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).
The performance of special variable pitch tyres after initial mileage on 25/30 and Phantom III models.
| Identifier | ExFiles\Box 158\1\ scan0160 | |
| Date | 27th November 1937 | |
| S/W. Rm.{William Robotham - Chief Engineer} GBryx 1339 Tyres Cx{Major Len W. Cox - Advertising Manager}1/KW27.11.37. In reply to Rm{William Robotham - Chief Engineer}/Gry{Shadwell Grylls}6/AP22.11.37, and with reference to the two special sets of tyres for 25/30 and P.III respectively which we recently fitted of the variable pitch type, these so far have only done 2000 miles on the P.III and 1000 miles on the 25/30. There is no apparent difference yet in the degree of silence which was noticeable when they were first fitted. Cx.{Major Len W. Cox - Advertising Manager} Suel | ||