Assuming I have 3 folding bikes with 20" wheels of the same frame design, same accessories and components but one has a frame made of aluminum, one a frame made of chromoly and one a frame made of "common steel". What is going to be the weight of each one of these? The reason why I ask is to try to decide if the extra cost for the lighter frame is going to be worth it, i.e. if the aluminum frame is only 3 pounds lighter than a chromoly frame and is $200 more I may not feel the extra $$ is justifiable.
PS I know that aluminum bikes and steel bikes have different frame designs because of the characteristics of the metals - the question is phrased hypothetically to get an understanding of the relative weights.