OJ Super Juice Wheels NOTE: Sold only as a set of four (4) wheels. Diameter 60mm Hardness 78a Width 60mm Riding Surface 45.5mm Core No Formula Natural The combination of wide riding surface and softer durometer makes this OJ Super Juice wheel fast, grippy, and able to go over all sorts of cracks and debris. With this kind of grip you’ll be able to take turns at higher speeds without worrying about losing traction. OJ Wheels was founded in 1974, being one of the first skate companies to be established. They have since become globally recognized for their specialty skateboard wheels, using the best polyurethane formulation available.