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I'm looking at getting a CAAD9. I've read that unlike steel or carbon, aluminum will eventually fatigue and fail. How long would this likely take? Is it the kind of thing where it could realistically fail in 5 years, or is it the kind of thing where it would take 50 years of hard riding to fail?
 

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ahh jeez. propaganda, or should i say its a prejudice against alu from the carbon and steel folks... any decent design will not see this be a factor in your lifetime...

anyways, u said u're looking at a caad9. lifetime warantee. Ride it and be happy.
 

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Agreed

wankski said:
ahh jeez. propaganda, or should i say its a prejudice against alu from the carbon and steel folks... any decent design will not see this be a factor in your lifetime...

anyways, u said u're looking at a caad9. lifetime warantee. Ride it and be happy.
+1...
 

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LeDomestique said:
I still have my 1998 F500 with many many many miles on rough terrain. No sign of cracks yet.
and I still have my 1995 F700 (which I received in July '94)!
 

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Naso Unicornis
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I've had my CAAD4 R800 since 2002. Since then, I've averaged about 2,000-2,500 miles per year. It's had a close encounter with the top of my garage on my car roof racks and it's still rolling. After so long, I still smile at the brute acceleration of my CAAD4.

There's no reason the bike shouldn't last for many years, if properly used and maintained. Have no fear of buying aluminum, especially from a company that specializes in manufacturing bikes with it.

CHL
 

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eRacer
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My 1978 Cannondale SR900 is still going strong.
I've got the 'wrinkles', but the Cannon shows no signs of getting old.
 

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LA CHEVRE
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It may be true for pure aluminum (which is never used for bikes) or early alu-based alloys but current alloys are pretty durable... and from a company that has so many years of experience with the material like Cannondale? Not a concern IMO...
 

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This is a silly question...

Barring design/manufacturing flaws...frames of any material will generally last until broken or wrecked in any episode that exceeds the capacities they are originally designed for....

unfortunately most human bodies will (like carbon) catastrophically fail when crashed and over time *fatigue* much faster than a CAAD:

ALUMINUM B52 Bombers (last produced in 1962) are being flown by the grandchildren of the original B52 Pilots and are scheduled to remain in military service until 2040

bang for buck CAAD's are the *$H1T* my lovie...
 

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Here here! I am a happy current owner of a CAAD4 r800 and have ridden it hard for 3 years (commuting and recreation) prior to that it was owned by a Good fellow at our best LBS Smoothcycle. I can't imagine he did not ride the balls off it.
Still going strong.
I have and further intend to upgrade parts but don't really feal the need for a new frame.
 

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geez, guys, if you debunk the aluminum fatigue myth then how will you justify the purchase of a new frame to your significant others? i mean, "catastrophic failure" went along way to getting me on the saddle of a new system six.
 

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My late 80's Cannondale 3.0 is still going strong. It gets about 2-3K miles a year. Most of those miles I am pretty close to 200lbs.
 

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LA CHEVRE
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pomole said:
geez, guys, if you debunk the aluminum fatigue myth then how will you justify the purchase of a new frame to your significant others? i mean, "catastrophic failure" went along way to getting me on the saddle of a new system six.
We're hoping they dont come here...
 

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It will start to creak and make strange noises before it ever fails.

20 years of hard use, and you might get some creaks.

This one is 13 years old and no problems yet.
 

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LA CHEVRE
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Now THAT is funny, using a Livestrong article to bring a myth to light.... :D
So what's wrong with Livestrong? I always thought quite highly of them...It is true that aluminum has fatigue issues. We just don't know the extent to which these issues exist!
 

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I have a 2010 CAAD9 with about 8,000 miles on it. I wish the frame would give out so I could have a excuse to buy a new one....not a sign of wear on it yet.
 

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I have a 2010 CAAD9 with about 8,000 miles on it. I wish the frame would give out so I could have a excuse to buy a new one....not a sign of wear on it yet.
Then that's great news! :thumbsup:
 

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Lost in Space...
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@zeet, have you actually experienced a failure of aluminum or are you just obsessed with the idea that aluminum is somehow inferior? My personal experience was several C'dale frames from the 90's has been nothing short of spectacular. That said, I'd rather ride one of my steel bikes as a personal preference (they are lighter and I have more money invested in them). Aluminum is fine unless you wreck it.
 
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