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 recommended tyre pressures for Phantom II and 20 HP models.
| Identifier | ExFiles\Box 58\1\ Scan100 | |
| Date | 20th May 1930 | |
| COPY. JLE.{J. Lee Evans - Chassis Test Manager} Lillie Hall. c. Rm.{William Robotham - Chief Engineer} X5820. EP{G. Eric Platford - Chief Quality Engineer}/Thn3/H20.5.30. X.7820. X.5820. re. Tyre Pressures. With reference to your memo. LE6/R13.5.30. The tyre pressures we recommend for Phantom 11 and 20 HP. both for high speed work and low speed and town work are as under :- Phantom 11. High Speed Work - 45-50 lbs. Front. 45 lbs. Rear. Low Speed and Town Work. - 40 lbs. Front. - 35 lbs. Rear. 20 HP. High Speed Work. - 40 lbs. Front. 35 lbs. Rear. Low Speed and Town Work. 35 lbs. Front. 30 lbs. Rear. We shall be glad if Rm.{William Robotham - Chief Engineer} will please note the above and let us know whether he has any modifications or comments. EP{G. Eric Platford - Chief Quality Engineer}/Thn. | ||