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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).
Correcting the wheel revolutions per mile for a 7 x 20' Silent Tread Fort Reinforced Dunlop tyre.

Identifier  ExFiles\Box 65\2\  scan0316
Date  15th May 1930
  
x7820.
To Oy. From Hs{Lord Ernest Hives - Chair}/AJL.
c. to By.{R.W. Bailey - Chief Engineer}
c. to Ds.
c. to EV.{Ivan Evernden - coachwork}

Hs{Lord Ernest Hives - Chair}/AJL.1/MJ.15.5.30.

x3895
x7820
x5820.

TYRE SIZES.

With reference to Hs{Lord Ernest Hives - Chair}/AJL.2/MJ.8.5.30., the figure of 630.5" quoted for the wheel revs/mile of the 7 x 20" Silent Tread Fort Reinforced Dunlop tyre is incorrect, it should read 618 revs/mile.

Hs{Lord Ernest Hives - Chair}/AJL.
  
  


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