Seismic Hot Spot Wheels 69mm x 52mm 78A set of 4. 50mm running surface, Offset bearing seat, Square outside edge, beveled inside edge. The 69mm x 52mm Hot Spot is a smaller, more nimble version of our 76mm Hot Spot. Molded around our advanced Mini-EC hub, it’s ideal for fast freeride, technical downhill, Tight and Hybrid slalom, and general-purpose cruising.