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 comparison table between Michelin and standard 6.75' Dunlop tyres, tubes, and wheels.
| Identifier | WestWitteringFiles\S\September1928-October1928\ Scan186 | |
| Date | 26th October 1928 guessed | |
| contd :- -2- Particulars of the Michelin compared with the standard 6.75" Dunlop are :- Weight. | DUNLOP 6.75 - 21" rims. | MICHELIN. 17 X 50. Tyre. | 36 1/4 lbs. | 35 lbs. Tube. | 5 lbs. | 4 lbs. Tyre, tube and wheel. | 75 lbs. | 72 lbs. Hs{Lord Ernest Hives - Chair}/Sn.{Mr Sanderson} | ||