Du-Bro Super Lite Wheels 1 3/4" \(45mm\) Part No: 175SL. By far the lightest wheels we have ever produced! The Super Lite Wheel series feature a closed cell treaded foam wheel, with nylon hub. These wheels are ideal for electric, park flyers and lightweight gas models. 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: 4.4grams/wheel, Width: 0.6875" \(17.5 mm\).