Apparently, 1100-20 replaced 1050-20 during the war, and lasted for a long time afterwards, so that's probably what you want for the gun tractor.
Note this is a different size from 1100R20 (which caught me out, R tyres are on a reduced profile, so have a smaller overall diameter). It could be interesting to see if theres a modern R size that intersects with the old 1100-20 size, maybe around 1400R20.
1100x20 could be either, but seems more likely as 1100-20.
Last edited by Lauren Child; 22-01-17 at 19:02.
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