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Old 07-26-2013, 10:10 AM   #1
Lam3
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Default Older wheels and fatigue (?)

So I was thinking of picking up a set of used older wheels and was a little concerned about their expected service life. I'm looking at a set of SSR type-c competitions, which are a very lightweight forged aluminum wheel (but now they're probably 7-8 years old). Do wheels have an expected life when designed? Aluminum fatigues in a constantly degenerative manner, put it through enough stress cycles and eventually it will break (as opposed to ferrous metals). I'm sure wheel manufacturers are aware of this and design safe products for their intended lifetime, which is why I ask if there is one? Are there general rules of thumb on this kind of stuff? I'm sure I'll be looking into it more myself, but figured I'd ask if anyone else had thoughts one way or another. Thanks in advance!
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Last edited by Lam3; 07-26-2013 at 10:11 AM. Reason: grammer nazis were coming...
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Old 07-26-2013, 11:18 AM   #2
sc00by4life
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you're making a big deal out of nothing.
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Old 07-26-2013, 11:29 AM   #3
T-37
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I wouldn't be worry about it on an SSR, unless there are obvious concerns like bends from potholes or excessive curbing.

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Reason: grammer nazis were coming...
You spelled "grammar" wrong.
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Old 07-26-2013, 01:33 PM   #4
Luke@tirerack
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all metals fatigue .... I would worry more about how they were used than how old they are or how they were designed. There is no typical "life cycle" rule of thumb on wheel age. I know I wouldn't buy a set of used wheels from somebody that ran r-compound tires on them every season for 8 years
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Old 07-26-2013, 02:23 PM   #5
Patrick Olsen
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You spelled "grammar" wrong.
I'm pretty sure that was on purpose.
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Old 07-29-2013, 09:45 AM   #6
Lam3
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Thank you guys for the input, I do appreciate it. I'm somewhat on the fence about it, but I do trust SSR. I'll talk to the owner and see what's what and how they were used, but I think you've convinced me it's a non-issue.

And all metals do fatigue, but ferrous metals (and titanium) have a fatigue limit which they will not deteriorate past, whereas the others will continue to weaken until failure. How long that takes depends on the level of stress in the part, which could be calculated, but ain't nobody got time fo dat.

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I'm pretty sure that was on purpose.
Easter eggs
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