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 effects of standard and balloon tyres on vehicle noise, vibration, and ride quality.
| Identifier | ExFiles\Box 53\2\ Scan087 | |
| Date | 21th January 1924 | |
| -3- EXPERIMENTAL REPORT. Expl. No. 4565 REF:Hsl/LG21.1.24. tyres they should be fitted to an old car which has developed the usual body and chassis rattle. It is then remarkable the effect they have in reducing noises. It is impossible yet to give a value for the reduced wear and tear of the chassis and body but from our own experience we should say there is very much less wear. The riding of the car is very considerably improved. In the case of the 40/50, Balloon tyres reduce to a very considerable extent the chunking in the drive when going over a bad road. (8) There is one peculiar effect we get since we have been using lower tyre pressures - it occurs on the std. tyres with low pressure and also to an increased extent on the balloon tyres. The effect is, if we run tyres over cobbles or bad sets we get a vibration which can be felt distinctly on the axle and frame and also sitting in the seats. The vibration evidently tunes up with other parts of the car which causes a note. This effect entirely disappears if we pump the tyres up hard. It does not appear to be affected to any extent by the pattern of the tread. We have demonstrated this complaint to the Dunlop Technical people who are considering this point. At present they have no solution for this. The question of tyre noise - this is with us both on the standard tyres and on the Balloon tyres. So far Dunlops have not been successful in producing a tread which retains the non-skid qualities and is yet silent. HS.{Lord Ernest Hives - Chair} | ||