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).
Comparison of Firestone, Stanwell, and Goodyear demountable rims based on weight, ease of use, and safety.
| Identifier | ExFiles\Box 3\2\ 02-page079 | |
| Date | 19th May 1920 | |
| To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to Co. c. to Sn.{Mr Sanderson} c. to S. c. to By.{R.W. Bailey - Chief Engineer} c. to Do. c. to XP. c. to OY. c. to Ma. COPY C.F & E.F.C. X.200 5 He1/LG19.5.20. X.3925 DEMOUNTABLE RIMS & STRAIGHT SIDED TYRES. X 3694 X.495D. Y 394c/2F We have now had a fair amount of experience with (X.89w.3) (X.39wc) Firestone, Stanwell and Goodyear demountable rims. Our criticism of these are as follows:- Ref: X.200. Weight. The following is the weight of a Dunlop detachable wheel fitted with these rims:- Plain Dunlop wheel - - - 38.5 lbs. Dunlop with Goodyear rim - - 41.75 " " " Firestone " - - 43.75 " " " Stanwell " - - 43.0 " Ease of mounting and demounting a tyre. It is possible to change a tyre on the Firestone rim much easier than either the Goodyear or the Stanwell rim. The Goodyear rim comes the next. The Goodyear is quite an easy rim to change, providing a proper tool is made for the job. The Goodyear people do not provide such a tool and if one tries with the ordinary screw-driver and tools which are in the usual kit, it is difficult. The Stanwell rim is the most difficult to change a tyre out even with this rim it would be reasonable if proper tools were made to do the job. Safety. We have carried out tests on the road with these three rims by fitting on a cover with a scrap inner tube and running the car at high speeds with a deflated tyre. We find that the best of the three rims as regards safety is c. | ||