Letter from Dunlop Rubber Co. Ltd. detailing tyre revolutions per mile at 100 mph for three specific sizes.
| Identifier | ExFiles\Box 157\3\ scan0100 | |
| Date | 26th July 1939 | |
| 1332 DUNLOP RUBBER CO.,LTD. TELEGRAPHIC ADDRESS: "DUNLOPS, PHONE, BIRMINGHAM" TELEPHONE: ERDINGTON 2121 (P.B.X) EXTENSION NO. 395. YOUR REF: Rm {William Robotham - Chief Engineer} /Gry. {Shadwell Grylls} 4/MH. {M. Huckerby} OUR REF: HEP/WS.1606.C. FORT DUNLOP ERDINGTON BIRMINGHAM 24 Messrs. Rolls-Royce Ltd., DERBY. For the attention of S.H.Grylls, Esq. 26th July 1939. Dear Sirs, In thanking you for your letter of the 21st, we would advise you that the approximate revs per mile at 100 miles per hour of the three sizes mentioned in your letter, are as follows :- * 6.00-19 6 m {Mr Moon / Mr Moore} /m Track Tyres ... 652 6.50-19 " " " " ... 635 6.50-16 4 m {Mr Moon / Mr Moore} /m " " ... 713 We would mention that these figures have been calculated for an axle load of 17 cwts at an inflation pressure of 45 lbs/sq. inch in each case. Yours faithfully, For DUNLOP RUBBER CO.,LTD. [Signature] Manager, Car Manfrs.Division. * Please note the 6.50 x 19 tyre should be 8.5 m {Mr Moon / Mr Moore} /m and not 6 m {Mr Moon / Mr Moore} /m as stated. | ||
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).