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).
Tyre wear, a 10,000-mile test on chassis 69H, and a proposal for a 20,000-mile test on chassis 59H to test improved components.
| Identifier | WestWitteringFiles\I\May1922\ Scan130 | |
| Date | 30th May 1922 guessed | |
| 4 24 worn away. This may be the reason for many French drivers still using steel studded leather treaded tyres. It is just possible that they get better results on dry gritty roads with the leather & steel tread. You will notice by the mileage of 69H that we shall soon complete the 10000. Will you please let me know what we should then do. It might be desirable to bring the car back to the works for examination and dismantling as probably this second car may give us more information which would be valuable at the beginning of manufacture, particularly as this car has been regularly lubricated. If it is desirable to do 20,000 miles on a particular chassis 59H could be brought back for this test and could be run in different country amongst the hills. It would have the advantage that it would have on many improved parts which it would be useful to test, and would avoid running parts which admittedly need alteration such as, brake drums & dampers, brake compensating shafts, differential bevel pinion, axle shafts, dynamo commutator, spring shackles. | ||