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).
Letter from Michelin Tyres discussing the comparative costs and benefits of different tyre sizes and twin systems.
| Identifier | ExFiles\Box 81\1\ scan0123 | |
| Date | 13th February 1914 | |
| KM1/18. - 3 - 13th February 1914. actually less favourable to the 895 x 150, as it is an established fact that the running of tyres in pairs as in our twin system greatly increases the length of the service given by them, while in the event of accidental destruction of a tyre, the cost of replacement would be £11.9.0. in the case of the 895 x 150 as compared with only £6.12.6. in that of the 880 x 120. We think that such figures in an instance where the comparison is made of six tyres against four provide an ample justification for our second reason for refraining from following the example of our competitors in the marketing of the oversize tyres. Assuring you of our best attention at all times, We are, dear sirs, Yours faithfully, THE MICHELIN TYRE CO. LTD. | ||