Razor Groundforce Rear Wheel Set REAR Wheel Assembly (Set of 2) for the Razor Ground Force Go Kart. Includes 6900Z bearings, sold as a pair. Only 1 wheel has the bearings installed, the other wheel is the drive wheel and does not use bearings.**NOTE: These are the REAR wheels with 6900z bearings. If you need front wheels with 608Z bearings, please click here to order the Ground Force FRONT Wheel located in the Ground Force Go Kart Parts Section. Not compatible with the Ground Force Drifter. Rear Wheel Set1 Drive Wheel, No Beari ng1 Free Wheel, 6900z BearingOverall Diameter: 113mmWidth of Tire: 62mmHard Rubber TireIncludes HardwarePlease Note: NOT compatible with the Ground Force Drifter **Note: Please confirm your Razor Model and Version number before ordering. See Chart image.