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).
Note about the reduction in tyre section for the 20 HP model.
| Identifier | ExFiles\Box 67\3\ scan0057 | |
| Date | 13th November 1924 guessed | |
| contd :- -2- wheels and tyres for the 20 HP. in which the section of the tyre has been slightly reduced from those which have been on Mr. Royce's 20 HP. car. Hs.{Lord Ernest Hives - Chair} | ||