... " knobby tires 12", 14", 16", 20" inch With CE Royalbaby Freestyle kids bike toy with wide pneumatic tires and steel framesFeatures Freestyle Model ... , 1.4mm, alloy, EDBrakeF/Capliper brake, R/band brake or coaster brakeTirePneumatic rubber wide 2.4" knobby tires, 40psiInnertubeButyl rubber, presta valveRimSteel ...