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).
Requesting a 25/30 piston and comparing the weight of rear road springs and hubs against Cadillac and Bentley models.
| Identifier | ExFiles\Box 174\2\ img043 | |
| Date | 23th March 1937 | |
| C O P Y. GFW. March 23rd/37. Please send Oy. a complete 25/30 piston fitted with rings and in particular with the L shaped centre ring. We have got to accept that our rear road springs are ridiculously heavy. Two 1125 lbs rear road springs for the Cadillac 60, rate 115 lbs/1" weigh 70 lbs the pair. We have never broken a Bentley thick leaf spring on the road and unless the bump test shows something silly we should get the 25 production sets we ordered on the cars as soon as we can. We should also see that Wraith figures are reasonable. Timken bearings in hubs seem to save a great deal of weight and are perfectly reliable. Cadillac 60 hubs and bearings front weigh 3.89 lbs the pair. Rm.{William Robotham - Chief Engineer} | ||