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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).
Tyre mileage, the reliability of low-pressure tyres, and the fitting of 6.75 inch tyres.

Identifier  ExFiles\Box 17\3\  Scan108
Date  6th October 1926 guessed
  
contd :-

-2-

therefore the mileage as we would anticipate, was low.
Our records shew that we get less than one-half the mileage
during the hot weather compared with wet Winter weather.
This is confirmed by Messrs. Dunlops experience.

On experimental cars we have not found the low
pressure tyres any more ~~reliable~~ to puncture. We have found
however that if the car is run with the tyre flat only a
very short distance, the tube is destroyed.

From our experience to date, we should say
that we are likely to get slightly less mileage with the low
pressure tyres - somewhere in the region of 10%.

We have got a to remember that in fitting 6.75"
tyres, we are not introducing a novelty: these have been
standard on Daimlers and the 6-cyl. Bentley and several
other cars, for a considerable time.

HS.{Lord Ernest Hives - Chair}
  
  


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