Z-Glas Wheels are used for all official Soap Box Derby local and rally races. These wheels are used in all three divisions, Stock, Super Stock, and Masters. The set consists of four racing wheels
These semi-pneumatic tires with spoked ball bearing wheels are used on the Adult/High School Engineering Design Challenge cars. They can also be used on Super Kids cars. NOTE: THESE WHEELS CANNOT BE ON STOCK, SUPER STOCK, OR MASTERS CARS IN OFFICIALLY SANCTIONED SOAP BOX DERBY RACES. The set consists of four racing wheels.