Du-Bro Micro Sport Wheels 1.45" \(37mm\) Part No: 145MS. These open spoke wheels will add a sporty look to your model. They have been designed with electric models in mind. These also have many more applications in school projects and various crafts. Wheel Dia. = 1.450" \(37mm\), Axle Dia. = .078" \(2.0mm\), Weight = 1.8 grams/ea.