These are for the ProCross/ProClimb chassis with 1/2" or 1" (please specify) rail slots that originally had either 7" or 8" wheels.  Runs 4 wheels and eliminates the plastic hub and/or original axle.  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 9" billet aluminum wheels with standard bearings installed.
 
Add a custom look while addiing performance by reducing rolling resistance.