• yes 7 x 3 = 21 !

    The 3 at the front is a given on an MTB

    Not sure I agree... you might be right on XC, but plenty of bikes have 1 x 8 or 1 x 9 and I'm sure I have seen stuff 2 x 9 (can't remember what, but I think some kind of racing where weight is important and 3 rings not necessary)

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