What BB type is a SM BB9141?

bigpikle
bigpikle Posts: 1,690
edited July 2013 in Workshop
My Scott CR1 came with a DA crank and Shimano BB9141 BB. I'm looking at swapping to a power meter and trying to work out what type of BB standard this BB9141 actually is? I know its for a 91mmx41mm BB but what does this equate to in standards?

Looking at the compatibility lists I see BB386, BB90, BB92 (MTB), BB89 and BB86. I'm getting confused so would appreciate some advice/clarity.

Thanks
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Comments

  • mattv
    mattv Posts: 992
    It is a Hollowtech 2 fitment crank. Imagine it as a push fit HT2 bottom bracket. The outer edges of the bb shell are the same position as the outer edges of the screw in cups of a hollowtech 2 bb.
  • TheRealGuybrush
    TheRealGuybrush Posts: 125
    It's a BB86. BB9141 is the part number. That's a Shimano press fit BB. 41 is the OD and 91 is just the model series for Dura-Ace. You can get a BB7141 which is the Ultegra version.

    If you measure the BB shell of your frame it should be 86mm

    Any Shimano crankset will fit fine. You can fit a SRAM crank but you'll need to change the BB.
  • patrickf
    patrickf Posts: 536
    As above, it's a PressFit BB86. Though Shimano call it BB91, not BB86. The 91 doesn't refer to the Dura-Ace model number in this case.
  • ads2k
    ads2k Posts: 135
    Yep, press fit BB86, same as in my Litening.

    How's tricks mate :mrgreen:
    http://veloviewer.com/SigImage.php?a=c9 ... ij&z=a.png
  • patrickf
    patrickf Posts: 536
    TheRealGuybrush wrote:
    You can get a BB7141 which is the Ultegra version.
    Just spotted this. BB7141 = BB71, not an Ultegra model. BB71 = MTB bottom bracket.

    See here: http://www.davemellorcycles.com/productdetails.asp?productid=10279

    Do we have too many BB standards? :lol:
  • TheRealGuybrush
    TheRealGuybrush Posts: 125
    patrickf wrote:
    TheRealGuybrush wrote:
    You can get a BB7141 which is the Ultegra version.
    Just spotted this. BB7141 = BB71, not an Ultegra model. BB71 = MTB bottom bracket.

    See here: http://www.davemellorcycles.com/productdetails.asp?productid=10279

    Do we have too many BB standards? :lol:

    Correction, the BB71 is an Ultegra/XT spec version. The BB7141A is the MTB BB and the BB7141B is the Road BB

    The BB91 is the Dura-Ace/XTR spec version (costs £10 more). The BB9141A is the MTB version, and the BB9141B is the Road version. They also do a BB9142A which is an MTB version, however for BB shells with a 42mm shell OD.

    I know this, because I sell these all day long.

    If you look at the product code on the link you provided, you'll see it finishes with an A.
  • TheRealGuybrush
    TheRealGuybrush Posts: 125
    patrickf wrote:
    The 91 doesn't refer to the Dura-Ace model number in this case.

    As above, the 91 does indicate the Dura-Ace model number.
  • patrickf
    patrickf Posts: 536
    TheRealGuybrush wrote:
    patrickf wrote:
    TheRealGuybrush wrote:
    You can get a BB7141 which is the Ultegra version.
    Just spotted this. BB7141 = BB71, not an Ultegra model. BB71 = MTB bottom bracket.

    See here: http://www.davemellorcycles.com/productdetails.asp?productid=10279

    Do we have too many BB standards? :lol:

    Correction, the BB71 is an Ultegra/XT spec version. The BB7141A is the MTB BB and the BB7141B is the Road BB

    The BB91 is the Dura-Ace/XTR spec version (costs £10 more). The BB9141A is the MTB version, and the BB9141B is the Road version. They also do a BB9142A which is an MTB version, however for BB shells with a 42mm shell OD.

    I know this, because I sell these all day long.

    If you look at the product code on the link you provided, you'll see it finishes with an A.
    Fair cop. Clearly there are too many BB standards around at the moment.

    I've always associated BB86/91 with road shells and BB71 with MTB and would have expected the model numbers to match up.

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