This axle will allow you to run 2 larger inner wheels between the rails on your Pro Cross Chassis. The axle has a 1 and 2 inch offset, so based on your factory wheel size:
7 inch - you can run 8 or 9 inch
8 inch - you can run 9 or 10 inch
 
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 for your 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.
 
Combine this axle with our 10" billet wheels or 10" plastic wheels to get Alpha-sized rollers on your rear axle that came with the 8" tri-hub!