Nearly every variety of "wheel" ever invented on one website: unusuallocomotion.com

above from my post about the Pedrail Diplock http://justacarguy.blogspot.com/2011/08/pedrail-system-by-diplock-in-1904-pages.html

I've posted a couple in the past that these guys haven't posted... but I don't have time to search 6 years of archives to find them. They are probably in http://justacarguy.blogspot.com/search/label/rims if you want to look around

Above images from http://www.unusuallocomotion.com/pages/locomotion/the-wheel-reinvented.html

but you seriously are missing hundreds more if you don't look at the links on the left hand side of their site: http://www.unusuallocomotion.com/pages/locomotion/pneumatic-tracks.html
http://www.unusuallocomotion.com/pages/industrial/rolligons-and-terra-tires.html
etc etc