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Thread: carbon longevity
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09-04-2020, 11:10 PM #1
carbon longevity
hey materials scientists... I have a 10 year old carbon bar on my hardtail. lots of miles. A salsa moto, if curious. While riding today, I started thinking.... man, that would really suck if my bar failed. I dont suspect fatigue failure is something to worry about in the classical sense, but what's the general consensus... swap out high risk carbon parts after a lot of use? or just let my mind wander to other catastrophic topics while on long rides.
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09-04-2020, 11:28 PM #2
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09-04-2020, 11:55 PM #3
Interesting question. Do you have the same concerns for carbon roadie forks? Curious...
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09-05-2020, 12:12 AM #4
Not an engineer, buuuut... I was told five years is a good lifetime for cockpit parts on mtb regardless of material, and I stick to that. New bar and stem is a lot cheaper than teeth.
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09-05-2020, 08:30 AM #5
why would bar vs frame failure be any more / less likely to happen?
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09-05-2020, 08:37 AM #6Registered User
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A handle bar is an unsupported lever in an pretty important application and if it fails in use it might not be good where as I think mostly a frame will crack
I have seen a poorly designed aluminium frame break entirely in half but its less likely to fail CatastrophicallyLee Lau - xxx-er is the laziest Asian canuck I know
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09-05-2020, 09:02 AM #7
You could run a full stress analysis which would likely cost more than new bars. I am an aerospace engineer so you can trust me.
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09-05-2020, 09:27 AM #8
I would probably replace but would be more concerned about 10 year old aluminum bars you had been sweating on for 10 years. If you've ever seen a sweat corrosion failure on an aluminum bar and stem you'll understand why.
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09-05-2020, 09:28 AM #9Registered User
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This. I just heard a story from a old timer at my local bike shop where his 10+ year old carbon bars crumpled under his weight. Luckily it wasn't while riding and it happened while he was stopped. So, no new teeth involved, just a bruised chin. You've got your money's worth out of those ones. Get some new ones and let your mind wander elsewhere during your rides.
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09-05-2020, 11:17 PM #10
Not really. and not really worried about frame failures either. A bar seems to take loads more consistently applied in the same place (concentrated at the edges of the stem clamps I'm guessing) and direction, vs a fork or frame. As XXX-er said I think the unsupported lever aspect matters also comparatively. Also probably matters that you can look down and see it flexing too
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09-05-2020, 11:20 PM #11Besides the comet that killed the dinosaurs nothing has destroyed a species faster than entitled white people.-ajp
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