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 with a graph showing rolling resistance of a cord tyre against tyre temperature and inflation pressure.
| Identifier | ExFiles\Box 158\1\ scan0016 | |
| Date | 14th January 1927 guessed | |
| contd :- -7- between the tyre at the two inflation pressures illustrated in this test. Hence it may be said that the increase in petrol consumption due to fitting balloon tyres will not be more than 5%. This is confirmed by the results of our 10,000 miles test in France. The appended graphs arranged from figures supplied by Messrs. Dunlops show how little is the difference in rolling resistance between a balloon and high pressure tyre when both are inflated to 40 lbs/sq.in. and that this difference accounts for less than 40 yds. in rolling to rest, over a distance of 1100 yds. (b) Decrease of rolling resistance with temperature rise. When carrying out consumption tests of any kind, care [Graph Text] ROLLING RESISTANCE OF 895 x 135 CORD TYRE SPEED - 50 M.P.H. ROLLING RESISTANCE LBS WT/TN 1. EFFECT OF TYRE TEMPERATURE TYRE STARTED COLD 80LBS / SQ.IN. TIME - MINUTES 2. EFFECT OF INFLATION PRESSURE INFLATION PRESSURE (LBS SQ. IN.) | ||