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).
Specification table for the Summers car, detailing buffer clearance and wheel weights.
| Identifier | ExFiles\Box 47\1\ Scan331 | |
| Date | 21th January 1926 guessed | |
| 117-MC - SUMMERS CAR. | Buffer clearance. | Weight on wheel without passengers. | With average passengers. | |-------------------|-------------------------------------|--------------------------| | | cwt. qrs. lbs. | | | Near front | 11 3 0 | 1½" | | Off front. | 11 2 21 | 1½" | | Near rear. | 11 3 14 | 4 3/4" | | Off rear. | 11 3 0 | 4 3/4" | | ||