Seismic Hot Spot Wheels 66mm x 49mm 88A set of 4. 47mm running surface, Offset bearing seat, Square outside edge, beveled inside edge. The 66mm x 49mm Hot Spot is a small, super-agile version of our 69mm and 76mm Hot Spot shapes. Molded around our advanced Mini-EC hub, it’s a light, quick, do-it-all wheel - ideal for general-purpose cruising and Tight / Hybrid slalom.