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).
List of weights for various 20 HP wheel and tyre combinations.
| Identifier | ExFiles\Box 159\1\ scan0172 | |
| Date | 19th August 1928 | |
| +3725 19.8.28 WEIGHT. 20 HP. WHEEL AND TYRE. X.5810 X.5820 X.4050 X.3725 +3809 (1) Dunlop 21" well base wheel fitted with 33 X 5.25" tyres. 60 lbs. (2) Dunlop 21" well base wheel fitted with 33 X 6" tyres. 62.5 lbs. (3) Dunlop 19" narrow hub well base wheel fitted with 31 X 6" tyre. 57 lbs. Hs{Lord Ernest Hives - Chair}/AJL. | ||