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).
Graph showing the effect of speed on the effective radius of two different sizes of Dunlop Fort Silent tyres.
| Identifier | ExFiles\Box 45\2\ Scan299 | |
| Date | 12th September 1930 | |
| EFFECT OF SPEED ON THE EFFECTIVE RADIUS OF A 7.00-20 DUNLOP FORT SILENT TYRE AND A 6.00-19 DUNLOP FORT SILENT TYRE INFLATED TO 35 LBS. SQ. INCH. INCREASE IN RADIUS. M.M'S SPEED. MILES PER HOUR. 7.00-20. 6.00-19. | ||