BB86 BB

Discussion in 'Bicycle Mechanics and Repairs' started by roger44, 7 Mar 2018.

  1. roger44

    roger44 Regular

    I have acquired a BMC Teammachine SLR01 frameset, it needs a bottom bracket.
    According to BMC spec its a BB86.
    I fitting Ultegra groupset.

    my question is, the frame measures 74mm across width,
    so is it really a BB86 I need?, or is that for a framewidth of 86mm which it what the BB86 BB states.

    confused, any help gratefully recvd
     
  2. adscrim

    adscrim Veteran

    Location:
    Perth
    I've got a slr01 from 2012 and it's got a dura ace BB92-41 bottom bracket in it - ie shimano BB86.
     
  3. OP
    OP
    roger44

    roger44 Regular

    yes the Shimano product spec for BB86 shows the 92 as compatible, its the numbers that are confusing, when they talk about shell width of 86mm, do they mean shell width of the BB or of the frame?
     
  4. Eddy

    Eddy Guru

    Shell width of the frame I think, the bb comes with 2mm lip on each side, so an 86mm frame will end up 90mm.
     
  5. iluvmybike

    iluvmybike Well-Known Member

    I seem to remember mine also had a little spacer for drive side sop everything ends up right
     
  6. OP
    OP
    roger44

    roger44 Regular

    but my frame width is around 74mm?????
     
  7. Cycleops

    Cycleops Veteran

    Location:
    Accra, Ghana
    This is a press fit BB? You'll need a few special tools to remove and install the new one.
     
  8. Eddy

    Eddy Guru

    This is a BB86, does it look like yours? Are you including the bit that sticks out in the measurement?

    07-bottombracket.jpg
     
  9. OP
    OP
    roger44

    roger44 Regular

    thats my problem the frame came empty, and I dont have a clue about the different types of bb designations. it would make sense that the cups will stick out, but I also dont have the outer covers either, so will have to look those up as well
     
  10. Eddy

    Eddy Guru

    How old is the frame?
     
  11. OP
    OP
    roger44

    roger44 Regular

    2014
     
  12. Cycleops

    Cycleops Veteran

    Location:
    Accra, Ghana
    What year is it? This is a 2014 model and it's flush. BMC Team Machine SLR01 - bottom vracket 2.jpg
     
    Eddy likes this.
  13. OP
    OP
    roger44

    roger44 Regular

    YES THA
    Yes that looks like what I will have,
     
  14. boydj

    boydj Veteran

    Location:
    Paisley
    Google bottom bracket standards and you'll find lots of info on what's required in terms of bottom bracket, convertors and matching up with your chainset. Most have options for pairing up with standard Shimano 24mm axle chainsets, and other chainset standards.
     
  15. Eddy

    Eddy Guru

    There looks like a bit protruding on the drive side, don't you have that on yours?
     
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