2006-2008 Polaris Snowmobiles FS/FST Service Manual., Page 173Get this manual
Final Drive and Brake Systems FINAL DRIVE GEAR RATIO
Speed Chart
Reference the speed chart to determine which upper and lower gears can be installed in the chaincase, and to determine the mathematical vehicle speed for each ratio
Chaincase Speed Chart
Top Gear Bottom Gear Chain Pitch Gear Ratio 26 39 78 1.50 25 40 78 1.60 24 44 80 1.83 24 40 78 1.67 24 41 78 1.71 23 46 80 2.00 22 46 80 2.09 21 46 80 2.19 21 47 80 2.24