TKI billet axle kit to install 1" taller wheels. These will take your Ski-doo 180mm wheels to 8" or 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 fit Cat, Polaris and Yamaha rear skids. Order wheels separately.