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 comparing the weights of various chassis front end parts for Bentley, 25 HP, Ph.III, and Wraith models.
| Identifier | ExFiles\Box 87\4\ scan0115 | |
| Date | 1st May 1936 guessed | |
| CHASSIS FRONT END WEIGHTS. Parts | Bentley | 25 HP. --- | --- | --- lbs. | lbs. Front axle with control | 136.75 | 164.3 2 road springs | 38.2 | 56.4 2 shock dampers | 22.75 | 23 Engine cross members | 10.25 | 13 Front cross member with forgings | 10 | 11.5 Rear spring anchorage brackets | 3.25 | 3.25 Front shackle | 1.5 | 3.5 TOTAL: | 222.7 lbs | 275 lbs Parts | Ph.III | Wraith --- | --- | --- lbs. | lbs. 2 brake drum assemblies | 168.5 | 135 2 top triangular levers | 17.5 | 17.5 2 bottom triangular levers | 20.75 | 18 2 yoke pieces | 15.5 | 8.5 2 spring-pot assemblies | 106.25 | 105 Front cross member | 16.4 | 15 Front pan and rad. support | 58.1 | 50 Centre Stg. lever & X stg. tube | 19.5 | 16.5 Distance Piece & flanges thro' frame | 26 | 36 TOTAL: | 448.5 | 401.5 Parts | Wraith Torsion Bar --- | --- lbs. 2 brake drum assemblies | 135 2 top triangular levers | 14 2 bottom triangular levers | 14 3 piece cross steering | 22 2 shock dampers | 17 2 torsion bars | 20 Rear torsion bar supports | 8 Triangle brkts. anchorage to frame | 30 1st cross member | 15 2nd cross member | 20 TOTAL: | 295 lbs. | ||