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).
Test report on Dunlop Silent Tyres, evaluating steering and ride quality at various pressures and with different wheel setups.
| Identifier | ExFiles\Box 13\3\ 03-page222 | |
| Date | 8th July 1930 guessed | |
| 7 x 20 Dunlop Silent Tyres. At 40 lbs. - Steering very light at high speeds, not so positive as 1/2" Off-set wheels. Good for joggles. At 35 lbs - Steering not quite so light but joggles slightly worse. At 30 lbs. - With the exception of the steering becoming on the heavy side and joggles much worse, the riding of the front of the car remains very much the same. The best combination of wheels and tyres (1/2" Off-set wheels and Dunlops Silent tyres at 35 lbs). ------------------------- Front Wings off and Dumbell on with 2- 100 lbs. weights. Standard Dunlop Silent Tyres at 45 lbs/sq.in. At 45 lbs. - Very bad for joggles, almost at wobble at high speed in places. At 40 lbs - Best Combination. Very good for joggles and balance, steady and positive. At 35 lbs - Increased bucking of front of car, slightly worse for joggles than at 40 lbs. but not so bad as at 45 lbs. The best steering with the dumbell is at 40 lbs. tyre pressure. ------------------------- Hs{Lord Ernest Hives - Chair}/F.{Mr Friese} Dodd. | ||