• It's baffling me too. i know it shouldn't be this hard....

    Bob Jackson Frame = 68mm BB shell
    108mm Phil wood BB with cups
    Phil wood 1/8th cog

    According to everything I've read it should all fit nicely. - The only thing I'm missing is a caliper so I can check if the cups have seated on the BB properly: it's one hell of a tight fit so I might not have applied enough force.

    I'll give it another go tomorrow when I've got fresh eyes.

    Cheers for the advice all.

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