Adjustable Saddle Height:Its saddle can be adjusted between 80-95cm/ 31.5-37.4in, so you can adjust the height according to your comfort. | Precision Shifting:It has a precision shifting front and rear chainstay that gives you precise shifting for different terrain. The precision 21-speed mountain bike gives you a smooth shifting experience. | Safe Riding:It is designed with double disc brakes, which can make the brakes more sensitive and smooth, allowing you to enjoy riding a safe ride. | 21-Speed Bike:Its main wheel has 3 discs and the driven wheel has 7 discs, you can choose to hang on different discs of the main and driven wheels to get 21 different speeds to facilitate your ride. |