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).
The sizes of various tyres when fitted and inflated to 80 lbs.
| Identifier | ExFiles\Box 1\7\ B001_X15 20 46 50 59-page097 | |
| Date | 30th July 1912 | |
| X20 X.20. July, 30th 1912. REPORT RE SIZES OF TYRES. The diameter of various tyres is as below, fitted and pumped up to 80 lbs:- Michelin 935 mm tyre stands 34 1/4" high, i.e. 6.75% low. Dunlop 935 mm tyre stands 35 1/4" high, i.e. 4% low. Dunlop 895 mm tyre stands 33" high, i.e. 7% low. Michelin 895 mm tyre stands 33" high, i.e. 7% low. | ||