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).
Analysis comparing the lifespan of Wraith tyres against 25/30 tyres, including data from tests in France.
| Identifier | ExFiles\Box 157\2\ scan0289 | |
| Date | 2nd August 1938 | |
| 1332 To Rm{William Robotham - Chief Engineer}/Wym.{G. Harold Whyman - Experimental Manager} from Rm.{William Robotham - Chief Engineer} c. Rm{William Robotham - Chief Engineer}/TMW. Handwritten notes: included, See below, Aus. (signature) Rm.{William Robotham - Chief Engineer}3/MH.{M. Huckerby}2.8.38. WRAITH TYRES. Will you please let me have an analysis from experimental records showing how the life of Wraith tyres compares with the life of 25/30. This should include the running in France. Handwritten notes: Tests in France mean of all records available. of life of tyres. Rm.{William Robotham - Chief Engineer} Table Data (Handwritten): | | 25/30 | WRAITH | |---|---|---| | Model | 22 G V | 26 G VI | | FRONT | 7510 | 5570 | | REAR | 4169 | 4980 | | ||