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).
Photograph showing a close-up of two tyres with a block tread pattern.
| Identifier | ExFiles\Box 171\2\ img059 | |
| Date | 1st August 1932 guessed | |
| 7.00 - 20 REINFORCED A-2 (W) 7.00 - 21 MA2 | ||