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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).
Steering tests conducted at Brooklands with different tyre types and pressures.

Identifier  ExFiles\Box 13\3\  03-page221
Date  4th June 1930
  
BROOKLANDS. STEERING TESTS. 4.6.30.

Tests were carried out with Standard Dunlop Silent tyres. U.S.A. 7 x 19 Royal, and 7 x 20 ½" off set special.

U.S.A. 7 x 19 at 40 lbs. pressure.
Steering slightly more positive than with Dunlop Silent tyres at high speed, but bad for joggles, (about same in intensity as Dunlop at 35 lbs.)

At 35 lbs - Steering heavier and joggles worse.

" 30 lbs. - Steering unsteady at wobbling point both at high and low speeds, very bad for joggles, impossible over rough road conditions.

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7 x 20 ½" off set special wheels.

40 lbs. - Steering has about the same degree of selectivity as U.S.A. very steady at speed and joggles compare about the same as standard 7 x 20 tyres at 35 lbs.

At 35 lbs. - A slight improvement on tyres at 40 lbs. pressure, steady and positive, very selective (an excellent combination.)

At 30 lbs. - Joggles slightly worse but not so bad as U.S.A. tyres at same pressure.
Radiator steady at all speeds.

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