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).
Copy of recommended tyre pressures from Dunlop Co. for various chassis and tyre types.
| Identifier | ExFiles\Box 53\2\ Scan195 | |
| Date | 16th March 1926 | |
| COPY. Y4585 X3538 Y4565 Hs.{Lord Ernest Hives - Chair} from BY.{R.W. Bailey - Chief Engineer} BY5/H16.3.26. I give below copy of tyre pressures as now recommended by the Dunlop Co. for high pressure tyres, medium pressures tyres, and low pressure or balloon tyres. I tried to get this information in time for Rm.{William Robotham - Chief Engineer} but failed. Possibly you would like to mail it on for him, so that it will be available when he arrives at the south of France. BY.{R.W. Bailey - Chief Engineer} 40/50 CHASSIS. High pressure 5" Medium 6" Balloon 6.75" Not over 24 cwts. 45 lbs. 40 lbs. 30 lbs. Not over 28 cwts. 50 lbs. 45 lbs. 35 lbs. Not over 35 cwts. 55 lbs. 55 lbs. 40 lbs. 20 HP. CHASSIS. High pressure 4 1/2" Medium 5.25" Balloon 6" Not over 16 cwts. 40 lbs. 35 lbs. 25 lbs. Not over 20 cwts. 45 lbs. 40 lbs. 30 lbs. Not over 25 cwts. 50 lbs. 50 lbs. 35 lbs. -------------------------- BY.{R.W. Bailey - Chief Engineer} | ||