Letter from Dunlop Rubber Co. regarding proposed amendments to tyre and rim specifications for Extra Low Pressure tyres.
| Identifier | ExFiles\Box 157\1\ scan0333 | |
| Date | 23th April 1936 | |
| Copy. DUNLOP RUBBER CO. LIMITED, FORT DUNLOP, ERDINGTON, BIRMINGHAM. HEP/HM. {Capt. W. Hallam - Head Repairs} 804.D. 23rd.April 1936. Rolls-Royce Limited, Derby. Yours sincerely, (P.E.Price) Dear Sir, In view of the recently published I.A.E. Data Sheets W.10.R. in connection with the fitment of E.L.P. tyres and rims, it is felt that the layout of that part of our Data Card reference SC3/5S. sent to you on the 11th.February, dealing with Extra Low Pressure tyres, could with advantage be modified. It is suggested, therefore, that the following amendments be included on our list to bring this into line with standard practice. Dunlop Standard. Tyre section & Rim Dia. Rim Section. Overall Dia. Overall width. Alternative rim size. Overall dia. Overall width. 5.00-16 3.00D. 26.25 5.00 2.75D 26.25 4.90 6.25-16 4.50D. 28.80 6.60 4.00D. 28.80 6.35 6.50-16 4.50D. 29.20 6.75 4.00D. 29.20 6.50 7.50-15 5.50E. 30.40 7.95 5.00E. 30.40 7.75 7.50-16 5.50E. 31.10 7.90 5.00E. 31.10 7.70 Dunlop Fort (Experimental Practice) 5.00-16 3.00D. 26.25 5.00 2.75C. 26.25 4.90 6.25-16 4.50D. 28.80 6.55 4.00D. 28.80 6.30 In the case of the 8.25 section tyre, we are retaining the fitment on a 5.50 rim, as a 6.00 rim as shown on the I.A.E. Data Sheet is not immediately available in this country. | ||
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).