mach1 here is a link for the sprokets i foundhttp://motors.shop.ebay.com/items/GS500_W0QQ_nkwZGS500QQ_catZ6028QQ_pcatsZ6000QQ_pgnZ2

I also have a 15t front sproket on my bike and wont a little more but dont want to go down in the front any more than I have. I was wondering what size rear sproket would be good to use with the 15t. I dont do much highway rideing so thats not an issue.

I normally run a 15/41. I was looking last night if I had a 40 to try for a while. I avoid straight roads whenever possible.

I have a gearing/speed spreedsheet that I use for gearing selection at the track. I got it from EvilPumpkinRacing's website but I do not see it on there anymore. Let me know you want me to email it to you.

Quote from: dgyver on May 01, 2008, 03:46:15 AM
I normally run a 15/41. I was looking last night if I had a 40 to try for a while. I avoid straight roads whenever possible.

I have a gearing/speed spreedsheet that I use for gearing selection at the track. I got it from EvilPumpkinRacing's website but I do not see it on there anymore. Let me know you want me to email it to you.

If it's of any use, I made a gearing/speed spreadsheet that is tailored to the GS. Details here:
http://gstwins.com/gsboard/index.php?topic=41123.0

It's also in the wiki:
http://cgi.stanford.edu/~sanjayd/gs500/Main/GearingCalculator