2" Dia. (50.8mm) Treaded Surface Wheels (2) (#200T) Takes a 1/8 Axle (3mm). Can be drilled to 5/32" (4mm). Fit inside most wheel pants and retracts. Du-Bro's low bounce captive air wheels have flown on more airplanes over the years than any other wheels on the market! The wall thickness is consistent throughout the wheel giving you a balanced tire. Comes complete with a sporty nylon metallic hub. Works well on grass & paved runways. SKU Number: DUB200T