• OK... potentially very dumb question, but given my propensity for ordering parts from the internet only to realise I've measured something incorrectly/forgot to measure it at all, I'm trying to be a bit more cautious rather than assume I know exactly what I'm doing despite having never replaced a BB before...

    Replacing the BB on my early '00s trek. Measured up the BB shell and spindle length which comes out more or less as ~68mm shell, ~110mm spindle (see pics). Before I go ahead and order this Shimano UN300, am I missing anything? I'm keeping the triple chainring that the bike came with.


  • It it's coming off anyway, you can take it out and see what it says on the label.

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