Nearly any bike can be equipped with racks. However, if shorter wheelbase (road racer, folder, etc.), heel clearance for rear panniers is critical. For my Dahon 20" wheel folder, I had to search for a rack that holds the panniers aft of the rear axle centerline, and that was 2015. Now, rear racks seem to have fallen out of favor, so selection is even less, my rack is no longer made. Notably, some rear rack designs come with separate lower sections, allowing the rack to be centered over the rear axle, or lowers that curve forward, putting the rack further aft. Mine is so far back and the rear rack stay braze-ons so low, that I needed extra-super-long rack stays, only a couple companies make them to sell separate. But there are no stability issues at all, with the panniers behind the rear axle, even heavily loaded.