Rolls-Royce Archives
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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.
  
  


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