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).
Vehicle test parameters including rear axle ratio, tyre size, and fuel type.
| Identifier | ExFiles\Box 170\1\ img081 | |
| Date | 2nd October 1940 guessed | |
| ⑤ Rear axle ratio 3.73 : 1. ⑥ Tyres 6.50 x 16. All tests run on POOL SPIRIT. RM{William Robotham - Chief Engineer}/WYM.{G. Harold Whyman - Experimental Manager} [Illegible handwritten text] | ||