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  1. #1
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    Old Marin BB size help

    I have a Marin Muirwoods rigid MTB with a Shimano FC-MC20 crankset that I bought in the early to mid eighties and am trying to determine the BB size. I have tried contacting Marin directly but they don't respond. Short of taking it off to determine the size, does anyone know the size? Much appreciated.

  2. #2
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    the size of the BB axle depends on the crankset, not the frame. search around Shimano's website for that model number.

  3. #3
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    Shimano lists the UN 26 BB but when I look that product up there appears to be 9 different sizes.

  4. #4
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    I would just take the arms off and measure it. that takes less than five minutes and you could have had your answer by now.

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