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).
Page 2 of a letter to W.A. Robotham discussing weight differences between types of tyres, wheels and hubs.
| Identifier | ExFiles\Box 30\5\ Scan048 | |
| Date | 21th March 1935 | |
| W.A. ROBOTHAM, ESQ. 21st. March, 1935. - 2 - 6 ply, which will account straight off for 4 or 5 lbs per tyre (i.e. approximately 2 lbs. being the difference between a 6.00-16 Aero Cushion tyre and a 5.50-18 Speed Special tyre, and another 2 or 3 lbs. for the difference between 4 ply and 6 ply) and the remainder being the difference in weight between the two sorts of wheels and hubs. If there is any further information I can get for you, please do not hesitate to ask me. Yours sincerely, Rothes_ | ||