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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).
Fitting of 6' tyres on a 20 HP car.

Identifier  ExFiles\Box 53\2\  Scan290
Date  19th November 1926
  
To PN.{Mr Northey} from Hs.{Lord Ernest Hives - Chair}
c. to BJ.
c. to Sg.{Arthur F. Sidgreaves - MD}

X4565

Hs{Lord Ernest Hives - Chair}1/LG19.11.26

20 HP. TYRES. X5820

With reference to PN{Mr Northey}5/EH18.11.26.

There is no fundamental reason why 6" tyres cannot be fitted on the 20 HP. car. The 6" tyres will fit on the same rims that are now standard on the 20 HP. for the 5¼" tyres.

The objections to the 6" tyre are, that they reduce the steering lock, and make slight alterations to the wing clearance etc.

If 6" tyres are fitted, we recommend the pressures in the front tyres are not reduced below 35 lbs/sq.in. This will ensure that the steering is not too heavy.

The rear tyres can be run with a low pressure if desired.

We have no fear of high speed wobbles on the 20 HP. car with 6" tyres.

Hs.{Lord Ernest Hives - Chair}
  
  


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