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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 02-04-09, 10:18 PM   #1
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ISIS Drive Crank.. Broken in 5 rides

Well I have a total of 5 rides in on the new SS and I have officially destroyed the ISIS Drive Bontrager Race Lite. The left side of the crank came off after a tough climb. I stopped to look and all the threads on both the Bottom bracket and the crank arm itself we stripped out completely. I have the parts but camera pics arn't the best in the dark Will try and take shots tomorrow. Went to a LBS and picked up a new crank.... hope this one works better!
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Old 02-04-09, 10:55 PM   #2
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this I gotta see
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Old 02-04-09, 11:10 PM   #3
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Old 02-04-09, 11:54 PM   #4
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this I gotta see
Will take pics in daylight
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Old 02-05-09, 07:46 AM   #5
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I've seen it before. Seems ISIS drive isn't very durable.
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Old 02-05-09, 08:23 AM   #6
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I've seen it before. Seems ISIS drive isn't very durable.
So your saying that is why I got the isis cranks so cheap when I ordered my wifes bike. The same cranks with isis that are now on my randoneuring/commuting bike.

Well at least I'm a spinner maybe they'll live a long healthy life
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Old 02-05-09, 08:25 AM   #7
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Quote:
Originally Posted by funrover View Post
Well I have a total of 5 rides in on the new SS and I have officially destroyed the ISIS Drive Bontrager Race Lite. The left side of the crank came off after a tough climb. I stopped to look and all the threads on both the Bottom bracket and the crank arm itself we stripped out completely. I have the parts but camera pics arn't the best in the dark Will try and take shots tomorrow. Went to a LBS and picked up a new crank.... hope this one works better!
I'd suspect an improper torque of the crank bolts which eventually lead to the crank coming off. I'm a bit confused about the threads in the bottom bracket and the extraction threads of the crank both being stripped, if I'm reading this right. The threads in the bottom bracket could strip if the crank wobbled for long enough under high torque but the extraction bolts don't have any function in holding the crank onto the arm.

If you mean that the splines on the crank are stripped, that will happen with a loose crank. Torque your crank bolts...with a torque wrench...to the manufacturer's specs. It solves all kinds of problems. I always use a torque wrench on my cranks and have never had one come loose...never!
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Old 02-05-09, 08:30 AM   #8
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So your saying that is why I got the isis cranks so cheap when I ordered my wifes bike. The same cranks with isis that are now on my randoneuring/commuting bike.

Well at least I'm a spinner maybe they'll live a long healthy life
I disagree with DieselDan's blanket statement...sorry, dude I've had ISIS and Octalink on several bikes and have never had any issue with the mechanism failing or any signs of an inherent weakness of the system.
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Old 02-05-09, 11:02 AM   #9
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Not sure what the overall problem was, just sucks it happened. And it was not that dirty till I dropped it.
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Old 02-05-09, 11:18 AM   #10
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Ok now that I see the pics it looks just like mine or am I missing something.
Edit: Except the very outermost thread seems stripped.
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Old 02-05-09, 12:21 PM   #11
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Not sure what the overall problem was, just sucks it happened. And it was not that dirty till I dropped it.
I see some of my confusion. The crank bolt isn't part of the crank. It's a separate subunit of the bottom bracket and usually comes with the BB.

Although it's devilishly difficult to cross thread that kind of crank bolt, it looks like you (or your mechanic) may have managed it . Alternatively, the bolt may have been loose for a while and the splines allowed the threads to rock against each other until the tops of the threads were flattened and then the crank bolt pulled out.
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