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 for U.S. Royal Flat Base 7.00' x 20.0' tyres and wheels.
| Identifier | ExFiles\Box 42\5\ Scan066 | |
| Date | 24th July 1930 | |
| 83895 BY/RD. From Hs{Lord Ernest Hives - Chair}/AJL. Hs{Lord Ernest Hives - Chair}/AJL.1/MJ.24.7.30. U. S. ROYAL FLAT BASE 7.00" x 20.0" TYRES. These tyres and wheels have the following dimensions :- Max. width of tyre section - 6.5". " " " " tread - 4.4375". Unloaded circumference at 35 lbs/sq.in - 107". Effective running " " " " - 101.5" Weight of wheel complete = 33 lbs. 14 ozs. " " outer cover = 37 lbs. 4 ozs. " " inner tube = 5 lbs. 2 ozs. " " rubber band = 13 ozs. Total weight of built up and balanced wheel and tyre = 79 lbs. 4 ozs. Hs{Lord Ernest Hives - Chair}/AJL. | ||