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).
Average tyre mileages for different sizes on Bentley cars, noting some were removed due to splitting.
| Identifier | ExFiles\Box 158\2\ scan0004 | |
| Date | 21th March 1939 | |
| 1339 - Lillie Hall to W. Rm{William Robotham - Chief Engineer}/FD.{Frank Dodd - Bodies} RC{R. Childs}1/L/21.3.39. Re: Bentley Tyres. - - - - - - - - - With reference to your memo Rm{William Robotham - Chief Engineer}/FD.{Frank Dodd - Bodies}5/JH.20.3.39. I give below average tyre mileages on Bentleys for 5.50 x 18 and 6.50 x 17 tyres. * 6.50 x 17 - Front 10,700. Rear 9,700. 5.50 x 18 - " 13,600. " 9,200. Of course, we have not been running on the 6.50 x 17 tyres for very long but I will be pleased to let you have further records as time goes on, should you require them RC.{R. Childs} * Please note that these tyres were removed on account of their splitting. | ||