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).
Explaining variations in tyre rolling diameters and their 5% effect on the effective gear ratio.
| Identifier | ExFiles\Box 45\2\ Scan050 | |
| Date | 3rd December 1927 | |
| To DA.{Bernard Day - Chassis Design} from Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} c. to BY.{R.W. Bailey - Chief Engineer} EP.{G. Eric Platford - Chief Quality Engineer} c. to E.{Mr Elliott - Chief Engineer} CWB. X4050 Hs{Lord Ernest Hives - Chair}/Aml/LG3.12.27. X4565 / X4050 Replying to your DA{Bernard Day - Chassis Design}1/M23.11.27. herewith the required information. We have indicated why the rolling diameters of tyres varied so much when given in different reports. You will see the cumulative limits can make a difference of as much as 5% in the effective gear ratio. Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} | ||