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).
Discontinuation of high-pressure tires and the adoption of low-pressure tires as standard equipment.
| Identifier | ExFiles\Box 72\2\ scan0050 | |
| Date | 15th September 1925 | |
| Oy1-E-91525 -2- September 15, 1925. (4) In consequence of almost no demand, tire manufacturers here contemplate discontinuing the high pressure tires so that such tires will not be readily available after another year or so. (5) In the last two years the demand for the low-pressure 33x6.75 - 6 ply tires has forced us to supply them as optional equipment. We have not found any disadvantage in their use, so long as a pressure of approximately forty pounds is maintained in the front tires to keep the steering free and steady. On the contrary insistent sales demand for improved comfort and tire mileage makes it desirable to supply them on all cars. We propose to continue the double battery ignition as approved by Mr. Royce for our present series of cars. We propose to continue the present pressure system as it is apparent from our Maintenance records that it is quite satisfactory to our owners, and we have not yet had an opportunity of observing the performance of the vacuum feed on our cars, for long periods or at high altitudes. Yours very truly, Maurice Olley Read and approved. Thos. Madin. 9/15/25 MO/E | ||