The Strider Sport 12 Running Bike is similar to the previous ST-4, but includes updated graphics and an extra-long seat post. The Sport 12 is the perfect balance of performance, options, and value, featuring more than 8 years of design evolution and manufacturing improvements. Unique Handlebar 12.7mm steel handlebar is 43% smaller than standard to allow better control with tiny hands. Custom logo mini-grips are soft urethane with protective ends. Machined-aluminum quick release allows "No Tools" height adjustment from 46-56cm (18-22"). Strider-exclusive, ultralight one-piece wheels sport a raised-letter, five-spoke design with 10 bearing support gussets for maximum strength at the lightest weight possible. Top-quality sealed cartridge bearings roll smooth and never need adjustment. EVA polymer tires (industrial foam) tires are super light and durable yet offer a smooth ride. Best of all, they never need air and will never go flat. The durable, all-weather mini-saddle is designed specifically for beginning riders and their tiny hips. Smaller, narrower, and lighter than a typical saddle, this seat allows for proper riding position and posture. ** The Sport model also includes a padded XL saddle and long seatpost to fit kids over 3 years and allows seat height adjustments up to 48cm (19"). The Strider Sport has a Unique, frame-integrated footrests are properly positioned directly below the saddle for natural bike balance. This position also fosters the advanced ability to stand while gliding as well as pumping and jumping the bike Strider-exclusive rear brake mount allows the addition of a foot-operated brake once the kids are proficiently gliding with feet on the footrests. Brake sold separately.