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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).
Fitment of buttress tread Dunlop tyres on Phantom II spare wheel carriers.

Identifier  ExFiles\Box 13\5\  Spare05-page074
Date  30th October 1929
  
17600

COPY.

By.{R.W. Bailey - Chief Engineer} From Da{Bernard Day - Chassis Design}/Ev.{Ivan Evernden - coachwork}

c. to Hs.{Lord Ernest Hives - Chair}

Da{Bernard Day - Chassis Design}/Ev{Ivan Evernden - coachwork}2/M30.10.29.

X. 7600
X. 4050

PHANTOM II SPARE WHEEL CARRIERS.

Thank you for By2/G24.10.29.

We are surprised to find that the centre of the wheel carrier is 1" too low for the buttress tread Dunlop 33 X 6¾ tyre, as from consideration of the geometry this means that the wheel is from 2½" to 3" greater in dia. than the silent tread Dunlop of the same nominal dimensions.

If this is so we ought to reconsider our coach-work clearances, when, and if, these tyres are likely to be fitted.

Could you send us a drawing of the silent tyre, and also the buttress tread tyre giving the overall diameters, so that we can consider the whole question of fitting these tyres to a car.

Da{Bernard Day - Chassis Design}/Ev.{Ivan Evernden - coachwork}
  
  


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