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} | ||
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).