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).
Performance graph plotting vehicle speed (M.P.H.) against engine speed (R.P.M.) for various Dunlop racing tyres and axle ratios.
| Identifier | ExFiles\Box 90a\3\ Scan089 | |
| Date | 8th June 1935 | |
| DUNLOP RACING TYRES (FOR F.R. HALL'S CAR) 11/41 RATIO = 3.72:1 11/43 RATIO = 3.91:1 Tyre Circ (Effective) 6.5 x 18 = 100" TYRE CIRCUMFERENCE (EFFECTIVE) - 6.00 x 18 = 93.7 TYRE CIRCUMFERENCE (EFFECTIVE) - 6.00 x 19 = 96.4 ROAD WHEEL REVS/MILE - 6.00 x 18 - 676 ROAD WHEEL REVS/MILE - 6.00 x 19 - 658 M.P.H. ENGINE R.P.M. 11/41 AXLE 11/43 AXLE 6.00 x 19 6.00 x 18 6.00 x 19 6.00 x 18 | ||