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42/14
... but I was wondering, is there any difference if chain ring is bigger and driver cog is proportionally smaller? ie: 42/14 is a ration of 3, and so is 48/16. Is there any difference in terms of starting, hitting a cadence or spinning?
I'm trying to get my head around the physics. I guess you spin slower on a 48? Any ideas/experience/opinion?
... and what's the smallest driver cog you can buy?