I ordered the wrong size because they had the right info about sizing these center stands on the tall stands page not on the shorter one. So with the return shipping it cost me $45.
You must measure the distance from the mounting place to the bottom of the return chain line. I should have known that.

Most long cage derailleurs will need the taller one. http://www.crowcycleco.com/bicycle-c...xtra-tall.html

These are made mostly of heavy gauge steel but with solid aluminum legs, I could not find a stainless steel bolt to replace them with (12mm 1.5p). I did replace the attachment bolt with stainless steel (10mm 1.5p 50mm long). I will post some photos soon.

If 3lbs is too much for you are not riding a heavy duty cargo bike. But they do have lighter center stands.http://www.crowcycleco.com/bicycle-c...t-black-1.html

If you don’t want them to fill up with road mud you need a fender extension.

I think if your going to load children at a high center of gravity, you may need wider stand. Tall nerrow stands are very tippy on tilted ground.