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).
Selecting the quietest and most flexible tyres, with sizes specified for Phantom, 20 HP, 'SS', and India models.
| Identifier | ExFiles\Box 45\2\ Scan095 | |
| Date | 6th October 1928 | |
| hs.{Lord Ernest Hives - Chair} from R.{Sir Henry Royce} c. to BJ. Wor.{Arthur Wormald - General Works Manager} c. to C. BY.{R.W. Bailey - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} SG.{Arthur F. Sidgreaves - MD} X4050 R1/M6.10.28. CAR TYRES. X.5820 X.7820 X.4080 We are anxious to use the quietest tyres of the most flexible type (for good low speed riding,) of the smallest wheel diameters (for low appearance of cars) that will give us road clearance. I believe there is some doubt about the life of the Dunlop silent tyres as an effective non-skid. This point should be cleared up. If there is no disadvantage I understand we shall be using : For Phantoms 6 1/2 silents on 21" rims. " 20 HP. 6" " " 20" " " 'SS{S. Smith}' 6 1/2" " " 21" or 20" rims. For India 4.6" " " 19" rims. Not 'Forts', and certainly not 'super-forts'. T. | ||