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).
Table of various tyre sizes, nominal diameters, and manufacturers.
| Identifier | ExFiles\Box 1\7\ B001_X15 20 46 50 59-page130 | |
| Date | 16th January 1915 guessed | |
| TYRES 920x150 nom dia 36.2. 108 34.4 grooved Dunlop 107 1/2 34.2 S.S. Dunlop TYRES 815x105. n. dia 32.1 102 7/8 32.7 S.S. Michelin TYRES 820x120 n. dia 32.3 99 3/8 31.6 grooved Dunlop TYRES. 810x90 n.d. 31.9 #s 101. 32.1 S.S. Dunlop. 100 5/8 32 Ribbed Palmers. TYRES 34x4 1/2" 108 3/8 both. 34.5 Plain Miller 107 3/8 34.1 34x5" (Plain Kelly-Springfield) | ||