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).
Chart of front and rear track measurements for various steel wheel and cast iron drum configurations.
| Identifier | ExFiles\Box 153\4\ scan0078 | |
| Date | 19th June 1940 | |
| Rm {William Robotham - Chief Engineer} /FJH. {Fred J. Hardy - Chief Dev. Engineer} Ev. {Ivan Evernden - coachwork} 1/JH.19.6.40. STEEL WHEELS & C.I. DRUMS. Chart of Front & Rear Tracks Etc. WIDE TRACK Original out of centre point. NARROW TRACK. Original out of centre point. Front. OCP. Rear. Front OCP. Rear. Note :- Alum. drums increase the track front & rear. 4 x 16 with 6.50 tyres. - - - (Corniche Production. 56.260 2.170 58.000.) 4 x 16 Tyres 6.000. - - - 55.710 1.895 57.450 @ 4.5 x 16 6.50 tyres 58.000 2.170 58.950 56.260 2.170 58.000 5.0 x 16. 7.000 tyres 58.550 2.445 59.500 56.810 2.445 58.550 5.5 x 16 7.500 tyres 59.200 2.770 60.150 57.460 2.770 59.00 @ - as projected but never made - calls for new centre pressing. | ||