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).
Design drawing of a tyre tread pattern with associated calculations.
| Identifier | ExFiles\Box 29\4\ Scan239 | |
| Date | 25th March 1917 | |
| TOTAL AREA - 28.10 SQ INS GROOVE - 7.82 - SOLID - 20.28 - N.S. COCK - 78 3/4" B 550/17 Redesigned 3.25/17. Rim 36 Lbs 11 Cwts Load | ||