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 performance and durability during a mileage test for chassis 9-G-111.
| Identifier | ExFiles\Box 58\1\ Scan005 | |
| Date | 26th August 1925 | |
| R.R. 493A (50H) (D.B. 175 25-9-24) J.H.D. EXPERIMENTAL REPORT. Expl. No. REF: Chateauroux. 26.8.25. COPY. TYRES RECEIVED FOR CHASSIS 9-G-111. Fitted to chassis in Derby Received from Paris 13.6.25 ............ 6 Received from Paris 17.6.25 ............ 6 Received from Paris 25.6.25 ............ 6 Received from Paris 1.7.25 ............ 6 Received from Paris 14.8.25 ............ 6 Tyres discarded during first 10,000 miles test. No.1 after 3,840 miles - worn to canvas. No.2 after 2,580 miles - worn to canvas. No.3 after 2,373 miles - worn to canvas. No.4 after 3,840 miles - worn to canvas. No.5 after 1,687 miles - worn to canvas. No.6 after 2,020 miles - worn to canvas. No.7 after 2,770 miles - worn to canvas. No.8 after 3,947 miles - Burst - unfit for further use. No.9 after 609 miles - Worn to canvas. No.10 after 1,819 miles - Walls badly damaged. No.12 after 1,165 miles - Worn to canvas. No.13 after 1,105 miles - Worn to canvas. No.14 after 1,663 miles - Worn to canvas. No.15 after 3,640 miles - Worn to canvas. No.16 after 4,330 miles - Burst - unfit for further use. No.18 after 1,550 miles - Burst - unfit for further use. No.27 after 430 miles - Cut through by horse-shoe. Tyres still in running condition at end of first 10,000 miles test. No.19 after 1,070 miles. No.20 after 1,000 miles. No.28 after 1,700 miles. Tyres discarded during second 10,000 miles test. - starting on 6.8.25. No.19 after 2,388 miles. - worn to canvas. No.20 after 2,623 miles. - worn to canvas. No.23 after 877 miles. - Burst - useless. No.24 after 1,568 miles. - Worn to canvas. No.28 after 474 miles. - Burst & useless. contd:- | ||