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).
Ground clearance measurements for a Rover 20 HP car at maximum bump.
| Identifier | ExFiles\Box 127\3\ scan0197 | |
| Date | 6th October 1937 guessed | |
| Pmm 1091. Rover 20 H.P. Ground Clearance. O.S. frame rear, 2.250 " " " front. 3.875 NS.{Norman Scott} frame rear, 2.250 " " " front, 4.000 underneath axle. Rear Exhaust Pipe .250 under petrol tank. Front exhaust pipe under clip - - - 2.375 Clearance taken with car on max bump front & rear together Ruan / F1 | ||