Fitment issues of a larger Dunlop tyre on a Phantom II spare wheel carrier.
| Identifier | WestWitteringFiles\T\March1929-December1929\ Scan231 | |
| Date | 30th October 1929 | |
| BY. {R.W. Bailey - Chief Engineer} FROM DA {Bernard Day - Chassis Design} /EV. {Ivan Evernden - coachwork} Copy to - HS. {Lord Ernest Hives - Chair} ORIGINAL DA {Bernard Day - Chassis Design} /EV {Ivan Evernden - coachwork} 2/M30.10.29. x7600. x4650 -> PHANTOM II. SPARE WHEEL CARRIERS. Thank you for BY2/G241029. We are surprised to find that the centre of the wheel carrier is 1" too low for the buttress tread Dunlop 33 X 6 3/4 tyre, as from considerations of the geometry this means that the wheel is from 2 1/2" 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).