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).
Log tracking the performance and mileage of 32 x 4½ Rapson S. Cord tyres with deflector tubes.
| Identifier | ExFiles\Box 39\1\ Scan087 | |
| Date | 29th April 1924 | |
| 32 X 4½ RAPSON S. CORD TYRES WITH DEFLECTOR TUBES. 29.4.24. DATE. | TYRE NOS. | WHERE FITTED. | SPEEDO-METER READING. | DAYS RUN. | TOTAL MILEAGE. | REMARKS+ | | | | | Front. | rear. | 6.4.24 | 63146 | O.S. rear | 3,530 | 121 | 11,833 | 10,909 | Air pressure - front 35 lbs.sq.in. rear 40 " " " | 63252 | N.S. rear | | 63141 | O.S. Front| | 63124 | N.S. Front| 7.4.24 | " | " | 3,592 | 62 | 11,895 | 10,971 | 8.4.24 | " | " | 3,606 | 14 | 11,909 | 10,985 | 9.4.24 | " | " | 3,664 | 58 | 11,967 | 11,043 | 11.4.24 | " | " | 3,788 | 124 | 12,091 | 11,167 | 12.4.24 13.4.24 | " | " | 3,844 | 56 | 12,147 | 11,223 | 14.4.24 15.4.24 | " | " | 4,262 | 418 | 12,565 | 11,641 | 16.4.24 | " | " | 4,291 | 29 | 12,594 | 11,670 | 17.4.24 up to & including 22.4.24 | " | " | 4,580 | 289 | 12,883 | 11,969 | 26.4.24 27.4.24 | " | " | 4,701 | 121 | 13,004 | 12,080 | | ||