Specification comparison between two tyre models, Fort '90' and MA-2.
| Identifier | ExFiles\Box 157\1\ scan0153 | |
| Date | 23th November 1934 | |
| Technical Department, FORT DUNLOP 23.11.34. 6.00-19 : M.A-2 v. {VIENNA} '90'. Fort '90'. MA-2. Rim - 3.62 in. 3.62 in. Diameter - 31.90 in. 31.80 in. Width - 6.25 in. 6.10 in. Effective Radius - 15.05 in. 15.0 in. Pattern Depth - 11.3 m {Mr Moon / Mr Moore} /m 10.2 m {Mr Moon / Mr Moore} /m. Tread Depth - 15.4 " 14.5 " Tread Width - 116.0 " 115.0 " Contact. Land Area - 22.3 sq.in. 20.6 sq.in. Ellipse Area - 29.9 " 28.8 " Ellipse Width - 4.1 in. 4.0 in. Ellipse Length - 8.1 in. 8.25 in. Contact Pressure - 65.4 lbs/sq.in. 70.5 lbs/sq.in. Average Cover Weight - 34.6 lbs. 32.4 lbs. | ||
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).