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).
Page 2, comparing the weights of hub and wheel components for different models.
| Identifier | ExFiles\Box 22\1\ Scan272 | |
| Date | 9th September 1925 | |
| R.R. 493A (50 M) (D.D. 21. 12-9-23) J.R.D. EXPERIMENTAL REPORT. -2- Expl. No. REF Hs{Lord Ernest Hives - Chair}/L/017 9.9.25 | DESCRIPTION. | T.series. Silver Ghost. lbs.ozs. | New PhantomCodename for PHANTOM I. lbs.ozs. | Hispano. lbs.ozs. | |-------------------------------------------------|--------------------------------------|-----------------------|-------------------| | HUB - SHELL ONLY { Dunlop - R.W. - | 8 4 | 10 9 | 9 2 | | | 11 5 | 11 5 | | | HUB - complete. | 16 11 | 17 2 | 14 9 | | | | 18 0 | | | WHEEL - without lock-nut and retaining ring. | | 40 3 | 32 0 | | | | 35 14 | | | WHEEL - locking device complete. | | 4 4 | 2 9 | | | | 2 6 | | | WHEEL - lock nut and retaining ring. | | 1 13 | 1 10 | | | | 1 10 | | Hs.{Lord Ernest Hives - Chair} | ||