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).
Technical data sheet detailing road speed, revolutions per mile, and radius increase for various tyre sizes.
| Identifier | ExFiles\Box 90a\3\ Scan137 | |
| Date | 5th August 1935 | |
| 15 5.8.35. E.R. Hall - Tyre Sizes. Road Speed 11/41 at 5000 at 100 MPH. 1. 5.50 x 18 Buttressed 118.5 89.25" 93 2. 5.50 x 19 Special 123 93.00" 96.75 3. 6.00 x 19 "90" 127 96.00" 99.75 4. 6.50 x 19 Special 129 98.00" 101.75 1. Road wheel revs/mile 709.9 2. " " " 681.2 3. " " " 659.9 4. " " " 644.9 Increase in radius at 110 M.P.H. = .6" " " circumference " = 3.75". Hs{Lord Ernest Hives - Chair}/F.Dodd. | ||