As long as it's protected from the weather, and if it hasn't cracked somewhere yet, it will last forever.
Steel, specifically, has a fatigue endurance limit. A stress value below which it will never develop damage that could produce a crack.
Originally Posted by
CliffordK
Is anybody building "High Tensile" steel bikes now? Perhaps a few kid's bikes.
Quite a few nice bikes, Shinola, for one, Public for another.
This one logged about 40,000 mi (unfortunately the frame was bent in a crash this year, and I upgraded it)
