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Hmm your right the end of the steering piece that is fixed to the vehicle should go in and out but not up and down with the wheel so i could attach a ridgid linkage from there around the tire to the skirt. That would require me to disconnect a second pin on the side as well as the top one for removal but it seems simpler overall.
The rollers would be sealed like the hub, though the rotational speed would be higher. It would be a good idea to not have another part always rotating at high speed though so i don't think its a good idea. Also as the wishbone suspension arcs inward there would be slack and too much play in the pivoting with only one of the two roller touching the sidewall at a time unless the roller were pressed against the sidewall with short springs. I also wonder if the dirty sidewall would get worn out by the smooth steel or ceramic roller before the tread wears out.
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