Shimano Octalink BB problem.

Discussion in 'Cycling Equipment' started by Bigbananabike, Jul 18, 2008.

  1. Bigbananabike

    Bigbananabike Member

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    I've just noticed my 9 speed Octalink BB is loose:eek:
    I've done about 20 k kms with it after getting it secondhand.
    Are the bearings worn?
    Could they be replaced or should I get a replacement BB?
     
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  2. artemidorus

    artemidorus New Member

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    Octalink is prone to loosening of the crank bolts, so they're the first thing to check. Mine got quite loose, but were able to be retightened without apparent damage.
     
  3. kdelong

    kdelong Well-Known Member

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    +1. If it turns out to be bearings, I beleive that you will need to buy a new BB unless you are extremely handy, have a bearing press and a shop oven.
     
  4. Bigbananabike

    Bigbananabike Member

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    I checked those although I was pretty sure it wasn't them as both crank arms move.
    So - replacement BB then?:eek:



     
  5. Bigbananabike

    Bigbananabike Member

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    Looks like you're right...as I had thought too.



     
  6. artemidorus

    artemidorus New Member

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    If it wasn't the crank arm bolts, have you checked that a cup hasn't loosened?
     
  7. Bigbananabike

    Bigbananabike Member

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    Good thought:) Checked both cups. No:eek:



     
  8. artemidorus

    artemidorus New Member

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    Does the axle have play, or is it simply rough? Replace with Ultegra, DA is an open system requiring regreasing after every wet ride, apparently.
     
  9. Bigbananabike

    Bigbananabike Member

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    Its got play - no roughness.
    Ultegra.
    Who on earth could be bothered regreasing the BB after a wet ride?! (rhetorical q):eek:

    I'll take it to my LBS on Thursday with another secondhand Ultegra BB I have for the changeover.



     
  10. artemidorus

    artemidorus New Member

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    I've never had a worn BB develop play - make sure that the crank sockets are not damaged.
     
  11. Bigbananabike

    Bigbananabike Member

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    Thanks for the replies.
    The play in it seems strange to me too. The cranks have been on the bike / BB for about 20k kms (as long as I've had the bike built up) and are still tight on the BB.
    I've never had a BB wear out so didn't know what to expect.



     
  12. mikeg

    mikeg New Member

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    Make sure you are not mixing Octalink V1 & V2 versions.

    See

    http://www.sheldonbrown.com/gloss_n-o.html#octalink

    and

    http://www.sheldonbrown.com/bbsize.html#shimano

    A V2 crankset (eg. Tiagra octalink) will fit on a V1 Bottom Bracket (eg. 105 or Ultegra) but will have play in it.

    Mike
     
  13. Peter@vecchios

    [email protected] New Member

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  14. mikeg

    mikeg New Member

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    Yes I did mean that they should not be mixed, by saying that it would have play in the crank to bottom bracket interface. It was done to me by a not so LBS I bought the bike from, for a warranty replacement of the specialised brand crank when the arm to crank webbing cracked. They fitted a V2 Tiagra crankset to the 105 V1 BB. The amount of play this mismatch produced made it very difficult to ride. The mechanics at the bike shop should have known better.
     
  15. Bigbananabike

    Bigbananabike Member

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    I've done about 20k kms on it before the play started so I hardly think that the cranks/BB are incompatible and it was me who put the two together:) & I like to think I know something of what I'm doing re bikes.





     
  16. mikeg

    mikeg New Member

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    Which model and year bottom bracket and cranks are they?
     
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