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).
Report page detailing tests on tyre behaviour, pressures, car control, and shock damper settings.
| Identifier | ExFiles\Box 17\3\ Scan087 | |
| Date | 1st September 1926 guessed | |
| contd :- -4- advantages. We cannot therefore see any argument in favour of their adoption. The behaviour of the tyres fitted with the triple stud tread was perceptibly worse than with the traction tread (d) 33 X 5" standard s.s. tyre. With 6.5 lbs. friction in the steering, 1500 lbs. side steering tube springs, and being accurately balanced, these tyres give a very good steering at 45 lbs/sq.in. However, a little out of balance soon spoils the steering at high speeds. At 35 lbs/sq.in. the steering is not nearly so nice with these tyres, as it suffers from lack of selectiveness. The most distressing feature is the way in which rattles are emphasised the moment these tyres are fitted. The suspension also suffers emphatically all round on Continental roads. IV. REAR TYRE PRESSURES AND CAR CONTROL. Condition of car. Michelin 6.2" tyres. standard s.s. tube. 1500 lbs. springs. 45 lbs/sq.in. Control and steering selectiveness very fair, but car crashes on bad roads, due to high tyre pressures. 35 lbs/sq.in. Control and steering selectiveness very good. 30 lbs/sq.in. Control not quite so good. 25 lbs/sq.in. Definite loss of selectiveness and tendency to wander. V.{VIENNA} SHOCK DAMPER SETTING. Condition of car. Michelin 6.2" tyres. (a) Front. 35 lbs. up - 100 lbs. down. Prevents any wobble building up but shocks extreme contd :- | ||