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).
Front tyre wear and toe-in settings on the Wraith model.
| Identifier | ExFiles\Box 158\2\ scan0055 | |
| Date | 21th August 1939 | |
| 1339. Da{Bernard Day - Chassis Design}/DB{Donald Bastow - Suspensions} from Mx{John H Maddocks - Chief Proving Officer}/SB{Mr Bull/Mr Bannister} a.{Mr Adams} HY{Tom Haldenby - Plant Engineer} c. Rm{William Robotham - Chief Engineer} o.{Mr Oldham} Da{Bernard Day - Chassis Design} e.{Mr Elliott - Chief Engineer} Hr Mx{John H Maddocks - Chief Proving Officer}/SB.{Mr Bull/Mr Bannister}1/MG.21.8.39 FRONT TYRE WEAR ON WRAITH Further to Mx{John H Maddocks - Chief Proving Officer}/SB{Mr Bull/Mr Bannister}15/G.17.8.39, it is worth noting that the toe-in on 27.G.VI was carefully measured some time ago and found to be .156". The front tyres have always worn very evenly. In Mx{John H Maddocks - Chief Proving Officer}4/N20.4.39 it was reported that the last set of front tyres had done 9,594 miles. This mileage was done on rather better roads and at not such a high average speed as during the earlier history of the car, when the front tyre mileage was between 5,000 and 6,000 miles. Although .156" toe-in is about as high as we would like to go, it does show that, provided the toe-in is not excessive, front tyre mileage can be anything between 5,000 and 10,000 depending on how and where the car is driven. Mx{John H Maddocks - Chief Proving Officer}/SB{Mr Bull/Mr Bannister} | ||