200T takes a 1/8 Axle (3mm). 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. Key Features: 1/8" (3mm) axle diameter can be drilled out to 5/32" (4mm) Fits inside most wheel pans and retracts .750" width (19mm) Low bounce, shock absorbing