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).
Cross-section drawing of an E.W.B 5 wire wheel with a well-base rim, fitted with a Dunlop balloon tyre for a 40/50 HP Phantom.
| Identifier | ExFiles\Box 53\3\ Scan101 | |
| Date | 26th October 1926 | |
| G 75355 APPROX. 1.000 SMALLER DIA, SAME WIDTH, .500 NARROWER TRACK. YELLOW LINES GIVE APPROX. OUTLINE - MICHELIN. 17x50. "CONFORT BIBENDUM". SECTION OF E.W.B 5 WIRE WHEEL WITH WELL-BASE RIM 5" x 21" DIA. FITTED WITH DUNLOP BALLOON TYRE 6.75" x 33" DIA. 40/50 H.{Arthur M. Hanbury - Head Complaints} P. PHANTOM N SCH 2094 REPLACE ALL COPIES OF THIS TRACING IN THE FOLLOWING DEPTS. DRAWN BY A.E.H DATE 26.10.'26 USED ON: 40/50, 40/50, 40/50 SECTION: 6170, 7040, 7420 SCALE - 1/1 Handwritten: B.J/S.S. 25-11-27 DIMENSIONS OF TYRE TAKEN FROM DUNLOP PRINT D.D.L. 1636. INFLATED SIZES SHOWN. DIMENSIONS OF RIM SECTION TAKEN FROM DUNLOP PRINT R.S. 0237. THE EFFECTIVE RUNNING RADIUS IS BASED ON THE RATE GIVEN ON DUNLOP PRINT D.D.L. 1636 (i.e. 1.380 FOR 15 CWTS - TYRE INFLATED TO 36 LBS/SQ.IN) & A CAR HAVING A BODY OF AVERAGE WEIGHT & LOAD DISTRIBUTION, CARRYING A NORMAL NUMBER OF PASSENGERS, SPARES, ETC. (i.e. 1450 LBS FRONT & 1775 LBS REAR ON EACH TYRE). FOR DIMENSIONS OF SHELL SEE DRG. G 74774 SHELL TYPE E.B. EFFECTIVE RUNNING RAD AT REAR = 16.040 EFFECTIVE RUNNING RAD AT FRONT = 16.310 13 S.W.G. (.093) | ||