29 Inch Mountain Bike, 21 Speed Bicycle Steel Frame MTB Front Suspension Disc Brake Bicycle Men or Women Lightweight MTB for Adult Student Product introduction: [High performance and high quality]: Lightweight and sturdy high carbon steel frame and high-quality front fork, with comfortable shock absorption performance, bringing smooth cruising and relaxing riding experience. [21 SPEED]: 21 Speed Shifting system MTB Bicycles specifically designed for Adult and Student, you can easily choose any speed,so you can easily go on the road. [Suitable for the Crowd]: Lightweight, durable, and portable. The streamlined frame was designed to suit students, office workers, both men or women, in an urban environments for commuting to and from work. [Super big tires]: Oversized 29-inch tires provide extra grip and stability on roads or small roads. [Great Braking System]: Double disc brakes give you a stable and strong braking force to help keep the cyclist safe even at high speeds down sloppy terrains; the front suspension makes riding more comfortable. [Note] 85% of the bike has been installed coming out of the box, you are only required to install pedals, front wheels, handlebars, seats and fill up the tires. If you need installation video and help, please contact us immediately, and we will get back to you within 24 hours. Accessories introduction: F/derailleur: TZ-30 R/derailleur:  TZ-500 Shifter: TZ-51-7 Freewheel: 7 tower wheels Frame/Fork: Steel suspension frame and fork Handlebar/Handlebar: Straight handle, four-screw alloy rod Brake/Brake lever: Double aluminum disc brake/Mountain bike brake level Tires: spoke wheel Rim: Aluminum alloy rim Brake: Cable pull disc brake Saddle: Mountain bike saddle Pedal: non-slip resin pedal Double 160mm disc brakes Front suspension Adjustable saddle Product parameters: Color: White Tire size: 29 inches Gross weight: 21KG/46LB Net weight: 18KG/40LB Product packaging size: 146x72x20cm/58x28.8x8in Handlebar height from the ground: 105cm/42in Body length: 180cm/72in Height of seat cushion from the ground: 85-105cm/34-42in Applicable height: 165-195cm/66-78in Products include: 1x Mountain bike 1x English manual 1x Toolkit