22" were a common commercial size at one time - for example several U.S. wartime trucks and the odd semitrailer used 10.00 x 20. Not come across 9.00 though, as these are branded Dunlop they would be for UK use - probably a commercial vehicle.
In fact, here you go, tight under our noses!! http://hmvf.co.uk/forumvb/showthread.php?50721-900-x-22-tyres