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 a tyre manufacturer discussing suitable tyre options and specifications for a Colonial Bentley.
| Identifier | ExFiles\Box 30\5\ Scan043 | |
| Date | 19th March 1935 | |
| +462 INDIA TYRE & RUBBER COMPANY, LTD. TELEPHONES: PAISLEY 4141/5. INCHINNAN SCOTLAND TELEGRAMS: INDIAOWL, RENFREW. OUR REF. PW/HDE. YOUR REF. 19th March, 1935. W. A.{Mr Adams} Robotham, Esq., Messrs. Rolls-Royce Limited, DERBY. Dear Mr. Robotham, Answering your letter of 14th March, we have now gone into the question of India Real Low Pressure Tyres for the Colonial Bentley. We have measured these tyres at the pressure which we think would be most suitable and underloads of 900 lbs. and 1200 lbs. We used the figures 1200 and 900 as we calculated from figures which you supplied us some time ago that this would be the load on the rear and front tyres on the Bentley when the car was fully loaded. We attach herewith the dimensions for the 6.00/16, 6.50/16 Aero Cushion Tyres and 5.50/18 Speed Special Tyre. We believe that six ply Aero Cushion Tyres would be most suitable and we feel that the 6.00/16 would be quite capable of carrying the load and, of course, would be lighter than the 6.50/16. However, there is a considerable decrease in the Effective Radius from the 5.50/18 Speed Special and this may be an objection against fitting the 6.00/16 in view of the fact that you wish to increase the road clearance. - Contd. - | ||