Specification:rubber wheel air wheel 1)pneumatic and solid wheel 2)palstic and steel ... rim 3)rubber esispastic and PU esispasti Specification:rubber wheel / air wheel1)pneumatic and solid wheel2)palstic and steel rim3)rubber ... .50-6 ,8)13inch : 13''x3.00-8, 13''x3.25-8, 13''x4.00-6, 13''x5.00-6, 13 ... )26inch : 26''x1.75'', 26''x1 3/8'' rubber wheel air wheel