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).
Weight specifications for a latest type Dunlop W.B. wire wheel with cover and tube.
| Identifier | ExFiles\Box 159\1\ scan0166 | |
| Date | 19th March 1928 | |
| X3725 X3725 / 88240 19th. Mar. 1928. Weight of latest type Dunlop W.B. wire wheel 21" rim fitted with 33 X 6.75" Dunlop cover and " " " tube. Balanced - complete 73 lbs. Standard - 78 lbs. Rm.{William Robotham - Chief Engineer} | ||