Du-Bro Micro Sport Wheels 2.5" \(63.5mm\) Part No: 250MS. 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. = 2.500" \(64.5mm\) / Axle Dia. = .078" \(2.0mm\) / Weight = 6.9 grams/ea.