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).
Mileage and performance report on Rapson S-S Cord Tyres with Deflector Tubes.
| Identifier | ExFiles\Box 39\1\ Scan055 | |
| Date | 22th December 1923 | |
| REPORT ON 32 X 4½ RAPSON S-S CORD TYRES WITH DEFLECTOR TUBES. 22.12.23. Date. | Tyre No's | Where fitted. | Speedo-meter reading. | Days run. | Total mileage. | Remarks. 10.12.23 | 63146, 63253, 63141, 63124 | O.S. rear, N.S. rear, O.S. front, N.S front | 3,441, 3581 | 140 | 1,874 | 11.12.23, 12.12.23, 13.12.23 | " | " | 4064 | 483 | 2,357 | 14.12.23 | " | " | 4241 | 177 | 2,534 | Air pressure reduced 5 lbs. Front 35 lbs./sq.in. Rear 40 " 15.12.23, 16.12.23 | " | " | 4352 | 111 | 2,645 | 17.12.23 | " | " | 4538 | 186 | 2,831 | 18.12.23 | " | " | 4749 | 211 | 3,042 | 19.12.23 | " | " | 4978 | 229 | 3,271 | 20.12.23 | " | " | 5022 | 44 | 3,315 | Average speed - 30 m.p.h. | ||