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).
Comparing the weights of detachable wheels from different manufacturers.
| Identifier | ExFiles\Box 3\3\ 03-page099 | |
| Date | 3rd July 1913 guessed | |
| Detachable wheels 3700 1200 Shrewsbury & Challiner. wheel without hub body - forged nuts. Front. 58 lbs. - R.R. 38 lbs. Rear. 73 - R.R. 57 lbs Rudge Whitworth steel^2 hub flanges. F - 402 Rear - 55. | ||