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  1. #1
    The Site Administrator: Currently at home recovering from a couple of strokes,please contact my assistnt admins for forum issues Tom Stormcrowe's Avatar
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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?
    on light duty due to illness; please contact my assistants for forum issues. They are Siu Blue Wind, or CbadRider or the other 3 star folk. I am currently at home recovering from a couple of strokes. I am making good progress, happily.


    . “He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you.”- Fredrick Nietzsche

    "We can judge the heart of a man by his treatment of animals." - Immanuel Kant

  2. #2
    BikeForums Founder Joe Gardner's Avatar
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    401 watts, Tom.

  3. #3
    Banned. Mr. Beanz's Avatar
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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!

  4. #4
    zpl
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    Bike Fun Fanatic zpl's Avatar
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    I think someone is putting something in your morning coffee, Tom. Glad to hear you weren't seriously injured.

  5. #5
    The Site Administrator: Currently at home recovering from a couple of strokes,please contact my assistnt admins for forum issues Tom Stormcrowe's Avatar
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    Steel track bolts, Beanz. Grade 8 Tempered steel. Same with the inserts.
    Quote Originally Posted by Mr. Beanz View Post
    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!
    on light duty due to illness; please contact my assistants for forum issues. They are Siu Blue Wind, or CbadRider or the other 3 star folk. I am currently at home recovering from a couple of strokes. I am making good progress, happily.


    . “He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you.”- Fredrick Nietzsche

    "We can judge the heart of a man by his treatment of animals." - Immanuel Kant

  6. #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!

  7. #7
    Banned. Mr. Beanz's Avatar
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    Quote Originally Posted by Tom Stormcrowe View Post
    Steel track bolts, Beanz. Grade 8 Tempered steel. Same with the inserts.

    Then you Da Man!

  8. #8
    50000 Guatts of power 127.0.0.1's Avatar
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    you was robbed and got crap metal. they just do not break
    I like fat bikes
    and I cannot lie.

  9. #9
    The Site Administrator: Currently at home recovering from a couple of strokes,please contact my assistnt admins for forum issues Tom Stormcrowe's Avatar
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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?
    Quote Originally Posted by gearhead82 View Post
    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!
    on light duty due to illness; please contact my assistants for forum issues. They are Siu Blue Wind, or CbadRider or the other 3 star folk. I am currently at home recovering from a couple of strokes. I am making good progress, happily.


    . “He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you.”- Fredrick Nietzsche

    "We can judge the heart of a man by his treatment of animals." - Immanuel Kant

  10. #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.

  11. #11
    Clydeasaurus tomdaniels's Avatar
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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!
    2007 TerraTrike Cruiser (XL) Trike
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  12. #12
    Senior Member scrapmetal's Avatar
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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.
    Po všetkém hovno, enem po včelách med.

  13. #13
    POWERCRANK addict markhr's Avatar
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    Quote Originally Posted by zpl View Post
    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.
    shameless POWERCRANK plug
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  14. #14
    Downtown Spanky Brown bautieri's Avatar
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    Yeotch, hopefully you were wearing padded shorts or tights. My boys ached just reading that.

  15. #15
    NadaKid wayne pattee's Avatar
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    Holy crap Tom.
    Hope you're OK
    I think that I told you to be carefull with that thing.

  16. #16
    Neil_B
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    Quote Originally Posted by Tom Stormcrowe View Post
    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?

  17. #17
    Pants are for suckaz HandsomeRyan's Avatar
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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.

  18. #18
    Senior Member cod.peace's Avatar
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    Quote Originally Posted by Tom Stormcrowe View Post
    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!
    old steel Specialized Hardrock

  19. #19
    Senior Member Jtgyk's Avatar
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    Quote Originally Posted by Tom Stormcrowe View Post
    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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  20. #20
    Gears? CliftonGK1's Avatar
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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.

  21. #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
    Last edited by Bone Head; 10-08-08 at 01:42 PM. Reason: spelling
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  22. #22
    fishologist cohophysh's Avatar
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    Quote Originally Posted by markhr View Post
    +2

    Glad your okay, Mr. Tom "Legs of Steel" Stormcrowe.
    More like kahuna's of steel
    We cannot solve problems with the same level of consciousness that created them. A.E.

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  23. #23
    The Site Administrator: Currently at home recovering from a couple of strokes,please contact my assistnt admins for forum issues Tom Stormcrowe's Avatar
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    Quote Originally Posted by The Historian View Post
    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.

    Quote Originally Posted by cod.peace View Post
    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......
    on light duty due to illness; please contact my assistants for forum issues. They are Siu Blue Wind, or CbadRider or the other 3 star folk. I am currently at home recovering from a couple of strokes. I am making good progress, happily.


    . “He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you.”- Fredrick Nietzsche

    "We can judge the heart of a man by his treatment of animals." - Immanuel Kant

  24. #24
    The Site Administrator: Currently at home recovering from a couple of strokes,please contact my assistnt admins for forum issues Tom Stormcrowe's Avatar
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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.

    Quote Originally Posted by tomdaniels View Post
    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!
    on light duty due to illness; please contact my assistants for forum issues. They are Siu Blue Wind, or CbadRider or the other 3 star folk. I am currently at home recovering from a couple of strokes. I am making good progress, happily.


    . “He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you.”- Fredrick Nietzsche

    "We can judge the heart of a man by his treatment of animals." - Immanuel Kant

  25. #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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