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).
Design drawing of a tire tread pattern with area calculations.

Identifier  ExFiles\Box 29\4\  Scan238
Date  25th March 1917 guessed
  
A (circled)
5.50/17 R
3.25/17 R
36 lbs
11 Cwt Load

TOTAL AREA - 26.00 SQ. INS
GROOVE " - 8.58 "
SOLID " - 17.42 "
N.S. EDGE - .77
  
  


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