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).
Daily mileage and tyre performance log for a car.
| Identifier | ExFiles\Box 45\1\ Scan197 | |
| Date | 19th April 1921 | |
| -2- Date. | Tyres fitted. | Position on car. | Total miles. F.{Mr Friese} R.{Sir Henry Royce} | Daily miles. | Route taken. | Remarks. 19.4.21 | WGD.4088 WGD.4261 WGD.4998 WGD.4257 | O front N front O rear N rear | 2261 2261 | 120 | Derbyshire. | Average speed 25 M.P.H. Moderate roads. 20.4.21 | WGD.4088 WGD.4261 WGD.4998 WGD.4257 | O front N front O rear N rear | 2452 2452 | 191 | " | ditto 21.4.21 | WGD.4088 WGD.4261 WGD.4998 WGD.4257 | O front N front O rear N rear | 2493 2493 | 41 | Local | 22.4.21 | WGD.4088 WGD.4261 WGD.4998 WGD.4257 | O front N front O rear N rear | 2527 2527 | 34 | " | 25.4.21 | WGD.4088 WGD.4261 WGD.4998 WGD.4257 | O front N front O rear N rear | 2532 2532 | 5 | " | 26.4.21 | WGD.4088 WGD.4261 WGD.4998 WGD.4257 | O front N front O rear N rear | 2564 2564 | 32 | " | 27.4.21 | WGD.4088 WGD.4261 WGD.4998 WGD.4257 | O front N front O rear N rear | 2583 2583 | 18 | " | 28.4.21 | WGD.4088 WGD.4261 WGD.4998 WGD.4257 | O front N front O rear N rear | 2600 2600 | 18 | " | contd:- | ||