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).
Recommended tyre pressures for Phantom II and 20-HP models.
| Identifier | ExFiles\Box 65\2\ scan0317 | |
| Date | 20th May 1930 | |
| JLE.{J. Lee Evans - Chassis Test Manager} Lillie Hall. x7820 c. Rm.{William Robotham - Chief Engineer} EP{G. Eric Platford - Chief Quality Engineer}/Thn3/H20.5.30. x7820 x5820 re. Tyre Pressures. With reference to your memo. LE6/R13.5.30. The tyre pressures we recommend for Phantom II. and 20-HP both for high speed work and low speed and town work are as under:- Phantom II. High Speed work- 45- 50 Lbs. Front. 40 45 lbs. Rear. 3 35 Low speed and - 40 Lbs. Front. 40 Town work. 35 Lbs. Rear. 30 20-HP. High Speed work -40 Lbs. Front. 35 lbs. Rear. Low Speed and 35 Lbs. Front. Town work. 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. | ||