been sat here thinking of how to make some flexi wheels. here is my plan.

get some nice 15mm polypropolene and cut out 2 circles of whatever dia you wish. lets say 400mm. then drill a hole for the shaft. mabee 30mm holow shaft fot a bit of strength. make a carrier to hold the 2 pieces of poly to the shaft a bit like a kart setup. space out the 2 pieces of poly to about 80mm. between the poly put in springs so the 2 pieces will have flex but then add a bit of strength. then get a nice thick piece of tyre and screw it to the 2 pieces of poly around the outside. when the wheel flexes the tyre should flex with it.

is that a bit too much work for some flexi wheels???????