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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 05-28-07, 08:53 PM   #1
humancongereel
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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.
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Old 05-28-07, 09:06 PM   #2
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I had that problem a while back, I just loctite'ed them.
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Old 05-28-07, 09:44 PM   #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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Old 05-28-07, 09:49 PM   #4
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Make sure your nuts are good and greazy I've heard that helps
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Old 05-28-07, 10:00 PM   #5
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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.
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Old 05-28-07, 10:02 PM   #6
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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.
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Old 05-28-07, 10:21 PM   #7
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Make sure you bolt them down with grease and don't tighten them in a circular pattern. Tighten like lugnuts.
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Old 05-29-07, 07:37 AM   #8
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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.
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Old 05-29-07, 07:52 AM   #9
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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.
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Old 05-29-07, 08:09 AM   #10
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^The story of my life.
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Old 05-29-07, 01:18 PM   #11
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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.
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Old 05-29-07, 03:27 PM   #12
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i don't think that's the case, but i'll take a look.
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