Probs with ally campag cartridge bottom brackets?

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  • Why spec massive torque and then make the cups and splines out of cheese. Had a centaur BB, had to skip it after the mechanic finally got it out of the frame after it being fitted a week earlier and being the wrong taper. I simply wouldn't trust putting it back in another frame. He said the interface and material simply isn't up to the torque.

  • Fucking the splines is quite easy on most square taper BB made of aluminium.
    It's also quite easy to avoid if you fix your tool to the BB to prevent slipping.

  • Thats a great idea. I think omitting that little touch is half the reason it came out so bad.

  • Depends how worn the tool is, too - and if it's actually the Campag tool, or a pattern tool, or even an old Maillard freewheel remover which is almost the same splines but not exactly ... also, was the thread chased before the BB was put in, or was it going into / coming out of an already distorted thread?

    Lots of reasons for hitting this problem but the currently-available Centaur BB has been in production and essentially unchanged for 10+ years so if there was a real problem in materials or design, someone would have noticed by now ...

  • Ah, now that's a handy looking hack. The t-bar, how's that fixing into the the taper?

  • The t-bar is screwed into the spindle thread.
    The parts come from an old cheapo chainbreaker.

    1 Attachment

    • T-Bar.png
  • Got you. What's the thread size on that? I tried an m8 bolt and the pitch was wrong.

  • All BB-spindles i know of have M8x1 threads

  • Cool. Will try this out tonight. Cheers again.

  • I had a square-taper super-record bottom bracket that just seemed to come unglued. The two halves of alloy stuff came off the carbon tube holding them together.
    Replaced it with a Royce titanium one which is a thing of beauty, and will probably be discovered in perfect working order by archaeologists from another planet, aeons after our civilisation has vanished.

  • I suspect the cheapy cartridge BBs aren't spec'd to be installed / removed / installed again - use it till it dies, rip it out, bin it.

    It will probably do a billion more miles than a modern external / press fit doobry if that's any consolation

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Probs with ally campag cartridge bottom brackets?

Posted by Avatar for BernardRenault @BernardRenault