Originally Posted by monkeyking

Here's a good source for caculating: http://software.bareknucklebrigade.c...it.applet.html
I ride 50x19 (69 GI) on my Panasonic and 46x16 (75 GI) on my Gan Well, both brakeless (in Dallas which is also pretty flat). Personally if I were running a 48, I'd probably go with a 17 cog for the skid patches and 74 GI is pretty reasonable for flatter terrain.