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).
Specifications for two tyre sizes, including effective circumference, width, rim size, and revolutions per mile.
Identifier | ExFiles\Box 114\4\ scan0003 | |
Date | 22th January 1937 | |
2 22.1.37. Standard Dunlop 7 x 18 96" effective circumference. Width unloaded - 6.9375" Rim.4.000" Road Wheel Revs/mile - 660 7.50 x 18 - 98.5" effective circumference Width unloaded - 7.8125" Rim 5.000" Road wheel Revs/mile - 643. | ||