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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
  
  


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