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).
Query from BJ regarding the effect of new 33 in. x 6 in. tyres on the gear ratio and performance of a 20 HP car.
| Identifier | ExFiles\Box 58\1\ Scan028 | |
| Date | 17th June 1927 | |
| [Handwritten top right] X5820 | X4565 To Hs.{Lord Ernest Hives - Chair} from BJ. Standardisation Sheet BJ7/E17/6/27 5820 33 in. x 6 in.Tyres. 20 HP. [Handwritten and crossed out below 5820] 4565 -------------------------------------------------- At present I am not quite clear as to what difference these tyres will make [strikethrough]the[/strikethrough] to the gear ratio of a car. At present the gear ratio is [strikethrough]allright[/strikethrough] already rather too high on closed cars. The majority of our cars are closed. Will you kindly explain the matter to me as clearly as possible, as anything which will make the 20 HP more sluggish in pick-up and on hills is a very great detriment. BJ. | ||