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).
Over-size tyres, their dimensions, availability, and a list of suppliers.
| Identifier | ExFiles\Box 81\1\ scan0141 | |
| Date | 15th July 1914 | |
| F.R. 235a (150 H) (W.W. 604. 15-7-14) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 0702. -3- Wor{Arthur Wormald - General Works Manager}/Mcr2/B31714. nominal size, so that each maker appears to have an actual size of his own, and that the over-size tyres are simply tyres made more nearly correct to the actual nominal size of the tyre, thus the Continental over-size tyre is 34.5" in diameter and is, therefore, still ¼" less than what the standard tyre ought to be, but roughly speaking, we may say that an over-size tyre is merely a tyre made correct to the nominal dimensions of the standard tyre; this, therefore, makes the statement of the tyre makers sound rather absurd. Mr. Royce's other objection to over-size tyres was that they were difficult to obtain in this country. We think now that this objection has been removed. Glancing through a catalogue, we notice that the following firms supply over-size tyres:- Continental, Stelastic, Victor, Clincher, Spencer-Moulton, Pirelli, Columb (Prowodnik), Mackintosh, and we believe the Dunlop are making over-size tyres now. As to the wearing qualities of over-size tyres, standard Continental only average | ||