what size chain would i need for a 15t front and 45t rear. or can anyone tell me where to look to find it

just get 120 links and cut it to fit.

If you mean aspect ratio...you get the same size chain as the sprockets.

your best bet is going to be exactly what mak said....


Order Long... cut to length.

From:

http://tsubaki.com.au/tsscs/chain_length.htm

For 16/39T and 110 links:

Your ideal centre distance is 25.679 inches.

For 15/45T and 112 links:

Your ideal centre distance is 25.45 inches.

If you are ordering chain by length the supplier will ask for the chain pitch as different bikes use different sizes dependent on their power output. The pitch of any chain is related to the distance between its corresponding sprocket teeth and their width. If you attempt to fit chain of the wrong pitch to your GS you will find it wont engage correctly on the sprockets.

The GS has "520" pitch chain and sprockets as standard.

anyone know where i can get one. the only place i found one last night was dennis kirk and it was $110

http://www.chaparral-racing.com/Chaparral/productr.asp?pf%5Fid=312%2D1912&gift=False&HSLB=False&mscssid=00B3EC5739907545B68534098B3FBFD1

http://www.chaparral-racing.com/Chaparral/productr.asp?pf%5Fid=312%2D1920&gift=False&HSLB=False&mscssid=00B3EC5739907545B68534098B3FBFD1

And the one I use:

http://www.chaparral-racing.com/Chaparral/productr.asp?pf%5Fid=312%2D1910&gift=False&HSLB=False&mscssid=00B3EC5739907545B68534098B3FBFD1

I just use $19 rollers...most dealers will set you up for less that $25 for a decent one.