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).
The discontinuation of 6¾' section tyres and their replacement with 7' section tyres for 20' rims.
| Identifier | ExFiles\Box 45\2\ Scan229 | |
| Date | 14th February 1930 | |
| SG.{Arthur F. Sidgreaves - MD} From HS.{Lord Ernest Hives - Chair} c. to PN.{Mr Northey} & Aust. X4050. HS.{Lord Ernest Hives - Chair}1/MJ.14.2.30. 20" RIMS. 7" TYRES. x)810 x)820 x4050 The tyre makers have decided to discontinue the manufacture of the 6¾" section tyre and to replace it with the 7" section. The 7" section tyre on the present wheel introduces a number of difficulties such as raising the car and alterations to the spare wheel carrier and gear ratio. At the moment Dunlops' are producing the 6¾" tyre especially for R.R. but this means that if a customer replaces his tyre, he will most probably only be able to obtain one of the 7" section which will fit on to the present wheel. All 7" section tyres are "Fort" tyres that is they have thicker tread and therefore have better wearing qualities. We are bound to come in line with the tyre makers and we are satisfied, after a number of tests, that the 7" tyre for the 20" introduces no difficulties but at the same time it does not give us an appreciably lower car. HS.{Lord Ernest Hives - Chair} | ||