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by pbsurf
1580 days ago
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Regarding aluminum vs. steel - I've had two aluminum frames crack after a couple years of normal riding (no crashes). Trek, to their credit, honored their warranty and replaced the bikes. Given enough time, aluminum will always fail; steel will not: https://en.wikipedia.org/wiki/Fatigue_limit |
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Yes, steel has a fatigue limit, but it’s unlikely to come into play because of the requirements to be in that regime (mainly, bikes are too light) while at the same time, fatigue is highly sensitive to the details of the shape of the connection and any initial imperfections from welds.
Personally, I’ve had an aluminum bike and a steel bike fail in fatigue, both starting in welds.