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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).
Out of balance issues caused by different brands of tyres and inner tubes.

Identifier  ExFiles\Box 4\3\  03-page15
Date  21th March 1912
  
Sir Barrington X401
Cromwell [handwritten]

REPORT ON OUT OF BALANCE CAUSED BY TYRES.

[Stamped: Partially legible circular stamp reading RECEIVED MAR...]

Mr Iadin. March 21st 1912.

The outer covers I find are generally quite satisfactory, Continentals and Michelins O.K. Dunlops vary from 2 to 5 ozs out of balance.

Inner tubes are out of balance as below

[Handwritten notes and signatures below]

Tube joints Hobs Hobs Hobs
Valves Hobs Hobs Hobs

Continental. Michelin. Dunlop.

[Handwritten note on right side:]
Joints in tubes vary in length Dunlop longer than Michelin
CJ [initials]
  
  


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