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).
Correspondence with The India Tyre & Rubber Co. Ltd. regarding tyre pressure performance and ordering tyres for testing.
| Identifier | ExFiles\Box 29\4\ Scan203 | |
| Date | 13th July 1934 | |
| 4462 Exptl. Dept. Hs{Lord Ernest Hives - Chair}/No.14/KW. 13th July, 1934. The India Tyre & Rubber Co.Ltd., Inchinnan, SCOTLAND. Your Ref: JY/IK. For attention of Mr. Young. Dear Sirs, We thank you for your letter of the 12th July with attached correspondence. We have always appreciated that the tyre pressure rose 6 or 7 lbs/sq.in. when the car was driven hard in hot weather. The view we took was that the tyre pressures we recommended were always lower than the tyre manufacturers would like from the point of view of tyre life; therefore it was rather an advantage that when the car was driven hard in hot weather, the conditions under which wear is most severe, the pressures automatically compensated themselves by increasing to somewhere about the theoretically desirable figure. For town work, where comfort is largely dictated by the tyre pressures, we imagine they would always be about the measured inflation pressure under static conditions. With regard to the 6" tyre, we should like to know the effective rolling circumference and the weight of this tyre. We should also like to run some of these tyres on our French tests. There is no doubt that the steering is very susceptible to tyre size and we are therefore reluctant to recommend 6" tyres until we have had some experience with them. We are therefore instructing our accounts Dept. to pass you an order for six tyres, 6" section. We shall be glad if you would send these to G.W.Hancock, Esq., c/o.{Mr Oldham} The Hotel de France, Chateauroux, Indre, France. Yours faithfully, For Rolls-Royce Ltd. | ||