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  • nv55 49:18 gives 73.5 inches. Although that online calculator posted at the top gives that gear as 71.5... which is wrong, i think.

    You are only running 73.5 if yop are running 27" wheels, I suspect you are running 700 cc x 23 mm, hence a smaller number.

    me 52x18 = 75.9"

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