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Lifespan of a frame(7 posts)

Lifespan of a framestinkfoot247
May 4, 2003 10:59 AM
I was reading about Chris King headsets outlasting a couple frames which brings me to the question. I got an aluminum frame, whats the typical life span of one and how does a frame "die". thank you.
It really depends on the frame...Matno
May 4, 2003 11:33 AM
What kind of frame do you have?

Some aluminum frames actually come with a lifetime warranty. Others don't seem to last more than about 5 or 6 years... Personally, I've never seen one "wear out" but I know it does happen. Aluminum has a shorter fatigue life than, say, steel and when it "dies" it can be dramatic. Most modern frames will take a lot of abuse for a long time before anything like that happens though.
The completely unanswerable questionKerry
May 4, 2003 3:44 PM
There is absolutely no way to predict the life of a frame. First, there are some generalities that Ti and steel are better materials from a fatigue life standpoint. Neither material will fatigue fail unless you exceed the elastic limit of the metal, and that doesn't happen during normal cycling. Aluminum has a finite fatigue life and will eventually fail even when flexed below the fatigue limit. CF will fail due to fiber pull-out, epoxy (matrix) cracking, and fiber failure. That said, however, there is no way to factor in things like design, usage, construction quality, and crashes. A super thin steel frame can easily be less durable than a solid Al one. Designs that include stress risers at joints or elsewhere will contribute to shorter frame life. Some riders "ride heavy" while others "ride light" and obviously some riders are heavier than others! Hitting or avoiding every pothole, pavement crack, rock, railroad track, or other road obstacle can have a significant impact (no pun intended) on frame life. Spinning smoothly or mashing will accumulate over the millions of pedal strokes. Sitting like lead on the saddle when hitting bumps vs. rising up just a bit and letting your arms/legs take the shock has the same cumulative effect. Even the best designed and generally well-built frames can still fail due to weld quality problems that went unseen. Frame gouges can provide stress risers that lead to failure. Crashes can really damage a frame, or can have no effect, and it is just about impossible to tell one kind of crash from another unless there is immediate damage. And you want to know how long YOUR frame will last without telling us any information at all.
Frame Infostinkfoot247
May 4, 2003 5:28 PM
the frame is a raliegh R700 Aluminum Scandium frame. I am a extremely cautious rider, avoiding potholes and everything. I am more of a spinner. Frame fatigue I don't think I need to worry about, And I'm going to put another post up to get others opinions on it. From what I have read they compensate a definite fatigue life with larger diameter tubing which is why aluminum frames are so stiff. What are stress risers. oh, btw I have never crashed.
Allright kerry!the bull
May 4, 2003 5:43 PM
Lets do it now tell him how long this frame is gonna last!
Raleigh made scandium?Fez
May 4, 2003 5:55 PM
Are you sure it was scandium? A Raleigh R700 frames sounds like it was aluminum, as far as I can remember for the past few years.
Aluminum scandium alloy nm.stinkfoot247
May 5, 2003 8:42 AM