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 Dunlop Rubber Co. discussing tyre failures and comparing 7-inch and 6.5-inch tyre characteristics.
| Identifier | ExFiles\Box 157\3\ scan0109 | |
| Date | 16th August 1939 | |
| 1332. DUNLOP RUBBER CO.,LTD. TELEGRAPHIC ADDRESS: "DUNLOPS, PHONE, BIRMINGHAM" TELEPHONE: ERDINGTON 2121 (P.B.X) EXTENSION No. YOUR REF: OUR REF: FORT DUNLOP ERDINGTON BIRMINGHAM 24 16th August, 1939. W.A. Robotham, Esq., Rolls-Royce, Ltd., D E R B Y. Dear Robotham, I thank you for your letter of the 11th instant. We shall be glad to receive and to report on the 6.50/16 and 7.00/16 tyres which have failed in France. Referring to your second paragraph, we do not think there is much difference between a 7" and a 6½" tyre, with regard to throwing treads. On the whole, we should think the 7" tyre would be a little better because of its larger diameter and reduced R.P.M, but this advantage is just about offset by the reduction of pressure in the 7", to give the same cushioning capacity as the 6½" on the narrower rim. Yours sincerely, A Healey ................... 1888 1938 DUNLOP 50 YEARS OF GROWTH | ||