I keep reading that aluminium has no fatigue limit and that bicycle frames made from it will fail within quite short periods of time. Is this true or just a myth. I don´t seem to remember reading any posts where someone with a decent aluminium frame has actually reported a real-life case of frame failure due to metal fatigue.

Can anyone out there report real life cases of aluminium frame failures caused by metal fatigue. I don´t mean resulting from crash damage or botched welds. If so what were the circumstances - age of the bike etc.

I have a couple of aluminium frame bikes and it would be nice to have some evidence that frame replacement is necessary before I junk the frames in a couple of years.