OK, I'm going to jump in here and provide the opinion that just because a bike says it is Chromoly doesn't mean it is 4130. There are different qualities of chromoly steel, and I've always assumed that the ones that don't say 4130 are because it isn't as good. I've had several old bikes that were chromoly, but you wouldn't know it from the weight because it as cheaper stuff. Maybe I'm wrong, but I don't think that you can assume that all bikes that say chromoly are equal.