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Interesting fatigue test.....(7 posts)

Interesting fatigue test.....Tim Field
Jul 3, 2002 2:21 AM
http://www.red-kite.co.uk/news/Frametest.html

Take a look if you get the time.

Cheers, Tim
re: Interesting fatigue test.....PsyDoc
Jul 3, 2002 5:22 AM
Keep in mind that this test was done about 5 1/2 years ago and some the frames tested have undergone changes. For example, Merlin has moved the cable adjusters to the headtube where there is more strength. I would like to see more uniformity in such tests where the same frame size is tested.
re: Interesting fatigue test.....TJeanloz
Jul 3, 2002 5:30 AM
In all the years of looking at that test, I hadn't noticed that they tested different size frames. That really does throw a monkey wrench of doubt into the whole thing. They can't possibly claim it as good science when such an obvious contol is lacking. Unless, however, they are giving the nominal sizes, and each of those bikes fits the same size person- which I doubt, considering the range they used.
re: Interesting fatigue test.....divve
Jul 6, 2002 12:00 AM
That would only be beneficial if there was a direct correlation between frame size and fatigue strength, and it would have to be the same correlation between all manufacturers. Obviously, from the results such a correlation doesn't exist. Here's some more info regarding the EFBe testing: http://www.efbe.de/eveloctr.htm and http://www.efbe.de/erenn.htm

Worth noting however, is that the great majority of frames will never see use to their fatigue limits. Even if your frame only passes the basic test, most if not all riders in the "normal" weight category, shouldn't have to let it influence their bike purchase.
It is however, very reassuring if you happen to have a frame that did very well in such a test. To me it shows how much care has been taken from the design stage all the way to manufacturing...but of course to most riders a bike is more than just strength and the sum of its parts...
How could they be uncorrellated?TJeanloz
Jul 8, 2002 4:12 AM
If you deflect a BB shell a fixed amount, say 2cm, on a 48cm and a 62cm bike, the tubes on the 62cm bike would absorb much more of that flex- much more stress would be put on the welds of the 48cm.
Makes me feel good about riding carbon fiber!Quack
Jul 3, 2002 7:55 AM
Makes me feel good about riding carbon fiber!speedisgood
Jul 3, 2002 10:16 AM
As long as it's WELL DESIGNED CF! :)