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  1. #1
    live free or die trying humancongereel's Avatar
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    weird chainring issue...

    i think someone else might have posted about this maybe a month or so ago. i'm not sure, though.

    i biult up a fixed mtb maybe 2 or 3 months ago and things were going great for quite some time. the other day i take it to the co-op to put brakes on, since i'm throwing a freewheel on the flip side of the hub. i noticed there that all my chainring bolts had somehow come all the way loose, nearly falling out. tighten 'em, no biggie.

    today i was taking a 20 mile ride and 10 in we pulled over. my chain tension felt bad, so i reached down to adjust it--it wasn't the tension. it was the bolts. one's gone.

    what the hell is going on?

    oh, and it's bulletproof cranks, rocket ring, and pyramid bmx bolts.
    have:ea50 flats, black, light, stiff.
    144 bcd 3/32" 49t sugino track chainring, possibly 75.

    want: risers, light, stiff, 1", black if that can be
    144 bcd 46t or 47t chainring any kind or width

  2. #2
    NJS my life! roughrider504's Avatar
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    I had that problem a while back, I just loctite'ed them.

  3. #3
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    Quote Originally Posted by humancongereel
    i think someone else might have posted about this maybe a month or so ago. i'm not sure, though.

    i biult up a fixed mtb maybe 2 or 3 months ago and things were going great for quite some time. the other day i take it to the co-op to put brakes on, since i'm throwing a freewheel on the flip side of the hub. i noticed there that all my chainring bolts had somehow come all the way loose, nearly falling out. tighten 'em, no biggie.

    today i was taking a 20 mile ride and 10 in we pulled over. my chain tension felt bad, so i reached down to adjust it--it wasn't the tension. it was the bolts. one's gone.

    what the hell is going on?

    oh, and it's bulletproof cranks, rocket ring, and pyramid bmx bolts.
    Just needs a lil' spit, polish and and a big ole net.
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  4. #4
    All around nice guy BRANDUNE's Avatar
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    Make sure your nuts are good and greazy I've heard that helps

  5. #5
    Senior Member abeyance's Avatar
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    I had a similar experience with mine, only the bolts either loosened or broke, probably from loosening to the point where the chainring was able to shear the bolt off. I lost 3. It looks like you were smarter and caught the problem faster.

    Also make sue you are getting bolts that tighten down far enough, it would be my guess that bmx chainrings are thicker than the one you are using. Maybe not enough of the threads are engaged.

    But loctite will fix it.
    not banned anymore

  6. #6
    MFA jjvw's Avatar
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    Are your bolts too long for your chainring/crank combo? I had to file down the female part of mine so the bolt/sleeve assembly wouldn't bottom out before the chainring was actually bolted on tight.
    <---------------------------------------------------------------------I once caught a signature THIS BIG--------------------------------------------------------------------->

  7. #7
    Team Beer Cynikal's Avatar
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    Make sure you bolt them down with grease and don't tighten them in a circular pattern. Tighten like lugnuts.
    I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC

  8. #8
    live free or die trying humancongereel's Avatar
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    ^^yeah, in a pentagram.

    but the odd part to me is that it was fine for months before i had a problem, and suddenly, i lose a bolt.

    maybe loctite...the less powerful, i think it's blue, right?

    as far as the bolt length, sounds reasonable, but i think the problem would have presented itself much sooner.
    have:ea50 flats, black, light, stiff.
    144 bcd 3/32" 49t sugino track chainring, possibly 75.

    want: risers, light, stiff, 1", black if that can be
    144 bcd 46t or 47t chainring any kind or width

  9. #9
    Senior Member
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    How long were you riding the cranks with loose chainring bolts? It's possible that you turned the circular holes into slightly uncircular holes, so they'll come loose frequently.

  10. #10
    Team Beer Cynikal's Avatar
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    ^The story of my life.
    I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC

  11. #11
    It's an old photo Boss Moniker's Avatar
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    The best solution I could imagine short of replacing both your cranks and chainring, would be to get new chromoly bolts, BMX or whatever. Alloy bolts are **** in general, I cracked one just the other day. Plus you should feel much more confident torquing down on a steel bolt. Blue loctite is a very good idea, and make sure to check frequently. Also, your chainring may be mounted funny... usually a part is recessed so that either the head or the nut-side can fit into it.. make sure this is actually happening, because if it's the side that is in contact with the spider, you're losing clamping surface area.
    Quote Originally Posted by dutret View Post
    Just because I'm not angry anymore doesn't mean I don't think bossmoniker and every other hipster **** I see riding around on aerowheels isn't a piece of **** thats only use is to be an easy target for ridicule.

  12. #12
    live free or die trying humancongereel's Avatar
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    i don't think that's the case, but i'll take a look.
    have:ea50 flats, black, light, stiff.
    144 bcd 3/32" 49t sugino track chainring, possibly 75.

    want: risers, light, stiff, 1", black if that can be
    144 bcd 46t or 47t chainring any kind or width

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