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 analysis from races in 1935 and 1936.
| Identifier | ExFiles\Box 90a\6\ Scan112 | |
| Date | 21th September 1936 | |
| -2- The reduction in circumference was 0.25" on the front tyres, and 0.45" on the rear tyres. In 1935 the wear on the rear tyres for the first half of the race was 0.0126" per lap and in the second half of the race the wear was 0.0115" per lap. The front tyres used in the first half of the race in 1935 were the only front tyres measured and they showed 0.0121" per lap on the nearside and 0.0082" per lap on the offside. In both 1935 and in 1936 the wear of the tyres in the race was much less than the wear of the tyres used in practice. This can probably be attributed to two things, first, a constant reducing weight of the car, and second, a continual smoothing of the road as the race proceeds. The difference in wear between the nearside and offside tyres was very marked this year, much more so than in 1935. It is logical that, with the cars running in a clockwise direction the most of the wear would be on the nearside tyre that is, the tyre on the outside of the turning circle. This was so in 1935 when the race was run under hot and dry conditions. In 1936 the conditions of weather were completely reversed, 15 laps being run in very wet weather and 15 laps in dry weather. It was very cold throughout the race. In this case the offside tyres wore down very much faster than the nearside tyres. As a result of the experience gained in 1935 and 1936, we feel confident that, in future races, India Tyres will complete the course without a change, unless some very radical change is made in the car. | ||