On my most recent robot i have 4 13" wheels driven by wheel chair motors. Someone asked me to make a vid on how i did it so here it is:)
showing how i converted some $13 harbor freight wheels to work with 17mm keyslot motor shafts. For some reason with goofy video format doesnt have sound so srry. I found the 17mm wheel chair hubs on the net for $25 each. In total it costs about $37 for each wheel which is killer considering i was going to pay a machine shop close to $300 to custom make four adapters for the tires. anyways, i hope this helps anyone who want to do something simular.