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 India Tyre & Rubber Co. Ltd. to Mrs. E.R. Hall regarding tyre dimensions and specifications.
| Identifier | ExFiles\Box 157\6\ scan0037 | |
| Date | 7th April 1936 | |
| COPY: Y.1336 7th April, 1936. Mrs. E.R. Hall, Hartley Cottage, Kirkburton, Yorkshire. Dear Mrs. Hall, Confirming our Telephone conversation this afternoon the overall diameter of the 6.00/19 tyre on a 4.00 x 19 rim is 31.95" at 38 lbs. inflation pressure. The effective radius with a load of 9 cwts. (standing) is 15.22" and at 60 m.p.h. it increases to 15.37". The overall diameter of this tyre on a 3.62 x 19 rim is the same as on a 4.00 x 19 rim. The 3.62 rim will be quite satisfactory from our standpoint. Yours faithfully, INDIA TYRE & RUBBER CO. Ltd., | ||