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).
The weight savings of the latest Dunlop well-based wheel compared to the standard Dunlop wheel.
| Identifier | ExFiles\Box 29\1\ Scan078 | |
| Date | 25th September 1925 | |
| R.R. 495A (50 M) (D.D. 21. 12-8-25) J.H.L. EXPERIMENTAL REPORT. Expl. No. +457 REF: Hs{Lord Ernest Hives - Chair}3/LB25.9.25. To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. BJ. c. to RG.{Mr Rowledge} E.{Mr Elliott - Chief Engineer} c. to DA.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} c. to Wor.{Arthur Wormald - General Works Manager} DUNLOP WHEELS. +3725 We find that the latest Dunlop wheel complete with tyre weighs 67 lbs. compared with 86 lbs. for the present standard wheel and tyre. This means that there is a saving of 19 lbs. per wheel, or 114 lbs. per car when these wheels are carried. Below are particulars of weights :- DUNLOP STANDARD. Wheel 32 X 4 1/2 ----- 43 lbs. Cover 33 X 5 ----- 38 lbs. Tube 33 X 5 ----- 5 lbs. Wheel complete with cover, tube and balance weights :- 86 lbs. DUNLOP WELL-BASED WHEEL. Wheel 33 1/2 lbs. Cover 29 lbs. Tube 4 1/2 lbs. Wheel fitted complete with cover and tube :- 67 lbs. We have so far only received one sample wheel - we are expecting others today. We will make tests on the effect of the reduction in weight on wobbles. We anticipate there will be a marked improvement. We are arranging to run a set of these tyres 10,000 miles. There may be some delay at the moment, however, in obtaining the tyres. Hs.{Lord Ernest Hives - Chair} | ||