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).
Feasibility of fitting oversized 150mm section tyres onto standard wheels for the 40/50 chassis.
| Identifier | ExFiles\Box 81\1\ scan0058 | |
| Date | 24th February 1919 | |
| R.R. 235 B(200 T) (S.F. 103, 25-10-18) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2244 EH. from BY.{R.W. Bailey - Chief Engineer} X3044 U. 40/50 CHASSIS. RE TYRES. Mr Royce is asking us to make an 895 x 150 mm tyre standard for all 4 wheels where the single tyres are used, The point which he raises in his memo, but of which I am not quite certain is, that he apparently requires a tyre 150 mm in section to fit on to the standard Dunlop wire wheel, which is suitable for 895 x 135. I would like to know whether this is actually possible, as he appears to suggest that it is what we are actually doing in the case of 49 GB. If this is actually what is being done at the moment when we fit 150 mm section tyres, does it mean that the outside diameter of the tyre is increased and that the 895 is merely a nominal diameter and not the actual? [Handwritten note] apparently One tyre B requires an "oversize" BY.{R.W. Bailey - Chief Engineer} 895 x 135 wheels admit 150 m/m section instead of 135 m/m By | ||