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).
Comparison of road shock and ride comfort between standard high-pressure tyres and 6.75' Dunlop balloon tyres.
| Identifier | ExFiles\Box 29\1\ Scan237 | |
| Date | 8th August 1926 | |
| 4457 Hs.{Lord Ernest Hives - Chair} from Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}4/LG18. 8. 26. ROAD SHOCKS AND TYRE SIZE. X 4050 As a result of the numerous opportunities of comparison which we have been able to make between the standard tyres and the 6.75" Dunlop balloons, we believe that road shocks generally are slightly less conspicuous under Continental conditions with the larger tyres than with the standard straight sided high pressure tyres. The suspension of the car is of course vastly improved over bad roads by the big tyre. On the whole were we a customer, we would infinitely prefer to take the risk of experiencing a slight high speed wobble and have 6.75" tyres than to be subjected to the [strikethrough: riding] discomfort occasioned by high pressure tyres. Rm.{William Robotham - Chief Engineer} | ||