I am looking to change my rear sprocket to either 43 or 45 tooth setup while retaining the 15 front sprocket. I have a 2005 800ss, pretty much just ride in the city and am not a fan of the low speed chugging.
I have read a bunch of posts here and looked at gear commander as well. Seems like 15/43 is a popular setup. Has anyone tried the 15/45 setup? Also please let me know your general thoughts as well.
Same thing here execpt on a '97 900SS. (stock is 15/37)
I was thinking about changing the rear sprocket to a larger one but (just like you) I didn't know how much larger to go.
So instead of changing the rear sprocket to a 39 or 41 I changed the front to a 14.
The idea was that this way I could test the ratio change in a cheap way (no new, longer chain needed and a front sprocket is cheaper than a rear).
15/37 (stock): 0,405
So with the 14/37 I'm pretty close to the 15/39 ratio and I'm happy with the way the bike acts. So next time I change the chain and sprockets I go for a 15/39 setup. The reason that I will go back to a 15 teeth front sprocket is that with a 14 teeth sprocket you have to keep an eye on the chain guard on the swingarm to prevent the chain eats itself through that guard into the swingarm. So for now I make sure to keep my chain on the correct tension and check the chainguard weekly for excessive wear.
This method translated to your bike would give:
15/39 (stock): 0,384
So in your case you could test a 14/39. That's just above the 15/43. If you're happy with the result the 15/43 will probably be the best setup. If a 14/39 sprocket doesn't give you by far the change you're looking for go for a 15/45.
I think this is the easiest, fastest and cheapest way to test another ratio.
(with a big thx to ducvet, who suggested me this method of testing)