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 suspension geometry for various car models.
| Identifier | ExFiles\Box 124\3\ scan0405 | |
| Date | 26th August 1936 guessed | |
| Buick Century 1936. | Wraith ll. | Ph.lll. | Ph.lll Wraith Levers. Tyre Size. | 6.5 x 16 | 7 x 17 | 7 x 18 | 7 x 18 Out of Centre Point. | 2.200" | 2.110" | 2.212" | 2.212" Pivot Caster | 3° | 1° | 1° | 1° Pivot Camber | 3° 48' | 3° 30' | 2° 30' | 2° 30' Wheel Camber Bump. | -1° 15' | -0° 53' | -4° 5' | -0° 7' Approx. Wheel Camber Normal Position. | +0° 45' | +1° | +1° | +1° Wheel Camber Rebound. | -1° 21' | -1° 35' | +3° 52' | -2° Approx. Wheel Centre Movement Bump. | 4" | 3.080" | 3.68" | 3.125" Wheel Centre Movement Rebound. | 4" | 4.900" | 4.34" | 4.025" | ||