Urban brake Size Medium - the universal brake for max. 4x90mm setups. A lot of urban skates come without brakes. We at Powerslide care about your safety and developed several kinds of universal brakes that can be easily added to your current skates. The urban brake can be used on the most common frames in the market. The size Medium is specially made for 4x84mm and 4x90mm frame setups and includes all necessary hardware for the assembly. It takes about two minutes to assemble the brake. The brake pad is made of long-lasting and abrasion-resistant NR/SBR material. a mix of natural and synthetic rubber blends.