From my walking in the store and having to pick up bikes just to know how mine compare in weight to them, I'd venture a guess that even Schwinns from Wal-Mart differ vastly from Schwinns from somewhere like Dicks Sporting Goods, let alone Schwinns from the LBS (not that I have seen any Schwinns beyond cruisers in a LBS in a while).
Other than that, price point should give you an idea. A dozen or two bucks would indicate the same level of quality, a few hundred not. As far as CL, I can't say I browse that section of bikes often, but I'd think you'd want to look at the components to determine level of quality.
Last edited by jefnvk; 04-21-16 at 11:00 PM.