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.