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).
Blueprint detailing the dimensions and design of a 7' x 20' Dunlop modified silent tread, fort reinforced tyre.
| Identifier | ExFiles\Box 45\2\ Scan351 | |
| Date | 18th May 1931 | |
| 7" x 20" DUNLOP MODIFIED SILENT TREAD TYRE (FORT REINFORCED) .750 1.1875 57° 1.1875 DEPTH OF TREAD .4375 .712 1.1875 3.218 3.712 5.250 1.00" 18.5.31. | ||