I've heard people talk about how much lighter chrome moly is and the benefits of using chrome moly, but I've also heard people say, for example: "A chrome moly cage will only last about 4+- years before it starts getting brittle, where a mild steel cage may last 25 years". I've also heard that the "brittleness" comes from the weld area not the chrome moly itself.

What exactly does this mean? Surely everyone doesn't replace every chrome moly part, cage, k-member etc every 4+- years......

Discuss