x 37 inch (1710 x 448 x 940 mm) The bike comes 85% pre-assembled: 1. Please assemble the handlebar, saddle, front wheel, pedals and refelctors. 2. Before assembling the handlebar and front wheel, please rotate the front fork 180° ！！ 3. Please check the L/R markings on the pedals before assembling.