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).
Recommended tyre pressures from the Dunlop Company for various chassis weights.
| Identifier | ExFiles\Box 39\2\ Scan186 | |
| Date | 16th March 1926 | |
| X3538 HS.{Lord Ernest Hives - Chair} X4565 BY5/H.{Arthur M. Hanbury - Head Complaints} 16.3.26. I give below copy of tyre pressures as now recommended by the Dunlop Company for High Pressure Tyres, Medium Pressure Tyres, and Low Pressure or Balloon Tyres. I tried to get this information in time for Mr. Rowbotham, 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 HP. 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 4½" 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 | ||