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 horsepower lost in India tyres at various speeds.
| Identifier | ExFiles\Box 158\2\ scan0050 | |
| Date | 1st June 1939 | |
| DYNO TEST ON 2 REAR TYRES AXLE LOADING 1920 LBS. LOSSES IN INDIA TYRES 4 PLY. 7RIB EXPTL. PATTERN (6.50 x 16) PRESSURE (HOT) 33LB/IN² LOW STRETCH CORD RAYON H.P. LOST IN TYRES M.P.H LOW STRETCH RAYON STD. INDIA SUPER | ||