OJ 78a Super Juice Skateboard Wheels OJ 78a Super Juice Skateboard Wheels - The ideal and perfect set of cruiser wheels. The OJ Mini Super Juices roll fast and smooth! Wheel Diameter (Millimeters)60 Wheel Durometer/Hardness78a Road Surface (Millimeters)37 Wheel Width (Millimeters)45 Sold as a set of 4 Click here to shop OJ Wheels About OJ Wheels: Elite Urethane since 1974. Fuck with the Juice!