OJ Wheels 54mm Chubbies with 99a Team Line Original Formula urethane. They're Wide, Round, and Plump! OJ's all new Chubbies shapes feature a super-wide riding surface for the best slides, with big round radial edges that make getting on-and-off of curbs, ledges, and edges effortless. Team Line Original formula is custom engineered to give you the original look and feel of OJ Speed Wheels with today's performance urethane that offers industry leading speed and reduced flat spots, with all terrain capability for any surface. All OJ skateboard wheels are sold as sets of 4. Wheel Diameter (Millimeters) 54 Wheel Durometer/Hardness 99a Road Surface (Millimeters) 22 Wheel Width (Millimeters) 37