Product Information Bike Type mountian bike Age Range Description 5'2"-5'7" (160-175cm) Frame Material Type Carbon Steel Handlebar Type Flat Handlebar Bike Shift Levers Shifter Lever with Gear Indicator Suspension Type Dual Brake Style Disc Speeds 21 speeds Rim Material aluminum alloy Included Components toolkits，Assembly Instructions，reflector Wheel Size 26x2.125 Frame dimensions (seat tube clamp to wheel center axis length) 17 inch load-bearing 250lb Tire Type Clincher【Front and Rear Dual Shock Absorption System】Equipped with both front fork and rear shock absorbers, effectively reducing road vibrations and enhancing riding comfort, suitable for various terrains.【Efficient 21-Speed Gear System】The 21-speed gear system allows riders to easily adjust the speed for different terrains and needs, improving the overall riding experience.【Sturdy and Durable Design】Built with a high-strength steel frame, ensuring stability and durability on various terrains, perfect for long-term use.【Reliable Disc Brake System】Features a disc brake system that provides strong braking performance, ensuring safety under various weather and terrain conditions.【85% Pre-Assembled】The bike comes 85% pre-assembled. You need to assemble the handlebar, saddle, front wheel and pedals. After a short adjustment of the brakes and gears you can start riding immediately. Please note that if you have any questions, you could contact our customer service first.