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).
Blueprint drawing of three different Michelin 'Broadbase' rims.
| Identifier | ExFiles\Box 156\3\ scan0222 | |
| Date | 28th November 1940 guessed | |
| MICHELIN 'BROADBASE' RIMS ALL DIMENSIONS IN MILLIMETRES 'P.7' RIM. 155 x 400 Countersink 1.5 Deep at 45° 'P.8' RIM. 165 x 400 Countersink 1.5 Deep at 45° 'P.10' RIM. 185 x 400 Countersink 1.5 Deep at 45° Notes. DIAMETER 'A' CAN BE VARIED TO SUIT EXISTING PRESSINGS AND IN CONSEQUENCE, THE VALUE DEPRESSION WILL BE MODIFIED. OR, MAY EVEN DISAPPEAR IF THIS DIAMETER IS SUFFICIENTLY SMALL. DIAMETER 'B' MUST IN ALL CASES BE 400 +/- 1 GIVING A CIRCUMFERENCE AT THE TYRE SEAT OF 1257 +/- 3 m/m.{Mr Moon / Mr Moore} DETAIL OF EDGE OF RIM. SCALE = 10/1 MICHELIN TYRE CO. LTD. STOKE-ON-TRENT DRWG. No - U.558 | ||