Crazy Bruiser Wheels: Crazy Bruiser wheels have for years, set the standard in Derby and outdoor skating as the longest wearing, highest performing hybrid wheel on the market. A specialized 84a durometer urethane poured in the USA, provides incredible grip on the tightest corners with a high rebound roll on the straights. Outdoors, the wheel performs flawlessly absorbing the bumps and grooves of the outdoor paths with a high wear resistance – giving the wheel a long lifespan. The Delrin hub provides great control with low weight, perfect for the track or the road. Available in 4 dimensions, you choose between tall, short, slim and wide – Get the wheel you need for your performance needs.