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).
Log sheet tracking tyre mileage, position, and performance over various dates and routes.
| Identifier | ExFiles\Box 45\1\ Scan173 | |
| Date | 19th January 1921 guessed | |
| -3- Date. | Tyres fitted. | Position on Car. | Total mileage. F.{Mr Friese} R.{Sir Henry Royce} | Daily miles. | Route taken. | Remarks. 3.1.21 | FD.{Frank Dodd - Bodies}D.5256 | N front | 296 | 14 | Local | | FD.{Frank Dodd - Bodies}D.5257 | O front | 296 | | | | FD.{Frank Dodd - Bodies}D.5206 | N rear | 678 | | | | FD.{Frank Dodd - Bodies}D.5234 | O rear | 678 | | | 4.1.21 | FD.{Frank Dodd - Bodies}D.5256 | N front | 311 | 15 | Local | See report Hs{Lord Ernest Hives - Chair}/TMW5/LG4.1.21. | FD.{Frank Dodd - Bodies}D.5257 | O front | 311 | | | | FD.{Frank Dodd - Bodies}D.5206 | N rear | 693 | | | | FD.{Frank Dodd - Bodies}D.5234 | O rear | 693 | | | 5.1.21 | | | | | | Tyres changed round. 8.1.21 | FD.{Frank Dodd - Bodies}D.5257 | N.front | 492 | 181 | Derbyshire. | Average speed 20 M.P.H. Fairly good roads. 9.1.21 | FD.{Frank Dodd - Bodies}D.5256 | O front | 492 | | | | FD.{Frank Dodd - Bodies}D.5234 | N rear | 874 | | | | FD.{Frank Dodd - Bodies}D.5206 | O rear | 874 | | | 10.1.21| FD.{Frank Dodd - Bodies}D.5257 | N front | 617 | 125 | Derbyshire. | Tyres chaged round. | FD.{Frank Dodd - Bodies}D.5256 | O front | 617 | | | | FD.{Frank Dodd - Bodies}D.5234 | N rear | 999 | | | | FD.{Frank Dodd - Bodies}D.5206 | O rear | 999 | | | | ||