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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).
Comparison table of performance data for different 5.50/18 tyres under varying loads.

Identifier  ExFiles\Box 29\4\  Scan155
Date  22th November 1933
  
COMPARISON 5.50/18 (28x5.50) TYRES
INFLATION PRESSURE 35 LBS.

TABLE HEADERS:
LOAD | INFLATED O.D. | EFFECTIVE RADIUS | % DEFLECTION | AREA OF RUBBER IN ROAD CONTACT | AREA OF GROOVES | LENGTH OF SKID LINE
TYRE TYPES (Under each header category):
INDIA S.N.S. | INDIA S.S. | DUNLOP FORT | GOOD YEAR H.D.
(Note: Area columns include SQ.IN. units)

TABLE DATA:
Row: 8 CWT.
Inflated O.D.: 30.31 | 30.31 | 29.95 | 30.02
Effective Radius: 14.25 | 14.25 | 14.15 | 14.12
% Deflection: 14.70 | 14.70 | 13.80 | 14.80
Area of Rubber (SQ.IN.): 14.68 | 16.27 | 18.14 | 12.25
Area of Grooves (SQ.IN.): 7.86 | 6.90 | 4.56 | 5.85
Length of Skid Line: 56 2/3 | 64 1/2 | 48 | 51 5/8

Row: 9 CWT.
Inflated O.D.: " | " | " | "
Effective Radius: 14.15 | 14.17 | 14.08 | 14.05
% Deflection: 16.37 | 16.00 | 14.95 | 15.91

Row: 10 CWT.
Inflated O.D.: " | " | " | "
Effective Radius: 14.07 | 14.09 | 14.00 | 13.95
% Deflection: 17.75 | 17.30 | 16.30 | 17.61
Area of Rubber (SQ.IN.): 19.73 | 18.44 | 20.50 | 15.25
Area of Grooves (SQ.IN.): 8.42 | 7.60 | 5.50 | 7.30
Length of Skid Line: 72 2/3 | 75 | 56 1/2 | 69
  
  


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