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).
Availability and performance of straight-sided tyres, comparing cord construction with woven fabric.
| Identifier | ExFiles\Box 45\1\ Scan209 | |
| Date | 20th June 1921 | |
| R.R. 884. (100 T) R.H. 798. 10-12-20. G 2947 To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. c. to BN.{W.O. Bentley / Mr Barrington} c. to E.{Mr Elliott - Chief Engineer} c. to Da.{Bernard Day - Chassis Design} c. to BY.{R.W. Bailey - Chief Engineer} c. to EP.{G. Eric Platford - Chief Quality Engineer} X4050 STRAIGHT-SIDED TYRES. The Dunlop Company are now in a position to supply straight-sided tyres and have stocks throughout the country. All the other tyre makers are either making or in the process of making straight-sided tyres. Practically all the tyre makers are also changing from the woven fabric to the cord fabric construction tyre. We have been running the Dunlop tyres during the last 12 months on experimental cars and have assisted them in a number of tests to overcome the noise caused by the tread. The final pattern which they have now decided upon is quite good in this respect. Apart from the Dunlop tyres, we have been running - Goodyear, Goodrich, Kelly Springfield, United States Royal Cord and Firestone tyres, all of which are straight-sided tyres and of the cord construction. The results of our tests show, undoubtedly that with the cord construction of fabric, greater mileage can be obtained than with the woven fabric. The greater mileage is obtained by the fact that the cord fabric does not burst. With all our experience with the cord construction straight-sided tyres, we have never had a case of the tyre bursting until the rubber tread has been worn down. With the Dunlop Magnum tyre with the woven fabric, we have frequently had a tyre burst beforeit has completed 1000 miles and before the contd:- | ||