Ricta Chrome Core Skateboard Wheels, Red/Gold, 53mm, 81b Rad/gold Chrome Cores from Ricta are the peferct wheel for street and parks. Hard, fast and slide killer. 81b is on the harder side (compare to 100a). Even better if you like the Niners Chrome Core Skateboard Wheels from Ricta Skateboard Wheels from Ricta Ricta Chrome Core Skateboard Wheels