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).
Use of plain tyres on experimental cars.
| Identifier | ExFiles\Box 1\7\ B001_X15 20 46 50 59-page107 | |
| Date | 1st November 1912 | |
| X20 Re Tyres for Experimental Cars. Mr Hives 1/11/12 TBB1/L11112. Please note that about half of the experimental cars should be run with plain tyres on all 4 wheels. | ||