Average tyre mileage for the Wraith and 25/30 models.
| Identifier | ExFiles\Box 157\2\ scan0293 | |
| Date | 5th August 1938 | |
| 1332 COPY FOR TYRE FILE. To Rm. {William Robotham - Chief Engineer} from Rm {William Robotham - Chief Engineer} /Wym. {G. Harold Whyman - Experimental Manager} 5.8.38. AVERAGE TYRE MILEAGE. WRAITH. 25/30. FRONT. REAR. FRONT. REAR 4994.83 4117.44 13,075.25 7667.2 Average mileage of 14 Dunlop tyres which have had normal useage. In each case tyres have worn smooth only. A further 2000 - 3000 miles could be run before showing any canvas. Rm {William Robotham - Chief Engineer} /Wym. {G. Harold Whyman - Experimental Manager} | ||
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).