Strider ST-3 Nitro Circus Balance Bike Balance Bikefor Toddlers Focused on 18 to 36 Months Old - No Tools Needed for Assembly Ergonomically designed for Toddlers. Small grips and seat for small hands and legs. Built-In Quick-Clamp Adjustable Seat and Handlebar Heights! Patented frame design features Launchpad Footrests for many years of skill development Never fill, puncture proof tires make Strider maintenance free for parents. Sizing: Adjustable handlebar and seat height to fit riders from 30" to 44" tall (saddle height adjusts from 11" to 16" from ground)