Steaming carried a reprint of a Commercial Motor report contemporary with the Argentine order. That would be about 30 years ago and I don't have it by me just now. It certainly gave tyre sizes along with engine BHP & torque curves and a report of the Horseshoe test run etc. Worth looking out. If I can find it I will scan & upload. Anyway, if memory serves they were 40 x 8.
Martin
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