Does anyone know where just the wheel/hub from a Cat Trax can be sourced from?
The balloon tires are cheap, Nanco N800's which can be had readily for under $50/tire.
The rest of the parts are trivial -- 2" aluminum tube 96" long, some Delrin rod cut to length for bearings, washers and cotter pins and such.
I have searched high and low and cannot find the wheels used on a proper Cat Trax. It could be that they are proprietary.
Could use a 8" x 9" steel or aluminum wheel which are cheap and available, but then you've got to deal with a 4 bolt 4" hub and it goes downhill from there, too complex and heavy for the beach.
The wheel hub is the key to success in fabricating these cheaply at home.