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@Julio
I'M USING 46: 18 at the moment. My gearing is pretty light - 67.5 gear inches, and that's the way I want to keep it
If I put a 17th cog on (the next one down in size) then I'll have 71.5 which is much higher than I want.
I could put a 44th ring on and get 66 inches, or I'd have to use a 46 and a 19 to get 66 gear inches