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).
Calculations for rear wheel weight using two alternative methods.
| Identifier | ExFiles\Box 114\4\ scan0131 | |
| Date | 4th June 1937 guessed | |
| 34Ex Rear Wheel weight 91/6 Total weight on rear tyres with 2" buffer clearance = 3780 lbs. + unsprung weight - 631 " Total = 4411 lbs. or alternatively Taking approximate unloaded weight ref 36Ex as 3215 lbs + Tools, food etc (attached sheet) 1162 lbs + One rear seat passenger = 180 lbs Total = 4557 lbs | ||