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).
List of car weights including axle loads with passengers and individual component weights for the wheel and brake assembly.
| Identifier | ExFiles\Box 154\1\ scan0136 | |
| Date | 5th April 1934 guessed | |
| 40/50 Car. 22-EX. CAR WEIGHTS. With four } Front 2570 lbs. passengers } Rear 3550 lbs. Weight of road wheel and tyre 81 lbs. Weight of hub, brake drum, stub axle, carrier plate, levers and ball races etc. 60 lbs. Weight of brakes, shoes, linings and levers, etc. 13½ lbs. Total weight of one comp. wheel with brakes. 154.4 lbs. | ||