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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 10-09-08, 03:39 AM   #26
vXhanz
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Good lord Tom! I winced reading that! I feel your pain though, I sheared a crank off my old MTB many years ago and bounced off my twins.

Upon closer inspection... the metal was already fatigued as the cast aluminum had a hairline crack in it.

Your bolts may have already been fatigued, got a bad batch of steel, or you over torqued them without knowing it and stripped the head a touch.

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Old 10-09-08, 04:57 AM   #27
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OK, I used a torque wrench, ratchet type. I torqued them to the spec required for the steel ring bolts. The conversion to single speed was done this year, and the bolts were relatively new.

It's very possible the metal was from a bad batch though, and once the bad one failed, the rest cascaded, as I mentioned before.
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Old 10-09-08, 05:28 AM   #28
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Also torguing is a bit of a science. For instance, if you apply any kind of lubricant to the bolt, the original numbers do not apply.

I lube every thread, except those where I have to use locktite (like steering on my jeep) - since I prefer to be able to loosen it up when needed. As far as to tighten, I do it the german way - gutntight - seldom use the book values - like for engine head bolts or flywheel bolts.
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Old 10-09-08, 10:46 AM   #29
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I'm glad that you did not get hurt too bad. It could have been terrible. It takes A LOT of pressure to shear bolts like that. Wow.

I have this picture in my head, for some reason, of Tom unintentionally popping wheelies at every red light, and having to stand and lean forward over the front tire to keep from landing on his butt. That was some power you were laying down, dude!
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Old 10-09-08, 11:23 AM   #30
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WADA will be in touch soon, and your invite to the 09 TdF could be in jeopardy as well.

I think I'll go assume the fetal position and hide in a corner now. OUCH!!!!!!!!!!!!!!!!!!
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