City brake - the universal brake for max. 4x80mm (small size), 4x90mm (medium size) or 3x110mm (large size) configurations Many pads are delivered without brake. At Powerslide, we care about your safety and have developed several types of universal brakes that can be easily added to your current skates. The city brake can be used on most common frames on the market. The brake includes all necessary hardware and fits all common frames of 4x80mm or less (small), 4x84mm or 4x90mm (medium) and 3x110mm (large). It takes about two minutes to assemble the brake. The brake pad is made of long-lasting NR SBR material, a blend of natural and artificial rubber blends.