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 Dunlop detailing the weights of various rim designs for Bentley and Rolls 25/30 chassis.
| Identifier | ExFiles\Box 157\2\ scan0059 | |
| Date | 26th October 1936 | |
| Gry.{Shadwell Grylls} Please discuss 1332 Rm.{William Robotham - Chief Engineer} DUNLOP RUBBER CO.,LTD. TELEGRAPHIC ADDRESS: "DUNLOPS, PHONE, BIRMINGHAM" YOUR REF: OUR REF: HEP/BMT.941. FORT DUNLOP ERDINGTON BIRMINGHAM TELEPHONE: ERDINGTON 2121 (P.B.X) EXTENSION NO. 395. Messrs. Rolls-Royce Ltd., DERBY. For the attention of W.A.Robotham, Esq. 26th. October, 1936. Dear Sirs, Confirming our discussion at the Show on the question of rim design, and the possible extension of wider rims of lighter gauge on the Bentley and 25/30 chassis, the following information will we hope be of interest for record purposes:- Possible equipment for Bentley Chassis. Average weight of present 3.25x18 rim in 13 gauge (.092) .................. 12 lbs. 8 ozs. Estimated weight of 3.25x18 rim, 14 gauge (.080) ........................ 10 lbs.12 ozs. Average weight of 3.62x18 rim in standard construction, 12 gauge (.104) ......... 15 lbs. 0 ozs. Estimated weight of 3.62x18 rim, 13 gauge (.092) ........................ 13 lbs. 7 ozs. Possible equipment for Rolls 25/30 Chassis. Average weight of 3.62x19 rim, standard construction, 12 gauge (.104) ......... 16 lbs. 0 ozs. Estimated weight of 3.62x19 rim, 13 gauge (.092) ........................ 14 lbs. 5 ozs. Average weight of 4.00x19 rim, standard construction, 12 gauge (.104) ......... 17 lbs. 8 ozs. Estimated weight of 4.00x19 rim, 13 gauge (.092) ........................ 15 lbs. 8 ozs. Cont'd ......... | ||