DU-BRO?? treaded wheels are narrower in width to fit inside wheel pants and retracts easier. Comes with 3/16" (5 mm) axle diameter and can be drilled out to 1/4 (6 mm) if desired. Comes complete with our positive seal air valves and inflator adapter. 1 wheel/pkg. For replacement valve: #809 / For replacement tire inflator: #333 ----------------------------------------------------------------------------------------------------------------------------------------- #375TV - Diameter:3.75" (95 mm) / Axle Dia.:3/16" (5 mm) / Weight:117grams/wheel / Width:1.160" (29.4 mm) ----------------------------------------------------------------------------------------------------------------------------------------- #400TV - Diameter:4.00" (102 mm) / Axle Dia.:3/16" (5 mm) / Weight:138grams/wheel / Width:1.175" (29.8 mm) ----------------------------------------------------------------------------------------------------------------------------------------- #450TV - Diameter:4.50" (114 mm) / Axle Dia.:3/16" (5 mm) / Weight:180grams/wheel / Width:1.375" (34.9 mm) ----------------------------------------------------------------------------------------------------------------------------------------- #500TV - Diameter:5.00" (127 mm) / Axle Dia.:3/16" (5 mm) / Weight:243grams/wheel / Width:1.500" (38.1 mm) ----------------------------------------------------------------------------------------------------------------------------------------- #550TV - Diameter:5.50" (140 mm) / Axle Dia.:3/16" (5 mm) / Weight:282grams/wheel / Width:1.750" (44.4 mm) ----------------------------------------------------------------------------------------------------------------------------------------- #600TV - Diameter:6.00" (152 mm) / Axle Dia.:3/16" (5 mm) / Weight:367grams/wheel / Width:1.900" (48.2 mm) -----------------------------------------------------------------------------------------------------------------------------------------