Runs four wheels, Dual 1/2" and 1" offsets which can run 8" or 9" wheels on a skid orginally running 7" or 9" or 10" on a skid originally running 8" wheels.    Uses 6205 bearings. Photo for reference only and not the exact product.
 
For the 2012 and newer Pro Cross/Pro Climb chassis, and Yamaha Viper/Sidewinder sleds built on the A/C chassis with a 1/2 inch slot in your rails where your axle bolts.