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 from the Tyre & Rim Association, USA, showing load and inflation data for 16 inch rims.
| Identifier | ExFiles\Box 170\3\ img177 | |
| Date | 7th December 1938 guessed | |
| TYRE & RIM ASSN. U.S.A. LOAD & INFLATION 16" RIMS 2000 1800 1600 1400 1200 9.00 8.25 7.50 7.00 6.50 6.25 6 PLY 4 PLY 1275# 1200# 1165# 1090# | ||