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From: Zen Cycle <funkmaster@hotmail.com>
Newsgroups: rec.bicycles.tech
Subject: Re: Odd failure
Date: Wed, 10 Jul 2024 09:04:58 -0400
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On 7/9/2024 10:23 PM, Frank Krygowski wrote:
> At the start of yesterday's club ride, a good friend had taken her bike 
> out of her hatchback as usual, slipped the front wheel into the forks as 
> usual, and tightened the quick release. She said she heard a "ping." 
> Then her quick release felt funny, in that it had lost it's "over 
> center" clamp action.
> 
> Several guys fussed with it, trying to determine what had gone wrong. 
> The fundamental clamp action still worked, just not the over-center 
> action. We pulled the skewer out and saw no visible problem.
> 
> Ultimately, we clamped it, pounded as hard as we could on the top of the 
> tire as she held up the front wheel, pushed as hard as possible side to 
> side on the wheel, and proclaimed it rideable.
> 
> She completed the 35+ mile ride just fine with the wheel still tight in 
> the forks. But I suggested she follow me home so I could donate a spare 
> skewer, plus take hers apart to see what might have happened in there.
> 
> When I disassembled the skewer's lever action, here's what I found: The 
> left or lever end of the skewer features a steel cylinder maybe 1/2" 
> diameter and ~1/2" long, drilled with a transverse hole ~3/8" diameter. 
> The circular eccentric surface of the lever operates inside that hole, 
> applying leftward force to put the skewer in tension. (Most of us 
> probably knew all that.)
> 
> In her case, the metal between the side wall of the transverse hole and 
> the outer surface of the 1/2" cylinder failed in tension, doubtlessly 
> due to fatigue. That caused enough deformation to remove the over-center 
> action. The other side wall held and provided clamping tension. I think 
> it was important that the cylindrical end piece is a pretty close fit in 
> the thick chrome "nut" in which the lever pivots, so serious bending 
> action on the remaining metal wasn't possible.
> 
> I'd never seen that sort of failure before, and neither had my bike 
> mechanic buddies. I wonder if others here (especially Andrew) had.
> 

Not here, I've only ever seen the skewer shaft snap
-- 
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