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 listing Bentley tyre weights and prices for different sizes and makes.
| Identifier | ExFiles\Box 158\1\ scan0175 | |
| Date | 29th January 1938 | |
| Tyre File 1339 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. | ||