Originally Posted by operator

Ideally i'd like a 15.5T but I don't think that's possible Runing a 42t Front with 15 is a bit heavy (75)especially on longer rides with rolling hills. However 16t seems TOO easy as that's 70 GI.

I don't want to change out my front chainring

This ad is comical: http://toronto.craigslist.org/bik/280476993.html
" i'm selling it for only 350$ any bike shop or professional will tell u it's worth much more."