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 performance and non-skidding characteristics of Dunlop 90 type tyres.
| Identifier | ExFiles\Box 157\1\ scan0159 | |
| Date | 15th January 1935 | |
| W/S - C. from Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} c. to Roy.{Sir Henry Royce} x4050 Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}11/KW.15.1.35. Dunlop Tyres. With reference to C9/C.14.1.35, we have had enough experience with the Dunlop 90 tyre to say there is nothing extraordinary with regard to its non-skidding characteristics. The following is a report we have had from Hancock :- "21-G-IV. We have now run 2,947 miles with the "90" type tyres. The opinion of all the drivers is that steering no difference, either in lightness or selectivity. Two drivers were of the opinion that skidding was more pronounced, myself and the others did not perceive any difference. In my opinion riding is harder with the same tyre pressures, i.e., 30 lbs. rear and 35 lbs. front." We are not surprised that these tyres tend to ride harder for the same tyre pressures than our present standard, because they have a flatter tread. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||