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 concerning tyre wear, pressures, and providing new tyres for testing.
| Identifier | ExFiles\Box 39\2\ Scan086 | |
| Date | 3rd October 1921 | |
| X3538 By Appointment To H.M. The King DUNLOP RUBBER CO LTD FOUNDERS OF THE PNEUMATIC TYRE INDUSTRY. TELEGRAMS: "DUNLOPS, BIRMINGHAM." TELEPHONE Nos. (6 LINES): ERDINGTON 261 TO 266. STATION: CASTLE BROMWICH (MID. RY.) GOODS: TO DUNLOP SIDINGS, CASTLE BROMWICH. NEAREST CAR ROUTE: ERDINGTON CAR FROM STEELHOUSE LANE TO SALFORD BRIDGE RD. TO FORT DUNLOP WORKS. REGISTERED OFFICES: DUNLOP HOUSE, 1, ALBANY STREET, LONDON. N.W.1. ALL COMMUNICATIONS TO BE ADDRESSED TO THE FIRM. PLEASE QUOTE REFERENCE FORT DUNLOP, ERDINGTON, BIRMINGHAM. Development Supt., 3rd October, 1921 Messrs Rolls Royce, Ltd., Nightingale Road. Derby. Ref HSL/LG for attention of Mr. Hives. Dear Sirs, We are obliged for your favour of the 29th. ulto. and we are very interested in the information you are good enough to give us as to tyre wear obtained at different pressures. There are many factors which require to be taken into consideration beyond that of tread wear. We quite appreciate that this can be considerably minimised by a reduction of air pressure, for the two principal reasons - firstly that the reduction of pressure increases the contact area of tyre with road, so reducing the load per unit of contact area, and secondly it reduces the compression arising from the more highly inflated tyre leaving the road when the surface is bumpy, and accelerating whilst clear of the road, and of course retaking its grip of the road with considerable compression. We wish to see very much higher mileages than those you name, and can in fact now assure you of much better tread wear from a modification of the tread which considerably increases the contact area under the higher pressures. I am sending you over for your test a couple of these tyres, and should be glad if you could arrange to have these fitted to our rear wheels for your test. | ||