Ok so I started late last year on my bike. My plan is to build a low geared pulling machine. I got side track with fishing so here I am, almost done with my reduction (lacking a couple pieces of aluminum). My problem is I don't want to make my order of metal until I know what material I am going to use for the rack. I was thinking about using aluminum for the rack but I am not sure how thick I should go on the legs. Steel is an option but the question still remains how thick should the legs be.