Wheel Diameter = 69mm Wheel Width = 48mm Durometer/Hardness = 78A Wheel Contact Width = 44mm Wheel Formula = Soft Slide Formula Primos are an affordable soft wheel with extra urethane depth which is perfect for cruising and upgrading completes, but at their heart are poured in the same high performance freeride and downhill formulas that are world renowned for slide performance. The 78a 69mm is “Paster” formula.