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).
Performance and availability of new silent tread tyres for Phantom and 20 HP cars.
| Identifier | WestWitteringFiles\S\September1928-October1928\ Scan135 | |
| Date | 9th October 1928 | |
| To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} C. to DJ. WOR.{Arthur Wormald - General Works Manager} C. to E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} C. to EY. ORIGINAL! Hsl/LG9.10.28. CAR - TYRES. [Handwritten:] X9820 [crossed out] X5820 [circled] X4050. Phantom cars are now being despatched with tyres having silent treads. These are the 6.75" on 21" rims. The silent tread tyres in the 20 HP. sizes are not yet available, but we expect to receive samples very shortly. We are satisfied that the silent tread pattern provides a reasonable non-skid; for side slips they are quite as effective as the old pattern, but we have the impression that the wheels spin more easily on a greasy road. As soon as the 20 HP. tyres are available we will change them on the car at WW. Hs.{Lord Ernest Hives - Chair} | ||