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).
Tyre tread pattern print with specifications for a Goodyear H.D. tyre.
| Identifier | ExFiles\Box 29\4\ Scan154 | |
| Date | 22th November 1933 guessed | |
| - GOODYEAR H.D. - SIZE 5.50/18 (28x5.50) TOTAL AREA = 18.10 SQ. INS. ROAD CONTACT " = 12.25 " GROOVE " = 5.85 " SKID LINE LENGTH = 51 7/8" LOAD = 8 CWTS. | ||