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 log of vehicle testing, detailing tyre configurations, mileage, routes, and performance remarks.
| Identifier | ExFiles\Box 45\1\ Scan222 | |
| Date | 20th May 1921 | |
| Date. Tyres fitted. Position on car. Total miles. F.{Mr Friese} R Daily miles. Route. Remarks. 10.5.21 WGD.4088 WGD.4261 WGD.4998 WGD.4257 O front N front O rear N rear 3201 3201 3201 3201 18 Local. 11.5.21 WGD.4088 WGD.4261 WGD.4998 WGD.4257 O front N front O rear N rear 3219 3219 3219 3219 18 Local. 12.5.21 WGD.4088 WGD.4261 WGD.4998 WGD.4257 O front N front O rear N rear 3320 3320 3320 3320 101 Birmingham and back. Average speed 25 M.P.H. Good roads. 13.5.21 17.5.21 WGD.4088 WGD.4261 WGD.4998 WGD.4257 O front N front O rear N rear 3755 3755 3755 3755 435 Blackpool and Derbyshire. 18.5.21 WGD.4088 WGD.4261 WGD.4998 WGD.4257 O front N front O rear N rear 3781 3781 3781 3781 26 Local test runs. 19.5.21 WGD.4088 WGD.4261 WGD.4998 WGD.4257 O front N front O rear N rear 3803 3803 3803 3803 22 " " 20.5.21 WGD.4088 WGD.4261 WGD.4998 WGD.4257 O front N front O rear N rear 3812 3812 3812 3812 9 " " contd:- | ||