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).
Page discussing the theory of toe-in and wheel gather for cambered wheels to achieve optimal tyre wear.
| Identifier | ExFiles\Box 178\1\ img112 | |
| Date | 13th July 1926 guessed | |
| - 13 - [Text from top diagram] Y X - Y = 1/4" TO 3/8" X A theory is also propounded that with 'cambered' wheels toe-in is necessary to produce the best tyre wearing results, the idea being that the wheel acts as the base of a cone and is always tending to roll outwards, it should therefore be turned in to counteract this. While an ingeneous theory, we do not know of a case where it has been substantiated in practice. The amount of toe-in given to a car rarely exceeds 3/8". That is, the distance between the tyre centres at the rear of the front wheels is seldom more than 3/8" greater than a similar measurement taken in front of the wheels. For a somewhat obscure reason, toe-in indirectly affects [Text from bottom diagram] 'TOE IN' OR 'WHEEL GATHER' AS RELATED TO WHEEL CAMBER. θ A C WHEEL FORMS BASE OF A CONE LYING ON ITS SIDE. IF ALLOWED TO ROLL FREELY WOULD FOLLOW PATH 'A' THEREFORE TOED IN TO 'C' TO COUNTERACT THIS TENDENCY. contd. | ||