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 comparing the tractive resistance of standard tyres versus balloon tyres at various speeds.
| Identifier | ExFiles\Box 160\2\ scan0028 | |
| Date | 24th May 1925 | |
| 45 LBS/D" INFLATION STANDARD TYRE. 30 LBS. REAR. 25 LBS/D" FRONT BALLOON. TESTS 49 G.B. TOTAL CAR T.R. LBS. PER TON. M.P.H. TRACTIVE RESISTANCE COMPARISON 40/50. 33 x 5 STANDARD TYRES 33 x 8 BALOON TYRES W.A.R. X4577 | ||