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).
Table outlining the range of available springs and their deflection specifications for 40/50 & 25 HP cars.
| Identifier | ExFiles\Box 106\1\ scan0263 | |
| Date | 16th June 1931 guessed | |
| RANGE OF SPRINGS AVAILABLE. 40/50 & 25 H.P. CARS. | | 40/50 Deflections Ins. | 25 H.P. Deflections Ins. | |---|---|---|---|---| | | Front | Rear | Front | Rear | | Max. riding comfort to 70 M.P.H. Soft. | 4.5" | 10.25" | 4." | 6.4" | | Intermediate 1930 standard | 3.1" | 8.25" | 2.25" | 5.125" | | Sports. High Speed Car Control | 2.2" | 6.1" | + 1.700 | + 3.84 | Each standard of springing has its own recommended schedule of shock absorber loading. + This has not been run experimentally as yet. If there is any demand for a continental type 25 H.P. they can be tested out. We do not anticipate trouble. | ||