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  1. #1
    THE STUFFED Leukybear's Avatar
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    Omnium chainring swap question....

    So today I went to swap out the stock 48T chainring that came stock with my new omniums with a 46T sugino zen from my parts bin; just to find the stock chaining bolts are too long and the chainring sits loosely on the crank.

    Doing some homework online, I realized I need to use different chaining bolts; can anyone confirm that these in the link below would work for this combo?

    http://www.treefortbikes.com/cat/0/3...22346839___479
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  2. #2
    Senior Member Deshi's Avatar
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    Confirmed.
    Quote Originally Posted by PedallingATX View Post
    dude...you can't "no ****" something THAT ****. That's like saying "sometimes I just like to make out with dudes...no ****"

  3. #3
    Elitist carleton's Avatar
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    Actually...

    Those won't work well. There will not be much thread gripping. Maybe 1 or 2 turns.

    Here's the solution I came up with:

    - Buy two sets of steel chainring bolts. One set of singles (as in the link above) and one set of doubles. Doubles are used by mountain bikers. Easily found in any shop that caters to that crowd.
    - Use the backs from the singles and insert them into the crank arm and use the fronts from the doubles. They will stick through the back about 1-2mm, but they won't touch your chainstays.
    - This way you get full thread engagement instead of 1 or 2 threads engaged. I use this system on my race bike.
    Last edited by carleton; 10-10-10 at 09:03 PM.

  4. #4
    GONE~
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    Incidentally, that's the same system I use.

    Found them bolts at the bike co-op.

  5. #5
    Elitist carleton's Avatar
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    Quote Originally Posted by vixtor View Post
    incidentally, that's the same system i use.
    gmta!

  6. #6
    GONE~
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    Last edited by Squirrelli; 10-10-10 at 09:32 PM. Reason: Previous high five disappeared...

  7. #7
    Senior Member Deshi's Avatar
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    Iv run SS chainring bolts on every one of my single speeds with out a single issue. Have not broke one yet nor had one come loose.
    Quote Originally Posted by PedallingATX View Post
    dude...you can't "no ****" something THAT ****. That's like saying "sometimes I just like to make out with dudes...no ****"

  8. #8
    Senior Member Kayce's Avatar
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    Do any of them have omnium cranks? They are having lots of problems with the proprietary bolts.

  9. #9
    THE STUFFED Leukybear's Avatar
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    Quote Originally Posted by carleton View Post
    Actually...

    Those won't work well. There will not be much thread gripping. Maybe 1 or 2 turns.

    Here's the solution I came up with:

    - Buy two sets of steel chainring bolts. One set of singles (as in the link above) and one set of doubles. Doubles are used by mountain bikers. Easily found in any shop that caters to that crowd.
    - Use the backs from the singles and insert them into the crank arm and use the fronts from the doubles. They will stick through the back about 1-2mm, but they won't touch your chainstays.
    - This way you get full thread engagement instead of 1 or 2 threads engaged. I use this system on my race bike.
    Great stuff!
    Seriously going to consider this.
    pɐǝɹ oʇ sᴉ sᴉɥʇ ƃuᴉʎouuɐ ʍoɥ ǝǝs

  10. #10
    Elitist carleton's Avatar
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    Quote Originally Posted by Deshi View Post
    Iv run SS chainring bolts on every one of my single speeds with out a single issue. Have not broke one yet nor had one come loose.
    Yeah, I've run single chainring bolts on Dura Ace, Campagnolo Record, and SRM cranks. The problem is that with the SRAM Omniums, both the crank arm spider AND the chainring are so thick (TWSS) that they require double chainring bolts. But if you go to a standard chainring, you have to improvise as Vixtor and I did.


    Quote Originally Posted by Kayce View Post
    Do any of them have omnium cranks? They are having lots of problems with the proprietary bolts.
    Exactly

  11. #11
    Senior Member Deshi's Avatar
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    Quote Originally Posted by carleton View Post
    Yeah, I've run single chainring bolts on Dura Ace, Campagnolo Record, and SRM cranks. The problem is that with the SRAM Omniums, both the crank arm spider AND the chainring are so thick (TWSS) that they require double chainring bolts. But if you go to a standard chainring, you have to improvise as Vixtor and I did.
    I ran a Sugino messenger chainring on the ominum crank with standard ss chainring bolts.
    Quote Originally Posted by PedallingATX View Post
    dude...you can't "no ****" something THAT ****. That's like saying "sometimes I just like to make out with dudes...no ****"

  12. #12
    Senior Member bentchamber's Avatar
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    Isnt the messenger chainring 130 BCD?
    vs Omniums are 144 BCD?

  13. #13
    THE STUFFED Leukybear's Avatar
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    Quote Originally Posted by bentchamber View Post
    Isnt the messenger chainring 130 BCD?
    vs Omniums are 144 BCD?
    He must've meant the zen messenger chainrings.
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  14. #14
    quoten fixer
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    you can put the chainring on backwards till the new bolts arrive, should fix the to long bolt issue

  15. #15
    Senior Member Deshi's Avatar
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    Quote Originally Posted by happypills View Post
    He must've meant the zen messenger chainrings.
    Indeed.

    Anyway, to the OP, Do as the others have said. Just cause I didnt have and issue doesnt mean it was safe.
    Quote Originally Posted by PedallingATX View Post
    dude...you can't "no ****" something THAT ****. That's like saying "sometimes I just like to make out with dudes...no ****"

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