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).
Comparison table of individual chassis component weights between a Bentley and a Pontiac.
| Identifier | ExFiles\Box 88\3\ scan0111 | |
| Date | 5th February 1935 guessed | |
| COMPARISON OF BENTLEY AND PONTIAC WEIGHTS. HEAVIER THAN PONTIAC. SECTION OF CHASSIS. | % HEAVIER | BENTLEY | PONTIAC | DIFFERENCE BRAKE CONNECTIONS INCLUDING EQUALISERS LEVERS PEDALS AND LINKAGE. | 401% | 82 | 16 | 66 ROAD SPRINGS COMPLETE. | 67% | 117 | 70 | 47 EXHAUST SYSTEM. | 213% | 63 | 20.2 | 42.8 BATTERY. | 65% | 74 | 45 | 29 RADIATOR COMPLETE + WATER | 37% | 88 | 64 | 24 REAR AXLE COMPLETE WITH PROPELLOR SHAFT. | 9% | 236 | 217 | 19.7 TOOL KIT COMPLETE. | 102% | 31.8 | 15.6 | 16.2 PETROL TANK EMPTY. BOTH TANKS ASSUME 18 GALS. | 34% | 46.0 | 34.5 | 11.5 STEERING COMPLETE WITH SIDE STEERING TUBE. | 31% | 41 | 31.3 | 9.7 SHOCK ABSORBERS AND CONTROL. | 200% | 56 | 18.5 | 37.5 LIGHTER THAN PONTIAC. SECTION OF CHASSIS. | % HEAVIER | BENTLEY | PONTIAC | DIFFERENCE FRONT AXLE ASSEMBLY COMPLETE | 50% | 119 | 234 | 115 ENGINE UNIT AND GEARBOX. | 12% | 683 | 775 | 92 FRAME BARE. STEP IRONS BUT NO BRAKE GEAR. | 31.5% | 170 | 248 | 78 5 WHEELS AND TYRES | 2.5% | 257 | 264 | 7 BONNET | 14% | 44 | 51 | 7 299.2 | ||