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Installing external bb cups with no bb tool

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  • 12-07-2011 11:47pm
    #1
    kumate_champ07
    Closed Accounts Posts: 7,150 ✭✭✭


    I just fit an Sram gxp crankset, I installed the cups by hand, then fit the cranks. Theres no play at all so it seems good to go.
    Should I wait till I get the right tool or is it fine?


Comments

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    #2
    Morgan
    Registered Users Posts: 2,481 ✭✭✭Morgan


    At the very least I'd expect it to creak like mad. BB cups have the highest torque requirements of any fixing on the bike (off the top of my head), hand-tight won't cut it.


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    #3
    Lumen
    Registered Users Posts: 31,058 ✭✭✭✭Lumen


    ..second only to the damn cranks.

    http://bicycletutor.com/torque-specifications/

    GXP BB
    33.9-40.1 Nm
    300-360 in lbs

    Powerspline cranks
    38-42 Nm (actually my SRAM Red cranks say 48-54)
    336-372 in lbs

    (goes off to tighten creaky BB)


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    #4
    kumate_champ07
    Closed Accounts Posts: 7,150 ✭✭✭kumate_champ07


    I do have a very strong grip tho, Ill buy the tool today for peace of mind.


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    #5
    Lumen
    Registered Users Posts: 31,058 ✭✭✭✭Lumen


    kumate_champ07 wrote: »
    I do have a very strong grip tho, Ill buy the tool today for peace of mind.

    If you had enough grip to generate 40nm on a BB cup you would probably rip your skin off. I tried it once with a strap wrench and that wasn't enough.


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    #6
    GTDolanator
    Registered Users Posts: 772 ✭✭✭GTDolanator


    meh if your not going to get upset by a few scratches just use a pipe grips,thats all ive ever used with externals and i dont get no creaking or coming loose and im on the bike everyday


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    #7
    C3PO
    Registered Users Posts: 3,753 ✭✭✭C3PO


    GTDolanator wrote: »
    meh if your not going to get upset by a few scratches just use a pipe grips,thats all ive ever used with externals and i dont get no creaking or coming loose and im on the bike everyday

    Or maybe just a hammer and bolster chisel would do the job? :rolleyes:


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