From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Comparing the tyre sizes on the Phantom III to those on Humber models.
| Identifier | ExFiles\Box 158\1\ scan0112 | |
| Date | 15th June 1937 | |
| S/W.......Rm.{William Robotham - Chief Engineer} 1339 C10/D15.6.37. Re: Tyres on Phantom III. We were informed that the tyres on Phantom III 1S-10- are smaller in section than those fitted to the Humber, 1S-35 FORT and on making enquiries we find that this is so. On the Phantom III we find they are 7.00" x 18" and on the Humber 7.50" x 16", i.e. on the "Snipe" and their Pullman models. (14/35 45 FORT) This seems rather extraordinary and it would seem either that they are over-tyred or we are under-tyred. I shall be interested to know what your views are. C. [Signature] | ||