I've got a couple of bikes, a trek and a univega, that simply say "chromoly" on them but no #. As I understand it 4130, ferinstance, is a designation based upon the components in the steel from the AISI like while something like 531 is a trademark.
Checking out steel grades online it looks like the AISI just lists chromoly as 41xx. So, the question is, if a bike is labled as chromoly but doesn't have any trademark or # designation, is it basically 4130? 4130 seems to be the baseline for a steel to be called chromolly. Is this correct?