natural rubber inner tube 21-33 26.5-25 23.5-25 20.5-25 17.5-25 18.4-38 16.9-38 15.5-38 14-38 13.6-38 12-38 11.2-38 18.4-34 16.9-34 11-32 18.4-30 16.9-30 14.9-30 16.9-28 14.9-28 13.6-28 12.4-28 11.2-28 13.6-26 16.9-24 16/70-24 15-24 14.9-24 14-24 13.6-24 12.4-24 11.2-24...