New cartridge BB cup/spindle tightness?

pastryboy
pastryboy Posts: 1,385
edited April 2011 in MTB workshop & tech
I've had trouble with plastic non-drive side cups so got hold of an alloy one to go with a new UN26 BB. The BB and cup went in fine but if I tighten the non-drive cup until it's tight then the BB spindle becomes slightly stiff. If I loosen the cup a fraction the BB spindle spins freely.

What's the correct way to have it?

Comments

  • supersonic
    supersonic Posts: 82,708
    Not sure how this is happening. The non drive cup supports the cartridge body - that is all.

    Torque to required measurement.
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  • nicklouse
    nicklouse Posts: 50,675
    get the driveside side of the BB shell faced.

    if it is way out it can put the BB off centre and then when you add the non drive side cup it misaligns every thing.

    you may as well get the BB fully faced and chased.
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  • pastryboy
    pastryboy Posts: 1,385
    That's what I thought supersonic but it's definitely happening - there's a specific point which it happens at.

    What would happen to make it require facing? I'm only replacing like for like

    It's a pretty old bike I only have as a backup so I'm loathe to start spending loads on it.

    Thanks
  • pastryboy
    pastryboy Posts: 1,385
    I would mention I had a pig of a time trying to get the old plastic cup out..

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