Ricta Wheel Dynamics 60mm Clouds Blue 78a white, blue core, debossed and pad printed lettering. Super-soft urethane for cruiser setups and general transportation. Ricta Clouds are the most diverse cruiser wheel family in skateboarding. With sizes from 52-60mm and 78a, 86a, and 92a durometers, Ricta makes a soft wheel for any terrain or setup.