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).
Specification sheet detailing the weights of Dunlop standard and wheelbase wheel assemblies for the 40/50 HP model.
| Identifier | ExFiles\Box 42\1\ Scan022 | |
| Date | 19th November 1925 | |
| X3809 19.11.25. +4050 Dunlop standard 40/50 HP. Wheel 32 X 4½ 43 lbs. } Fitted complete Cover 33 X 5 38 lbs. } 86 lbs. Tube 33 X 5 5 lbs. } Dunlop wheel base wheel rim 21". Cover wired edge type 29 lbs. } Fitted complete Tube. 4½ " } 67 lbs. Wheel 33½ " } | ||