Piranha Girl's Sporty 21 Speed Kids Bicycle, Purple, (Wheel Size 20-Inch) Frame/Fork: 13.5 inch steel juvenile MTB frame with suspension fork Wheels/Tires: Aluminum rims with 20 x 2.125 inch On/Off-Road Tires Drivetrain: 21 speed Shimano with twist shifters and a 3 piece crank and nylon pedals Brakes/Cockpit: Front and Rear V-Brakes with quick release seat post clamp Includes: Graphic Padded Saddle and quick release seat post