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).
The wear and tear of experimental silent type tyres after 4,700 miles of testing.
| Identifier | ExFiles\Box 45\2\ Scan306 | |
| Date | 4th October 1930 | |
| S/W Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer} (82) 6 6/10 X4050. C10/C4.10.30. X4050 X7820. X5820. NEW TYPE TYRES. ------- On the question of wear and tear with the experimental silent type tyre which has been running on our Trials car, this has now covered a distance of 4,700 miles. The treads have now been carefully examined by our drivers and they are of the opinion that the rear tyres, which show a certain amount of wear and tear, have worn definitely less than they would have expected standard Silent tyres to have worn under the same conditions of service. They do not expect the standard Silent tread to be effective for longer than 7,000 miles use. C. | ||