Hollowtech BB problem

teacher
teacher Posts: 3
edited April 2010 in Workshop
Have fitted an ultegra hollowtech BB to a specialized roubaix sl2 frame, problem is I have a 2mm space between the non drive side and face. it has been torqued to 50nm so any ideas?

Comments

  • benpinnick
    benpinnick Posts: 4,148
    Have you fitted all the spacers (3)?
    A Flock of Birds
    + some other bikes.
  • John.T
    John.T Posts: 3,698
    No spacers required on road HT2 BB. The end cap only needs to be torqued finger tight before locking the crank bolts. The crank should push on easily to take up all the clearance. Something must be jamming it. Is the lock plate in the right position. I assume you are using a Shimano crankset. There could be problems with some others.
    My Fleet.
  • teacher
    teacher Posts: 3
    When installing the BB it is a gap between the BB and the face on the frame that is the problem, nothing to do with the crankset, one person has already said I should have spacers. Both sides of the BB screwed in easily by hand before I torqued them up so nothing seems to be wrong with the threads
  • John.T
    John.T Posts: 3,698
    It should screw right in by hand and then just need nipping up. Take it back out and check that the frame threads are long enough and there are no obstructions in the BB shell. If need be get the threads chased at a LBS. Something is stopping it going in and it can only be one of these.
    My Fleet.
  • freehub
    freehub Posts: 4,257
    Maybe the frame needs "facing"?
  • nicklouse
    nicklouse Posts: 50,673
    teacher wrote:
    Have fitted an ultegra hollowtech BB to a specialized roubaix sl2 frame, problem is I have a 2mm space between the non drive side and face. it has been torqued to 50nm so any ideas?

    so what was/is the crankset?
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • bexley5200
    bexley5200 Posts: 692
    may be the size of the bb shell on the frame is too narrow
    going downhill slowly
  • JohnnyAllez
    JohnnyAllez Posts: 785
    Unscrew the drive side a few turns and then see if the other (problem) side will now screw in, this will show you if there is enough thread for it to go all the way in, if not, then what John T said ^^^^^^

    If it`s an even gap then the "facing" of the frame is nothing to do with it. I would be most dis-chuffed if my frame had a 2mm gap at the BB due to "facing" :cry: 0.2mm possibly, but even Specialized couldn`t make something that far out !! :wink:
    Jens says "Shut up legs !! "

    Specialized S-Works SaxoBank SL4 Tarmac Di2

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