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Just a thought but wheels that size (20 foot diameter) would be extremely heavy if they were a simple drum. I would think that Holt would have designed a dished design to give maximum resistance to buckling at lowest weight. Something like traction engine wheels might give the best trade off between strength and weight. Also would provide a decent challenge for most modellers.
The wheel diameter on the Foster-Daimler tractor (attached) was about 8 feet.
Charlie
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