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 a tyre manufacturer discussing the suitability of 4-ply versus 6-ply low-pressure tyres for export vehicles.
| Identifier | ExFiles\Box 30\5\ Scan049 | |
| Date | 22th March 1935 | |
| x4462 INDIA TYRE & RUBBER COMPANY, LTD. TELEPHONES: PAISLEY 4141/5. INCHINNAN SCOTLAND TELEGRAMS: INDIAOWL, RENFREW. OUR REF. PW/IK. YOUR REF. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}8/KW. 22nd March, 1935. W.A. Robotham, Esq., Messrs. Rolls-Royce Ltd., DERBY. Dear Mr. Robotham, Replying to your letter of March 20th, the fitment on the Buick, as you know, is a 6.25-16 four ply tyre. On the Essex, however, our information is that 6.00-16 four ply cover is fitted as standard equipment and not 6.25-16. I believe that perhaps in my letter of 19th March I should have explained more fully that we were recommending a six ply tyre in the 6.00 and 6.50 section due to our previous experience in export markets. When the real low pressure tyre started to come out to the overseas markets fitted as original equipment to American cars, our dealers and distributors reported that these tyres, which were four ply, were giving a great deal of trouble due to bruises and blow-outs and we therefore decided to make our real low pressure tyres in six ply construction as well as four ply in order to meet the conditions overseas. We have scored heavily in certain markets by doing this and although we have sold hundreds of these tyres, complaints have been practically nil. In view of this experience, I would not recommend fitting 4 ply low pressure tyres on a car such as the Bentley which is going overseas. - Continued - | ||