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).
Table detailing Bentley tyre weights and prices.
| Identifier | ExFiles\Box 157\6\ scan0190 | |
| Date | 29th January 1938 | |
| 1336 29th. January 1938. BENTLEY TYRE WEIGHTS AND PRICES. Size | Make | Ply | Weight lbs.-ozs. | | Price (actual). --- | --- | --- | --- | --- | --- | | | | Cover | Tube | 5.50 x 18 | India | 6 | 26-8 | 3-12 | 33/8d. 6.50 x 17 | India | 6 | 34-14 | 4-9 | 43/-d.{John DeLooze - Company Secretary} 6.50 x 16 | India | 6 | 31-8 | 3-2 | 33/5d. 6.50 x 16 | Dunlop | 6 | | | 39/4d. | ||