Differences?
So where are the differences? Well, first comes in the drive system. The SKS has stuck with the chaincase while the RMK adopted the QuickDrive belt system. Most snowmobilers are hard-pressed to tell the difference. The QuickDrive is lighter, but the chaincase allows a little more flexibility when it comes to gearing.
Next look at the suspensions, both front and rear. Although both use Walker Evans Shocks, the RMK relies on the Impact-Extruded Monotube for light weight, while the SKS comes with Competition Adjustable Piggyback shocks for performance.
Then you have to consider the track. The RMK features the Series 6 track which has a lightweight 2.6-inch profile designed for deep snow performance without compromising hard pack traction. The SKS features the Series 5.1 track that has a 2.4-inch profile with soft, flexible tips. There’s really not enough lug difference to make any one less functional in either powder or trail applications.