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).
Comparison of specifications for the standard and new types of Dunlop 21' rim wire wheels.
| Identifier | ExFiles\Box 159\1\ scan0169 | |
| Date | 26th July 1928 guessed | |
| X3725 STANDARD DUNLOP WIRE WHEEL 21" RIM. X8840 Weight 34 1/4 lbs. Length of hub shell 8.70" NEW TYPE DUNLOP WIRE WHEEL 21" RIM. Weight 32 lbs. Length of hub shell 7.30" Rn.{Mr Robinson} | ||