Du-Bro Treaded Wheels 1 3/4" (44.45mm) Part No: 175T. 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: 1.75" (44.45 mm), Axle Diameter: 1/8" (3 mm), Weight: 13grams/wheel, Width: 0.675" (17 mm).