[NathanielK]

Frame rust isn't a big deal on bicycle. Even in the 80's high-alloy steel like 4130 "Chromo" has been popular with bicycles. I've abused my 70's mtb bicycle with thousands of km of rustbelt winter riding and my frame shows no worrying corrosion, just surface discoloration where the paint has been scratched.

Carbon fiber is more durable than people give it credit for too, though because it's a brittle material that fails suddenly, larger safety factors should be used.