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).
Table comparing axle ratios, tyre sizes, rolling circles, and engine RPM for various cars.
| Identifier | ExFiles\Box 156\4\ scan0134 | |
| Date | 3rd November 1943 guessed | |
| Header Row: (1) CAR, (2) AXLE RATIO, (3) TYRE SIZE, ROLLING CIRCLE., (4) MEASURED, (5) STATIC CHART., (6) AT 30 M.P.H. CHART, (7) EST. AT 60 MPH., ENGINE R.P.M. AT 60 M.P.H., (8) MEASURED, (9) ESTIMATED, (10) PROPOSED. Row 1: 1 B50., 10/43, 7.00 x 16, 90.250, 89.000, 90.000, 91.000, 3,020, 3,000, 3,000 Row 2: 2 B50., 9/37, 7.00 x 16, 89.000, 89.000, 90.000, 91.000, 2,920, 2,860, 2,900 Row 3: 3 B50., 11/41, 6.500 x 16, 86.625, 86.500, 87.500, 88.000, 2,720, 2,680, 2,700 Row 4: 4 B50., 9/37, 7.00 x 16, 89.000, 89.000, 90.000, 91.000, 2,920, 2,860, 2,900 Row 5: 8 BV., 9/37, 6.500 x 16, 87.750, 86.500, 87.500, 88.000, 2,960, 2,960, 2,960 Row 6: 9 BV, 9/37, 6.500 x 16, 86.625, 86.500, 87.500, 88.000, 3,000, 2,960, 3,000 Row 7: 1R1, 11/41, 6.500 x 16, 86.625, 86.500, 87.500, 88.000, 2,720, 2,680, 2,700 Row 8: 1BT{Capt. J. S. Burt - Engineer}1, 10/43, 6.00 x 16, 85.250, 84.000, 85.000, 86.000, 3,190, 3,160, 3,170 | ||