Watch them learn to skate as they grow in the Stryde Adjustable Inline Skates. Grippy, bouncy, indoor/outdoor Urethane wheels with speedy Silver-5 bearings ensure a smooth, quiet and confident ride. Designed to expand with growing feet, the Stryde adjusts up to four full sizes at the push of a button. Size small adjusts from childrens shoe sizes 11J-1 and has 64mm wheels. Size medium adjusts from childrens shoe size 2-5 and has 72mm wheels. Roller Derby is Americas Skate Company since 1936.