well guys i looked it up and u can go down to a 12tooth on the front which i think will make the GS a Wheelie machine for stunting but u can go upto 19 tooth on the front aswell which would increese topend, i'm going to get all of them and try every1 of them and then choose the best.

Sprocket Specialists offers (recommends?) all kinds of sizes for the GS500.  The Sprocket Specialists listing for the GS500 in my Chaparral catalog includes:

* Aluminum rear sprockets with 32-74 teeth (from $34.96 to $62.96)
* A steel rear sprocket with the stock 39 teeth only ($32.96)
* Steel front sprockets with 11-17 teeth ($10.96)[/list:u]Just one caution on the Sprocket Specialists front sprockets: they are one-size-fits-all-years and don't come with the "shoulder" that the OEM sprocket on the '94+ model years has.

For some past discussion on this topic, see the old thread

spacer for 15T drive sproket.  I wish I knew what happened to thread #2244 which is linked to in that thread.  "Um, JOHN?"

Another relevant thread (that includes the photo mentioned at the end of the first thread) is Knock when shifting

thats gr8 maz, tell us how they work out. espcially the 12t smaller stunter sprocket  

Devil's advocate here...  I wouldn't recommend gearing down to 12.  You will get a ton of slack and may have to cut or buy a new chain.  You may risk binding the chain.  I don't know how well the chain will "roll" over such a small sprocket.

I'd say better to go with a larger rear sprocket... when I can afford it I will try a larger rear sprocket.

yeah, it would be better to get a larger rear sprocket BUT they weigh more and slow you down...i wouldn't get a biger rear sprocket unelss it's aluminum or some kind of light metal

Quote from: GRUyeah, it would be better to get a larger rear sprocket BUT they weigh more and slow you down...i wouldn't get a biger rear sprocket unelss it's aluminum or some kind of light metal

You're replacing the rear sprocket- not adding another.  So, you mean the added weight of two or three teeth will slow you down...  Keep in mind that you have just regeared your bike- I think the extra ounces will be compensated for.  

I'm just sayin' that the GS isn't the most weight efficeint bike- there are lots of things that can be done to clean it up.  But I'm a fan of true working performance and will deal with added weight if it means my bike will run safer or more consistant.

I dropped one tooth in the front.  You do not lose top end speed, actually as most stock GS's won't do redline in 6th gear in the first place.  You will be able to get more top end RPM's when you lose a tooth, making up the speed difference.

Just completed the 15t install. Front and back sprocket went on very easily, but my chain did not want to break my buddy and I were using the chain tool and it just did not want to go. Finally got it to go then realized I had way too many links on the new 520 chain. I heard that the 15t will leave you with extra but damn... Had to take off a few to get it to work. Those links were stubborn as well and did not want to come all the way off. Had to grind down the two pins so they would slip out. Yes! It's out so then I put the master link on and it is really putting up a fight to snap in place. Well about 2hr's for the whole project and it's done.

First off I've noticed a big difference in low end tourque. Can actually use some clutch play and it pulls a good bit harder in first and second. Have noticed the engine reving harder and personally would feel that a 14t would be overkill and greatly effect top end speed. Overall I'm happy with the results. Damn O-ring chain really did not want to cooperate and had me worried for a second. Thank you Mr. Grinder...

Thnaks for bumping this thread back to the top.  After all the work I did on the previous page to document the sprockets available from Dennis Kirk, I rediscovered a more comprehensive text file that I put together a while back.  It includes chains and both sprockets, from 3 different catalogs.

For what it's worth!

http://www.bbburma.net/Documents/GS500_Chains&Sprockets.txt

EDIT: Changed link from sisna.com to bbburma.net.