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).
Factors affecting tyre wear, including temperature, road conditions, and tyre construction.
| Identifier | ExFiles\Box 158\1\ scan0013 | |
| Date | 14th January 1927 guessed | |
| contd :- -5- Knowing all we do about this phenomenon in the way of correct pivot lean and friction in the steering, no trouble should arise with the balloon type of tyre. The simplest retrospective cure is to fit a spring loaded cross steering tube. II: FACTORS AFFECTING TYRE WEAR. (a) High temperature effects. No adequate comparison can be made between any two types of tyres for wear unless it is known that the tyres have been run under approximately the same atmospheric conditions. To emphasize this point it may be said that in some of our tests the tyre mileage has been increased 50% or more owing to a cool spell occurring in very hot weather. Again, water has a very beneficial effect on the life of a tyre. (b) Relative tyre life under British and Continental conditions. We have frequently carried out a 10,000 miles test in England without having a puncture. Usually the non-skid portion of the tread on the rear tyres is still visible at the end of the test. In France the average life of the rear tyres is rather less than 2500 miles, the front about 4000 miles. In hot weather driving fast on non-tarred roads, the life of the rear tyres has shewn an average of less than 1500 miles. Naturally, the state of the surface and the number of bends negotiated has a direct bearing on this point. (c) Double tread tyres. Double tread tyres have been widely advertised. Our experience is that the extra thickness of the second contd :- | ||