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).
Letter from Michelin Tyre Co Ltd. detailing recommended inflating pressures for Cable Tyres based on axle load.
| Identifier | ExFiles\Box 39\2\ Scan117 | |
| Date | 22th October 1921 | |
| Ref: AL/S 81 Fulham Road, London, S.W.3. 22nd October, 1921. Dear Sirs, In reply to your letter of the 15th instant, reference Sp{Mr Spinney}6/DG15.10.21. we have pleasure in giving you below a table showing the maximum load per axle for each section of tyre, we advise for a given inflating pressure:- CABLE TYRES Section Max: load per Axle Pressure per Sq: Inch Single Twin Cwts Cwts 90 16 70 14 62 12 56 105 18 70 16 60 120 24 70 20 60 18 56 120 42 70 36 60 30 56 135 32 70 28 60 25 56 135 60 70 55 60 50 56 150 30 60 32 65 35 75 155 35 65 40 75 45 90 155 67 65 77 75 80 80 87 90 We are, Dear Sirs, Yours faithfully, Michelin Tyre Co Ltd., [The word 'COPY' is stamped across the middle of the document.] | ||