Using professional front and rear derailleurs and trigger lever support you to switch through the gears very easily by hand. The all-terrain tires for mountain bikes have a super excellent anti-skid function and powerful grip so our bikes ensure your children's safety when used on different terrains. | Winado | | 26 Inch Mountain Bike, 7/21-Speed Adult Bicycle with Sturdy Steel Frame, Front Suspension,Excellent Twist Shifting | White&Purple | Best Buy