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).
Report comparing mileage and performance for large, small, and standard tyre sizes.
| Identifier | ExFiles\Box 88\2\ scan0239 | |
| Date | 7th May 1938 | |
| S/W Rm.{William Robotham - Chief Engineer}.from Lp.{Mr Lappin} G&T [crossed out] 261. Lp.{Mr Lappin}11/WT7.5.38 B-50-LS. FSH RH{R. Hollingworth} [crossed out] I confirm having run 9,300 miles on the large size tyres. Better riding, good adhesion, wet and dry. I have previously done about 10,000 miles on smaller size tyres, but not the same model. Standard tyres under my driving conditions generally only do 4,000 - 5,000 miles. Lp.{Mr Lappin} | ||