Hello you are buying 12 "New" silicone REAR tires for AFX/Autoworld 4-Gear Specialty Chassis. These tires are specifically made and fitted for the AFX/AutoWorld stock sized 4-Gear chassis rear rim. These tires have a good snug fit and stay in place on the rim. These will work great on any plastic or wood track. I added a nice small rolled radius to the outter edge of these tires. This improves performance and helps eliminate the tripping effect of the tires in the corners. All my tires are vacuum degassed and are very consistant in size and composition due to this process. The silicone tires composition have good balance of firmness to not sacrifice speed, but yet soft enough to not sacrifice grip. These are a great improvement over the stock AFX/Autoworld rubber tires. Specs: - .520 outside diameter measured with tire on the rim. - .245 wide.

• .520 outside diameter measured with tire on the rim.
• 245 wide.

.520 outside diameter measured with tire on the rim.import