Stock your sled came with 20-39 gearing, so before you buy make sure you are positive what gears you have. Also, You have the 11W gears. 11W means your chain is 11 links wide, 13W means 13 links wide, not 13mm wide. 3/4" wide gears are for the HYVO system, which you do not have.
My mistake, I was looking up specs for a '97 XCF. The '97 SuperSport does indeed have a 21T stock, still uses 11W gears though.
But are you sure you have a 1997? Your hood and nosecone are that of the 1998 Supersport. You need to know because the '98 uses the HYVO system, in which case it has 22/41 gears stock.
If the manufactured date on your tunnel is in 1997, you have a 1998 Supersport.
Your current ratio is 1.86 with the 22/41 and 68 pitch chain
You could go to 21/41 for 1.95, or go to a 66 pitch for 20/39 (also 1.95) or 19/39 and the 66P chain (2.05). It is not recommended to go to 20/41. Since you have studs, you could pull off the 19/39. But, that means you need a different chain and both gears, which is also a pricey route.
On my sled I don't have studs, so I went from 22/41 to 21/41 and it pulls pretty hard and gets to 70 quickly before the acceleration starts to taper off. Haven't topped it out yet, highest I've gotten so far is 85. With the 22 tooth I could get 92-98 on the speedo depending on ambient temperature.
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