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).
Numerous disadvantages of a new tyre size, focusing on negative steering effects and required modifications.
| Identifier | ExFiles\Box 45\2\ Scan170 | |
| Date | 16th September 1929 guessed | |
| -2- under running conditions. Owing to the increase in width of the tread, the steering is very much heavier when shunting and is heavy and uncertain up to 35 m.p.h., especially noticeable in traffic. At high speeds any unselective feeling is definately increased, the steering tends to wander excessively. Road shocks and joggles are not appreciably affected. It is not possible to appreciate any alteration in the riding qualities. The adoption of this size of tyre necessitates an alteration to the rear spare wheel carrier, it cannot be carried on the present type. The reduction in steering lock angle is caused by the increase in width of the tyre and is a big disadvantage. The disadvantages are many, there is only one advantage, viz:- longer life of tyre due to increased thickness of tread, we are not in a position to give any figures for this; we have not yet run a set of these tyres sufficiently far to wear them out. We feel that the disadvantages of this tyre are so many that they outweigh its one advantage; it would be better to put up with the short life of the present 33 x 6.75" tyre than to involve ourselves in alterations to spare wheel carriers etc., and what is more serious, to spoil the steering. HS{Lord Ernest Hives - Chair}/AJL. | ||