Seismic Urchin Wheels 75mm x 48mm 80A set of 4. 42mm running surface, Offset bearing seat, Radiused outside edge, beveled inside edge. Ideal for fast freeride, the 75mm by 48mm Urchins love going FAST, gettin sideways, and rippin corners! Height and width perfectly balanced for modern all-around riding. Slide release that's smooth, easy, comfortable, and predictable. Amazing in-slide feedback and control, bleeding just the right amount of speed. Vibrant thane lanes. Consistent wear.