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  1. #1
    mtbr member
    Reputation: dirkdaddy's Avatar
    Join Date
    Sep 2007

    New question here. Arrgh. Need opinion on crank arm length daughter's bike

    I ordered a crankset from a vendor for my 12yo daughter's bike build. Its a 15" 26"r bike. The crank was supposed to be 170 throws. They shipped a 175. I sent it back, and customer service was not very fast, and eventually, I got a new crank... and go figure....its also 175.

    My daughter is growing fast, I'm 6'0" and wife is 5-7. Daughter is 5' and inseam is 29" Her 24" bike a Marin had 170 cranks.

    I realize its only 5mm, and we have not gotten her into doing really long rides, but should I hold out for a 170 I am losing patience with vendor.

  2. #2
    mtbr member
    Join Date
    Apr 2012
    5mm will, in all likelihood, not make a huge difference. All that is really going to change is that the seat will have to come down a tiny bit, assuming it is setup to a 'proper' pedaling height.

    If it was a 24" bike, I might pick a fight about it, but then again, crank arm length is pretty subjective; my Chicago Schwinn has 165mm cranks on it, and it is intended for an average-sized adult. My mountain and road bikes, both with about an inch more of seat tube, have 175mm cranks.

    Short answer: put it on.

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