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).
Test comparing the diameter of a new tyre versus a well-worn tyre, noting the effect of stretch.
| Identifier | ExFiles\Box 1\7\ B001_X15 20 46 50 59-page105 | |
| Date | 14th September 1912 | |
| 3900 copy of card. X.20 Sept. 14th.12. TYRES, diameter etc. Test to show difference in diameter of worn tyre compared with new one, showing the amount of stretch which nearly balances the wear but not quite. New tyre at 80 lbs. sq.in 33¾" Test tyre " " " " 33½" (worn well) The above were taken with Dunlop tyres 895 x 135 mm. | ||