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Where did that Polaris Gearing chart go? Google, old forum, new forum- lots of dead links.
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(CDx2)/.375 + (TS+BS)/2= pitch
CD=center distance (for you 8.373" on the 2008/2007/2006 RMK)
TS=top sprocket
BS=bottom sprocket
20/39 74 pitch
20/40 74
20/41 74
20/42 74 or 76
20/43 76
20/45 78
19/39 72
19/40 74
19/41 74
19/42 74
19/43 74
19/46 78
18/40 72
20/39 – 1.95:1
20/40 – 2.00:1
20/41 – 2.05:1 (Lukes 935 & Carls Recommended for the 975)
20/42 – 2.1:1
20/43 – 2.15
19/39 – 2.05:1 (HIghMark-Rec recommended for the 935)
19/40 – 2.105:1
19/41 – 2.16:1
19/42 – 2.21:1
19:/43 – 2.26:1
18/40 – 2.22:1
Here are the Polaris Gearing Charts to help you decide what gear to run in your sled. These charts are only for those sleds with the 7.92 chain case like the IQ's, ProX's, RMK's, etc