These are for the ProCross/ProClimb chassis with 1/2" or 1" (please specify) rail slots that originally had 8" wheels.  Runs 4 wheels and eliminates the plastic hub.  Measure your sled for fitment. Sleds with coupled rear suspensions should check for clearance between the wheels and the cross bar for the rear suspension arm stop. The kit comes with the billet offset axle that allows the use of these larger than original wheels and four 10" plastic wheels with standard bearings.
 
Add a custom look while addiing performance by reducing rolling resistance.