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).
Test results for 5.50/18 India Speed Special tyres under specific load and speed conditions.

Identifier  ExFiles\Box 29\4\  Scan202
Date  4th July 1934
  
4th July, 1934.

TESTS ON 5.50/18 INDIA SPEED SPECIAL.

Load - 9 cwts. Run at 63 m.p.h. for 30 minutes.
Room Temperature - 80º F.{Mr Friese}

Starting Pressure. Final Pressure. Increase in Pressure. % Increase. Final Temp. of Tread.
20 lbs. 30 lbs. 10 lbs. 50%. 172º F.{Mr Friese}
22 " 31 " 9 " 41%. 169º F.{Mr Friese}
25 " 34 " 9 " 36%. 165º F.{Mr Friese}
28 " 36 " 8 " 28.5%. 158º F.{Mr Friese}
30 " 38 " 8 " 26.5%. 158º F.{Mr Friese}
32 " 40 " 8 " 25%. 158º F.{Mr Friese}
35 " 44 " 9 " 25.7%. 152º F.{Mr Friese}


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