Firestone 4.80-8 / 4.00-8 / 4.00-9 / 4.80-9 Inner Tube TR13 Straight Stem Tube fits tire sizes 4.00-8, 4.80-8, 4.00-9, 4.80-9, 4.00R8, 4.80R8, 4.80R9 and 4.00R9