Here is what the Allis supllied as standard equipment: unstyled WC 11.25x24
My Goodyear chart dated from 1962 converts that size to the modern size of 14.9x24 sqeezed onto a pretty narrow rim to give it a high profile. It's the same tire as the 11.25x24 measured at a different place. My brother has a 1934 WC with 14.9x24 tires and it does look right to me IMHO. The later styled WC ran either a 12.4x28 or 11.2x28 which are modern measurements of much narrower tires than the unstyled WC but taller.