Cal 7 Skateboard Wheels and Bearings | 52mm Wheel Set Combo SMALL WHEELS  52mm size is ideal for trick and technical riding. IDEAL HARDNESS  99A and 100A PU wheels are the perfect combination of speed and grip. PREMIUM BEARINGS  Set of 8 ABEC-7 bearings equip the front and rear axles. SPACERS INCLUDED  4 spacers extend the life of your bearings and make for smooth, stable skating. VERSATILE USE  A great choice for skating street, ramps, pools & parks.