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).
Data table of vehicle weights and suspension buffer clearance measurements for various car models.
| Identifier | ExFiles\Box 11\3\ 03-page297 | |
| Date | 20th November 1930 | |
| CAR. TOTAL WT. EMPTY. EMPTY REAR AXLE WT. REAR SPRINGS. MEASURED BUFFER CLCE. 4 PASS. BUFFER CLCE. BY CHART. 18-EX. Two spare wheels. 4990 lbs. 25 cwt. 1200 3.8 3.7 19-EX. One spare wheel. 5362 lbs. 27 cwt. 1300 3.6 3.62 20-EX. One spare wheel. 5300 lbs. 27.25 1300 3.7 3.6 58-GN. 27.55 1320 3.65 3.6 25-EX. One spare wheel. 5460 27.125 1315 3.75 3.6 Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} 2011.30. 9 | ||