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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).
Table detailing the dimensions and weights of various tyres at recommended pressure.

Identifier  ExFiles\Box 29\4\  Scan248
Date  12th December 1934
  
12th December, 1934.

Dimensions taken at maximum recommended load for section and corresponding recommended pressure as shown in our inflation tables.

Rim. Tyre & Tube Weight. X Section Inflated. Eff. Rad. O.D. Inflated. Rolling Radius.

6.00/18 3.25/18 29.1 lbs. 6.32" 14.35" 30.76" 14.64"
Super Special. 4.34 "

5.50/19 3.25/19 27.5 lbs. 6.07" 14.65" 31.36" 14.94"
Super Special. 4.04 "

6.00/19 3.62/19 30.44 lbs. 6.51" 14.92" 32.00" 15.22"
Super Special. 4.53 "

6.00/20 3.62/20 31.86 lbs. 6.51" 15.42" 33.00" 15.73"
Super Special. 4.71 "

5.50/18 3.25/18 26.52 lbs. 6.09" 14.12" 30.28" 14.40"
Speed Special. 3.88 "

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