Can the 8'' rear wheels be installed on a 121'' track without new mounting holes being drilled or the rear arm being moved? The aftermarket sells an offset axel that I'm assuming positions these wheels so you don't bottom and nothing rubs?? Anyone? Thanks

juk, the offset axle is to keep the bottom of the wheel in the same positon relative to the hyfax. it also eliminates the need to cut on the rail for this reposition that some kits require. On alot of sleds the bigger wheel will bottom and hit the tunnel, on our zx summits we have to run track risers. But on our rmks with the tilted tunnel they clear.