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).
Tyre pressures for the Phantom, comparing the instruction book figures with test results on a car with balanced wheels.
| Identifier | ExFiles\Box 71\3\ scan0321 | |
| Date | 11th September 1925 | |
| X8950 To BJ. from Hs.{Lord Ernest Hives - Chair} Hs{Lord Ernest Hives - Chair}5/LG11.9.25. TYRE PRESSURES. (103-MC) X 8950 x.3538 With reference to BJ9/DN10.9.25 attached. The Phantom Instruction Book gives the minimum tyre pressure for front tyres as 55 lbs. The car which we left with R.{Sir Henry Royce} (46-PK) is running with a tyre pressure on the front of 40 lbs, the wheels being correctly balanced. The results of our tests show that if tyres are correctly balanced, low pressures can be used. If the tyres are not balanced, then a higher pressure must be used. Hs.{Lord Ernest Hives - Chair} | ||