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 India Tyre & Rubber Co. comparing their tyre's road contact and nonskid properties against a Dunlop tyre.
| Identifier | ExFiles\Box 157\6\ scan0132 | |
| Date | 6th January 1937 | |
| INDIA TYRE & RUBBER COMPANY, LTD. TELEPHONES: PAISLEY 4141/5. INCHINNAN SCOTLAND TELEGRAMS: INDIATYRE, RENFREW. OUR REF. PW/HDE. YOUR REF. 6th January, 1937. W. A.{Mr Adams} Robotham Esq., Messrs. Rolls-Royce Limited, DERBY. Dear Mr. Robotham, With reference to my letter of 9th December in which I promised to let you have some comparative data on the 6.00/17 India Super Tyre and the Dunlop Fort '90', we have taken prints of the road contact of the India Tyre as compared with the Dunlop Tyre and I am sending you herewith two prints showing the comparison. I think you will agree, after studying these two prints, that the India Tyre should prove a much better nonskid than the Dunlop. The total area of the India Tyre in contact with the road is 15% greater than the Dunlop. The road contact, that is, the rubber in contact with the road and the nonskid line length, that is, the length of the edges of the nonskid is about 17% to 18% greater than that of the Dunlop Fort '90'. I think that this comparison proves quite definitely that we have a tyre superior to the Dunlop Fort '90' in nonskid qualities. Mr. Richard Summers, as you probably know, is not satisfied with the amount of mileage which he is getting from his 5.50/18 India covers on his 4 1/4 litre Bentley. I suggested to him some time ago that, with your approval, we might try a larger section tyre, that is, the 6.00/17. | ||