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  • Both JIS and ISO are square taper, they just have differing dimensions which is why a set pair of cranks will sit different distances out on each. It sounds like your cranks and BB are both JIS, which would mean that likely culprits are:

    • You haven't torqued the crank bolts to the right value.
    • The BB is installed the wrong way around
    • The spindle size is the wrong length.

    Have you done a sanity check to make sure the spindle is the length that you meant to order?

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