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 dimensions for Bentley I and Bentley III models with different wheel configurations.
| Identifier | ExFiles\Box 98\2\ scan0011 | |
| Date | 30th August 1937 guessed | |
| BENTLEY I & BENTLEY III COMPARISONS. (Cont'd.{John DeLooze - Company Secretary}) Dimension. B.II. 5.500 x 18 wheels. B.III. 17x6 & 16x6.5 wheels. Diff. B.III. 16 x 6.250 wheels. Diff. Top of Sill to Underside of Cantrail. 38.500 43.000 +4.500 - - Rad. Back to Front Wheels. 1.800 behind 3.200 in front 5.000 - - Dash to Front Wheels. 38.000 34.500 -3.500 - - Dash to Rear Wheels. 88.000 89.500 +1.500 - - Bottom of Steering wheel to Dash. 34.350 34.000 -.350 - - Bottom of Steering wheel to Top of Rear Squab Board. 60.150 63.150 +3.000 - - Leg Room Front Seat. 47.000 46.250 -.750 - - Leg Room Rear Seat. 46.000 43.500 43.500 Nil. - - Bottom of Steering wheel to C.L. Rear Axle. 53.650 55.500 +1.850 - - Top of Steering wheel to Top of Squab Board. 68.500 72.250 +3.750 - - Dash to Rear of Back Seat Squab Board. 94.500 97.150 +2.650 - - | ||