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" \(17 mm\).