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 increase in a tyre's effective radius in millimetres against speed in miles per hour.
| Identifier | ExFiles\Box 157\3\ scan0134 | |
| Date | 1st June 1925 | |
| COPY INCREASE IN EFFECTIVE RADIUS OF 33 x 5 TYRE INFLATED TO 70 LBS/SQ IN. AND CARRYING 1320 LBS LOAD. INCREASE IN RADIUS - MILLIMETRES SPEED. MILES PER HOUR. R.D. JUNE, 1925. | ||