27.5-Inch 21-Speed Three-Wheel Foldable Mountain Bike. This bike uses an High carbon steel frame, which is more secure. It also uses a thick shock-absorbing front fork, which can comfortably cope with various road sections and has a good shock-absorbing effect. The important thing is that this mountain bike is foldable, convenient and easy to store, you can easily carry it in Bus, ground drop, trunk, etc. And it is easy to install. what are you waiting for? Order now! | Winado | | 27.5 Inch Mountain Bike, 21 Speeds Women's & Men's Bike, Men's Bikes with Suspension Fork, Dual Disc Brake, Adjust Seat | Black& Green | Best Buy