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Clydesdales/Athenas (200+ lb / 91+ kg) Looking to lose that spare tire? Ideal weight 200+? Frustrated being a large cyclist in a sport geared for the ultra-light? Learn about the bikes and parts that can take the abuse of a heavier cyclist, how to keep your body going while losing the weight, and get support from others who've been successful.

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Old 10-07-08, 08:39 PM   #1
Tom Stormcrowe
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I sheared my chain ring bolts today!

Riding the fixed gear. Talk about an ouch! I made contact with the stem with a very sensitivee area of my anatomy and have no idea how I avoided a faceplant! Chain ring came off the crank and I basically dropped the chain and went from a sprint to recovery in an instant. I will say my voice was higher pitched than Geddy Lee's singing voice while I was cussing a blue streak! .

How much force does it take to shear track chainring bolts and mount hubs?
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Old 10-07-08, 08:46 PM   #2
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401 watts, Tom.
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Old 10-07-08, 08:52 PM   #3
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Steel or aluminum? I placed aluminum bolts on our tandem cause the color matched the bike. Thought it was cool till we sheared 2 of them!

Glad the nutty buddies survived!
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Old 10-07-08, 08:53 PM   #4
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I think someone is putting something in your morning coffee, Tom. Glad to hear you weren't seriously injured.
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Old 10-07-08, 08:59 PM   #5
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Steel track bolts, Beanz. Grade 8 Tempered steel. Same with the inserts.
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Steel or aluminum? I placed aluminum bolts on our tandem cause the color matched the bike. Thought it was cool till we sheared 2 of them!

Glad the nutty buddies survived!
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Old 10-07-08, 09:00 PM   #6
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It's hard to imagine that human force could shear those bolts unless they were perhaps a tad bit loose to begin with. Maybe they backed themselves out a little? Or I suppose you could just be superhuman!
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Old 10-07-08, 09:02 PM   #7
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Steel track bolts, Beanz. Grade 8 Tempered steel. Same with the inserts.

Then you Da Man!
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Old 10-07-08, 09:04 PM   #8
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you was robbed and got crap metal. they just do not break
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Old 10-07-08, 09:08 PM   #9
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I suppose it's possible, but they were retorqued just a few days ago with a torque wrench to 95 inch/pounds Shimano specs for a steel bolt).

As to superhuman, nope, not at all.

Maybe one was flawed and when it went, they cascade failed?
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It's hard to imagine that human force could shear those bolts unless they were perhaps a tad bit loose to begin with. Maybe they backed themselves out a little? Or I suppose you could just be superhuman!
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Old 10-07-08, 09:14 PM   #10
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When I read the title my brain saw that you "shared" your bolts, and I thought geez what a nice guy. Then I read the post and got a little tummy ache, same thing happened to me when I broke a very old chain on my MTB. It now has a new SRAM and my boys appreciate it.
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Old 10-07-08, 10:51 PM   #11
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Congrats, Tom. If it weren't bedtime, I'd make you up a "Bolt Shearing" or "Glad you saved the twins" award.

I'd love to see the look on the faces at Hodson's when they hear about this one!
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Old 10-08-08, 12:39 AM   #12
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Glad you are OK!

As far as why they sheared, maybe you have a colleague structural engineer in your school? I would suspect the retorquing as of know.

But, still, they should not shear.
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Old 10-08-08, 01:32 AM   #13
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I think someone is putting something in your morning coffee, Tom. Glad to hear you weren't seriously injured.
+2

Glad your okay, Mr. Tom "Legs of Steel" Stormcrowe.
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Old 10-08-08, 07:36 AM   #14
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Yeotch, hopefully you were wearing padded shorts or tights. My boys ached just reading that.
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Old 10-08-08, 07:41 AM   #15
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Holy crap Tom.
Hope you're OK
I think that I told you to be carefull with that thing.
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Old 10-08-08, 07:46 AM   #16
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I suppose it's possible, but they were retorqued just a few days ago with a torque wrench to 95 inch/pounds Shimano specs for a steel bolt).

As to superhuman, nope, not at all.

Maybe one was flawed and when it went, they cascade failed?
Pardon my ignorance, but are these new bolts, or are they original to the 35 year old bike?
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Old 10-08-08, 08:26 AM   #17
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Shearing chainring bolts with your pedaling fury- you have truely raised the bar for all of us clydes who ride fixed gear bikes!

Did it shear all 4/5 bolts or just enough to "drop" the chainring?

You sir, are hardcore.
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Old 10-08-08, 11:53 AM   #18
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Maybe one was flawed and when it went, they cascade failed?
Bingo. They'd be spec'd to take the forces from pedaling and normal bike movement, but if one failed the shock to the others at a moment of very high torque (a sprint, were you standing too?) was way more than they were designed to take. Tempered steel is hard and strong but prone to fracture due to brittleness, as compared to say annealed steel (which is softer and weaker).

Perhaps finding a more reputable manufacturer would be a wise move, considering your near-miss with eunuch-hood!
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Old 10-08-08, 11:54 AM   #19
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Steel track bolts, Beanz. Grade 8 Tempered steel. Same with the inserts.
eeeeeeeeeyikes!!!!
(Though we did think your gear ratio was way high.)
I hereby dub thee "King of Torque!"
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Old 10-08-08, 01:38 PM   #20
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They didn't shear. After all the abuse from that gigantic gear you're pushing on that bike, they saw their chance and tried to escape.
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Old 10-08-08, 01:39 PM   #21
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YOU DA MAN !!!! If you can generate that kind of torque, I'll bet you can do this:

http://www.youtube.com/watch?v=6GNB7xT3rNE

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Old 10-08-08, 02:08 PM   #22
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+2

Glad your okay, Mr. Tom "Legs of Steel" Stormcrowe.
More like kahuna's of steel
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Old 10-08-08, 04:20 PM   #23
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Pardon my ignorance, but are these new bolts, or are they original to the 35 year old bike?
New bolts, retorqued just a few days ago. The bike is a conversion from a road bike, it used to have a double chain ring. Now it has a new crank and sealed bottom bracket.

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Bingo. They'd be spec'd to take the forces from pedaling and normal bike movement, but if one failed the shock to the others at a moment of very high torque (a sprint, were you standing too?) was way more than they were designed to take. Tempered steel is hard and strong but prone to fracture due to brittleness, as compared to say annealed steel (which is softer and weaker).

Perhaps finding a more reputable manufacturer would be a wise move, considering your near-miss with eunuch-hood!
The bolts I have in now are track spec bolts from Shimano. They meet aviation standards as well for high torque apps......
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Old 10-08-08, 04:22 PM   #24
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There were a couple of chins on the floor....

By the way, I put a 17 tooth cog on the back, 98 was fun, but not as good for sprint and slow down riding I do on campus. I'm running 68 GI now.

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Congrats, Tom. If it weren't bedtime, I'd make you up a "Bolt Shearing" or "Glad you saved the twins" award.

I'd love to see the look on the faces at Hodson's when they hear about this one!
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Old 10-08-08, 05:54 PM   #25
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Tom, If you are man enough to shear those bolts, I'd check the stem on your bike and make sure you didn't dent it.....
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