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).
Discussion with Dunlop regarding the performance of triple stud and traction tread tyres, focusing on wear, wobbling, and safety.
| Identifier | ExFiles\Box 29\1\ Scan250 | |
| Date | 15th September 1926 guessed | |
| contd :- -2- comfort than the standard straight sided tyre we had been running them at reduced pressures. However, we do not believe that this accounts for their wobbling tendencies. The Dunlop Co. consider that the triple stud tread tyre has very definite advantages for a balloon tyre over the traction tread. The main attribute of the triple stud is in their opinion that the smaller surfaces of contact promote more even wear. We have no very definite complaint to make of the way the 6.75" traction tread tyres wore in the recent tests in France, however. We pointed out that the triple stud tread from the very fact of it being a better non-skid was in our opinion definitely worse for high speed wobbles than the traction tread and that this was a very serious matter in a balloon tyre, the margin of safety of which was always small. We suggested that the Dunlop Co. should carry out high speed wobble tests on Brooklands and satisfy themselves on this point before submitting an alternative tread to us for extensive test. We believe they appreciated the fact that immunity from high speed wobbles was of greater importance on a big car than anti-skidding properties, and that they willcarry out some of the suggested tests. The question of the noise of the triple stud tread on the balloon tyre they stated to be of minor importance because owing to the large pattern, the note is low and cannot be confused with that of an axle. HS{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||