Rainskates 59mm/98a Killer Bee Single Conical wheels. The Rainskates Yellow/98a Urethane formula is well know for the special combination of SPEED & GRIP, and is the "go to" wheel for most people. This unique balance gives you a wheel that you can have confidence in, letting you push the limits without the fear of your wheels losing contact suddenly. These measure 59mm x 34mm wide.