Du-Bro Treaded Tire 2-3/4" (70mm) Part No: 275T. 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. These also have many more applications in school projects and various crafts. Diameter: 2.75" (69.85 mm), Axle Diameter: 5/32" (4 mm), Weight: 43grams/wheel, Width: 0.900" (23 mm).