TKI CNC - TOM KOBZA INC billet axle kit (NOW BLACK ANODIZED ONLY) to install 1" taller wheels. These will replace your Ski-doo oem 180mm wheels to 8" or ski-doo oem 200mm wheels to 9". NEw for 2018 these come with REV GEN4 inserts also. These reduce rotating friction by decreasing the bend your track has to make around a smaller wheel. These are machined for 25mm bearings and are patented. They also include rail adapters for Cat, Polaris and Yamaha rear skids. These include adapters for the REV GEN4 now also ! all of our TKI CNC axles are now hard anodized black for better finish and durability and cost $10 more than the raw aluminum axles. Order 8" or 9" wheels separately.