Photograph showing a close-up of two vehicle tires and their tread patterns.
| Identifier | ExFiles\Box 157\1\ scan0075 | |
| Date | 25th October 1932 guessed | |
| REINFORCED 7.00 - 20 (M) 7.00 - 21 MA2 | ||
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).