Product Information Bike Type mountian bike Age Range Description fits height 5'3"-5'9" (162-180cm) Frame Material Type Carbon Steel Handlebar Type Flat Handlebar Bike Shift Levers Shifter Lever with Gear Indicator Suspension Type Front Brake Style Disc Speeds 21 speeds Rim Material aluminum alloy Included Components toolkits，Assembly Instructions，reflector Wheel Size 27.5 *2.125 Frame dimensions (seat tube clamp to wheel center axis length) 17.5 inch load-bearing 250lb Tire Type Clincher【Sturdy High Carbon Steel Frame for Durability】This mountain bike is constructed with a high carbon steel frame, ensuring long-lasting strength and durability to handle tough terrains and daily commuting.【Reliable Disc Brakes for Safe and Precise Stopping】Equipped with powerful disc brakes, this bike provides consistent, responsive braking for a safer ride, whether you're commuting through the city or enjoying a weekend adventure.【Stylish Brown Edge Tires for Enhanced Design】Featuring distinctive brown edge tires, this bike combines style and functionality, providing excellent traction while adding a unique touch to its appearance.【Built to Withstand Daily Use】With its durable construction and stylish design, this mountain bike is ready to handle the demands of daily use, whether you're riding on city streets or exploring outdoor trails.【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.