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).
Table of buffer clearance and wheel weight measurements for the Summers Car.
| Identifier | ExFiles\Box 67a\1\ scan0242 | |
| Date | 31th August 1932 guessed | |
| 117-MC - SUMMERS CAR. Buffer clearance. | Weight on wheel without passengers. | With average passengers. | cwt. qrs. lbs. | --------------------------------------------------------------------------------- Near front | 11 3 0 | 1 1/4" --------------------------------------------------------------------------------- Off front. | 11 2 21 | 1 1/2" --------------------------------------------------------------------------------- Near rear. | 11 3 14 | 4 3/4" --------------------------------------------------------------------------------- Off rear. | 11 3 0 | 4 3/4" | ||