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).
Comparison table of wheel and tyre weights in pounds for various car models and projects.
| Identifier | ExFiles\Box 10\5\ 05-page005 | |
| Date | 19th March 1935 | |
| 19.3.35. TABLE 1 COLUMN HEADERS: Vulture 6.50 x 18, Vulture 7 x 18, SpectreCodename for Phantom III 7.50 x 17, 20/25 6.00 x 19, Projected 20/25 6.00 x 17 ROW: Wheel & Tyre weights - lbs. DATA: 64.25, 73.25, 69.00, 64.0, 61.25 TABLE 2 COLUMN HEADERS: Bentley 5.50 x 18, Projected Bentley 6.25 x 16, Buick 6.25 x 16, Graham 7 x 16, Essex 6.25 x 16 ROW: Wheel & Tyre Weights - lbs. DATA: 50.62, 45 approx., 46.25, 53.375, 43.125 | ||