'Spectre' tyre sizes and their sensitivity to pressure.
| Identifier | ExFiles\Box 157\1\ scan0181 | |
| Date | 25th February 1935 | |
| 44050 To E. {Mr Elliott - Chief Engineer} c. to By; c. to RHC {R. H. Coverley - Production Engineer} c. to Wor. {Arthur Wormald - General Works Manager} Hs {Lord Ernest Hives - Chair} /Les.4/KW.25.2.35. Spectre(Codename for Phantom III) Tyre Sizes. We have found that the 7.5" tyre is very sensitive to pressure. That is, if the tyre is allowed to get as low as 30 lbs/sq.in. pressure from a standard 35 lbs/sq.in. pressure, the controllability of the car is far inferior. It is necessary therefore that Spectre(Codename for Phantom III) should begin with a 7" section tyre similar to Ph.II. The ground clearance with the 7" section tyres is 1/10" less than with the 7.5 section tyre. Hs {Lord Ernest Hives - Chair} /I.A.Leslie. | ||
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).