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 characteristics of balloon tyres, their effect on suspension, and riding comfort.
| Identifier | ExFiles\Box 45\2\ Scan011 | |
| Date | 1st January 1927 guessed | |
| contd :- -8- should be taken to allow the tyres to warm up before beginning fuel measurement. The appended curve shews the decrease in rolling resistance occasioned by the increase in the temperature of the tyre. IV: TYRES AND SUSPENSION. (a) Low speed riding characteristics of balloon tyres. Riding complaints at low speeds are usually of one of two kinds :- (1) The car is uncomfortable on a good road at between 20 and 30 m.p.h. This is a feature confined almost exclusively to the Phantom. Our experience is that balloon tyres will not cure this trouble, but that if run at very low pressures the benefit conferred will be appreciable. (2) Shocks when dropping into pot-holes causing body rattles. Balloon tyres undoubtedly take the 'edge' off potholes and very considerably reduce coachwork depreciation, even at low speeds. (b) High speeds. The benefit conferred by balloon tyres when travelling at high speeds over Continental roads is enormous. The general increase in the life of the body-work is an excellent testimony of their efficiency in this respect. V: MISCELLANEOUS TYRE INFORMATION. (a) Variation in gear ratio due to low pressure tyres. The actual effective dia. of a balloon tyre when slowly rolled is slightly less than that of the contd :- | ||