JConcepts 9 Shot 2.2 Dirt Oval Rear Wheels (White) (4) (B6.1/XB2/RB7/YZ2), is designed for 1/10 scale buggies and has a rear wheel hex size of 12mm. The inner tire and outer wheel diameter measure 2.2 inches, making these wheels suitable for dirt oval racing. No tires  included in this package.