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).
Technical drawing detailing the section of a 4.00-inch rim, including dimensions for standard and racing variants.
| Identifier | ExFiles\Box 159\3\ scan0088 | |
| Date | 5th January 1937 | |
| MODIFICATIONS A) MOD. N° 3486 RE-DRAIN HOLES ALT° TO SUIT DES. SHT C.257 FROM C190. 18-4-37 B/L B) .510/.520 FROM .5" SEE DES SHT C.331 MOD N° 5746 22-9-37 Y/B C) .510 ALT° TO .504" / .520 ALT° TO .514" MOD N° 6086 27-10-37 Y/B D) MOD N° 7038 1/32" CH. @ 45° 1/64R ADDED VALVE HOLE TOOLS MODIFIED 11-4-38 B/L RACING RIMS TABLE: A (+.030, -.000), B (±.005) INCH/M/M 18.083 / 56.81 / 1443 19.083 / 59.95 / 1522.6 20.083 / 63.09 / 1602.5 21.083 / 66.23 / 1682.2 STD RIMS TABLE: A' (+.000, -.030), B' (+.000, -.034), C, D', INCH/M/M 18.063 / 56.747 / 1441.37 | 16.408 / 51.54 / 1309.2 19.063 / 59.89 / 1521.2 | 17.408 / 54.69 / 1389.1 20.063 / 63.03 / 1601 | 18.408 / 57.83 / 1468.8 21.063 / 66.171 / 1680.67 | 19.408 / 60.97 / 1548.6 17.063 / 53.604 / 1361.4 | 15.408 / 48.404 / 1229.4 'A' DIA +.030 -.000 STD RIMS 'B' CIRC +.000 -.034 'C' DIA MEAN FOR DISC 'D' CIRC WHEEL RIMS ONLY 5/32 DIA DRAIN HOLES SEE NOTE BELOW DETAIL OF VALVE HOLE .656 DIA OF FLAT DRAIN HOLES ALL WHEELS - 2 OPPOSITE VALVE HOLE (EXCEPT XR846) SPOKED & PLAIN DISC - WHEN BONDERISED TO MATL: M.S. 12 S.W.G (.104") WIDTH 9 15/16" HAVE 4 HOLES - 2 ADJACENT AND 2 OPPOSITE VALVE HOLE (D) SCALE:- 1/4 TITLE:- DETAIL OF 4.00 RIM SECTION ISSUE N° 1 MODIFICATION SUPERSEDING RSO412 A.M. APR DATE DIMENSIONS NOT LIMITED ARE SUBJECT TO A TOLERANCE OF ±.005' DUNLOP RIM & WHEEL CO. LTD. FOLESHILL, COVENTRY DRG N° RSO548 | ||