My son's old Eureka. Building a little park bike.
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I live in East coast and between the summer humidity and wet trails, steel over time will corrode unless it has a lot of alloy in it. I'm not questioning the durability and longevity of steel, my only concern is if you ride in very rocky conditions in a humid environment, when the steel looses its protective paint coating it could be an issue over time.4130 Is somewhat corrosion resistant, but its not stainless. Its not a problem at all in Idaho's dry climate. The durability and ride quality of steel far outweigh any concerns I have about corrosion.