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@youramericanlover
Too low, you'll spin like mad the whole way. It's flat pretty much the whole way. I'm on 74gi and that's almost a bit low for cruising on the flat for 80 miles+
Can you swap out a different rear cog? You want something between at least 65 -77gi
For your ratios check this: http://www.lfgss.com/post290498-19.html