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Similar to 7800 series rear wheels in a scale 42" diameter.
Fit our 1/64 20.8-42 R1 tractor tires
Link to Tires:
https://www.shapeways.com/product/HRUPEW68K/1-64-20-8-42-r1-tractor-tires?key=9b71ff991294678918e978c38e532469