High quality synthetic rubber- & semi pneumatic Tires for Slot- und RC-Cars Tires more Doughnuts Doughnuts are raw rubber tires, which are not glued on rims. They need to be grinded to a suitable diameter before being used. more Production All GP-Speedtires are manufactured, glued and grinded in Germany. Each single step is based on the wide experience of Mr. Juergen Plan. more