mountain bikes are a smart choice for the strong and serious rider looking for a high-quality mountain bike with advanced features without overpaying. This well-equipped mountain bike is built with a lightweight carbon steel frame, 21-speed drivetrain with shifters, and dual-pivot side-pull brakes for powerful and safe stops. It can cope with complex road conditions and weather such as flat roads, up and down slopes, dirt roads, and wind. Specification Color:orange/green Maximum loading weight: 330 lbs/150 kg. Braking system: double Disc-brake. Speed: 21-speed shifter. Gear Size: 42T. The distance from the handlebar to the seat :90mm. Brake type :Dual disc brakes Frame : 17.5inch carbon steel frame. Tires :27.5 * 1.95 tires. Package included: 1 x folding bike. Installation tool. NOTE: This bike arrives 85% assembled. You need to assemble the front wheel, pedals, handlebars, seat and inflate the tires. 1. Pedal assembly instructions: The L marked pedal should be screwed into the left crank arm (clockwise to remove, counterclockwise to install). The R mark pedal should screw into the right crank arm (counterclockwise to remove, clockwise to install). Finally, use a wrench to tighten both pedals as completely as possible. 2. Please confirm the front brake on the left side of the bicycle. Because if you assemble the front brake on the right side of the bike, the bike gears and braking system won't work. Also, the pedals hit the front tires. After-sales service: All products are guaranteed in quality, please rest assured to buy. If there is any problem with the product, please contact us directly for assistance.