Originally Posted by
HOLYROLLER
I want a difficult ratio to build up the strength in my legs. This is part of the reason I started riding my bike again and why I chose to ride FG.
Thanks all for the input, it looks as though I will go with 55T x 12T. Currently I run 55T x 19T.
55x12 is 120 gear inches. That's more than olympic track racers use to win gold medals. I don't think there's any benefit to getting a 12t cog, unless you don't really like going up hills, ever.