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  1. #1
    Mission Creep wmgreene85's Avatar
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    Losing sleep over my SRAM Omniums

    Its been a while since I have posted anything... but I know this forum is full of priceless information- and right now I need some of that...

    I putting together a track bike and purchased some SRAM Omnium cranks and BB. I installed the BB no problem but am having some trouble with the cranks.

    I can line everything up just fine, but when I go to tighten my crank arm down to the spindle I am getting about 2mm of play (at least). As per the instructions, I have greased, and re-greased.

    However, as I was laying in my bed trying to figure out the problem I realized that it may be my tools. I am using a "multi-tool"; the kind that has maybe 4 hex wrenches, along with a screwdriver, etc. The length of the tools are around 4 inches.

    The required torque to tighten the cranks is around 55 Nm (or 155 pounds per inch).

    Could it be that my multi-tool wont give me that much torque without feeling like its going to shatter?

    I am planning in taking it to a bike shop tomorrow. But would like to know anyone's thoughts on this... as I am losing sleep over it!

    Thanks...

  2. #2
    Senior Member Adrian_'s Avatar
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    No matter how hard I tried to tighten them I had the same amount of play on both my S300's and Omniums. I gave up and rode them both for months with no problems.
    Who needs a sig....oh wait.

  3. #3
    Elitist carleton's Avatar
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    Take it to the shop and ask them which tool you need to do the job correctly.

    3 problems solved:
    - Your crank situation
    - Your confidence
    - Your bike mechanicing knowledge

  4. #4
    Morton Nagrom_'s Avatar
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    Did you use the proper BB installation tool?

    I'd also use a torque wrench.
    Quote Originally Posted by seau grateau View Post
    No offense but you're an idiot.
    PedalRoom

  5. #5
    Elitist carleton's Avatar
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    Oh and go to your favorite hardware store and buy a set of long metric allen wrenches ($10?). You will find them very useful over several years...even with IKEA furniture....especially with IKEA furniture.

  6. #6
    モㄥ工匕モ 爪モ爪乃モ尺 evilcryalotmore's Avatar
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    Ikea makes there own allen set now :\ my bed has 5.3 mm allen its not standard or metric, but anways carelton is right, a couple of long metric allen's will be better when ur multitool, plus u need the torque

  7. #7
    Morton Nagrom_'s Avatar
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    My bed uses standard 3/4" bolts because it was made in america.
    Quote Originally Posted by seau grateau View Post
    No offense but you're an idiot.
    PedalRoom

  8. #8
    Just smang it. EpicSchwinn's Avatar
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    Quote Originally Posted by carleton View Post
    Oh and go to your favorite hardware store and buy a set of long metric allen wrenches ($10?). You will find them very useful over several years...even with IKEA furniture....especially with IKEA furniture.
    Amen to this. Go to harbor freight and buy two sets for about $20. You're going to lose your 6 and 5mm ones non stop so it's nice to have an extra set.

    Quote Originally Posted by Nagrom_ View Post
    My bed uses standard 3/4" bolts because it was made in america.
    Thomson bed?

  9. #9
    Morton Nagrom_'s Avatar
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    Quote Originally Posted by EpicSchwinn View Post
    Thomson bed?
    My mattress covers some of the bedpost, so Thomso or Homson depending on which side you're looking.
    Quote Originally Posted by seau grateau View Post
    No offense but you're an idiot.
    PedalRoom

  10. #10
    Lost AngryScientist's Avatar
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    i will tell you that GXP based cranksets do require a lot of torque to be tightened correctly, i doubt you could generate enough to tighten them properly with a small multi-tool. the other issue, which i will mention over and over is that the BB shell needs to be prepped properly, i doubt it's your problem here, but the shell should be faced, or at least ensure that the mating surface is free of paint, flat and at a 90* angle. also, of course, the bb shell width must be correct and within tolerance.

    as carleton mentioned - go to a LBS.

  11. #11
    Senior Member Bat56's Avatar
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    Quote Originally Posted by Adrian_ View Post
    No matter how hard I tried to tighten them I had the same amount of play on both my S300's and Omniums. I gave up and rode them both for months with no problems.
    I built my entire bike with a multi tool. I rode it for months with no problems.











    But one day everything fell apart.

  12. #12
    Cat Enthusiast ddeadserious's Avatar
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    I've put a handful of bikes together with my multitool, including GXP cranks on a few. It definitely takes a good amount of torque, maybe even a little ham-fisting, when installing for the first time.



    Ham-fisting sounds really gross. Sorry.
    ALL CITY NATURE BOY

  13. #13
    Senior Member Adrian_'s Avatar
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    Quote Originally Posted by ddeadserious View Post
    McHam-fist
    Sounds like something that would sell big at Mcdonalds.
    Who needs a sig....oh wait.

  14. #14
    Blaster of Reality Scrodzilla's Avatar
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    As others have said, you are never going to get enough torque to properly install Omniums with a multi tool and I seriously doubt you'll even get enough using a standard allen wrench (which is most likely why so many people have "problems" installing them).

    You don't necessarily need to use a torque wrench because you will be able to feel when there is no more play from side to side but get yourself an 8mm allen socket (1/2" drive) and use a ratchet or breaker bar.

  15. #15
    Mission Creep wmgreene85's Avatar
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    I purchased an 11$ parktool that had an 8mm hex wrench on it. problem solved. thanks everyone...
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