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  1. #1
    RoadBikeReview Member
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    Mar 2011
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    613

    pressfit confusion

    Hi,

    I'm looking at a frame. On the manufacturers site the bottom bracket standard is called pressfit. The bike is also sold complete with a "Shimano Ultegra FC-6750 Hollowtech II Compact 50x34T, Press-fit BB".

    At first I thought we were talking about the sram pressfit 30 standard but a quick look at google lead me to the park tool blog talking about a "shimano pressfit" standard which doesn't have a real name and can also be called BB86/BB90 or BB92.

    What should I expect from a "pressfit" bottom bracket shell ? Are "pressfit 30" and "pressfit" the same system ?

    Another google search "pressfit bottom bracket" lead me to these bottom brackets options:
    -SRAM Bottom Bracket BB30 Pressfit 30
    -SRAM Press Fit GXP BB
    -Truvativ GXP Team Adapter Cups Bb86 Press Fit Road
    -FSA BB86/92 Bottom Brackets 230-6010
    -Shimano SM-BB71 Press Fit Road Bottom Bracket with Inner Cover
    -Shimano Bottom Bracket Cups Press Fit 7800/7803 | Pair Lh & -
    -Shimano Bottom Bracket Cups Press Fit 7800/7803

    I'm a bit confused but my conclusions is this :
    -sram pressfit 30 and shimano pressfit are different standards.
    -the frame I'm looking at (cube agree pro) is using the shimano pressfit standard
    -I can't use a BB30 crank with this
    -If I want to use a shimano crank I need a shimano pressfit BB like the SM-BB71 above.
    -If I want to use a Sram crank I need to choose a GXP crank and buy a BB86 to GXP BB adapter similar to the truvativ one (avoiding the sram press fit gxp bb). Same thing for FSA with a pressfit/BB86 to megaexo adapter or campy with a Power or Ultra-Torque OS Fit pressfit adapter.

    Am I right ?

  2. #2
    Steaming piles of opinion
    Reputation: danl1's Avatar
    Join Date
    Jul 2005
    Posts
    10,524
    I am no help, in terms of a definitive answer, but I believe you have it all correct. The bit I'm unsure about is the finer details of what adapter / etc might or might not be needed to use SRAM.
    A good habit is as hard to break as a bad one..

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