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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 performance of Rapson S-S Cord Tyres with deflection tubes, tracking mileage and dates.

Identifier  ExFiles\Box 39\1\  Scan051
Date  9th December 1923
  
REPORT ON .2 X 4½ RAPSON S-S CORD TYRE. WITH DEFLECTION TUBES.

DATE. | TYRE NO'S. | WHERE FITTED. | SPEEDO-METER READING. | DAYS RUN. | TOTAL MILES. | REMARKS.
29.11.23 | YX. 63146, YX. 63253, YX. 63141, YX. 63124 | Off rear, Near rear, Off front, near front. | 1707, 1852 | 145 | 145 | Pressure - Front - 40 lbs. Rear - 45 lbs.
30.11.23 | " | " | 2044 | 192 | 337 |
1.12.23, 2.12.23 | " | " | 2373 | 329 | 666 |
3.12.23 | " | " | 2509 | 136 | 802 |
4.12.23 | " | " | 2706 | 197 | 999 |
5.12.23 | " | " | 2905 | 199 | 1198 |
6.12.23 | " | " | 3105 | 200 | 1398 |
7.12.23 | " | " | 3299 | 194 | 1492 |
8.12.23, 9.12.23 | " / " | " | 3441 | 142 | 1734 |

Average speed - 30 M.P.H.
  
  


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