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).
Inaccuracies, weight, and aesthetics of Michelin disc wheels compared to other types.
| Identifier | Morton\M11\ img234 | |
| Date | 1st September 1919 | |
| To EH. from R.{Sir Henry Royce} Copy to CJ. " " BN.{W.O. Bentley / Mr Barrington} " " DA.{Bernard Day - Chassis Design} " " C. " " RN.{Mr Robinson} " " HN.{F. C. Honeyman - Retail orders} ORIGINAL RECEIVED 1919 R1/G30/9/19. (3) RE MICHELIN DISC WHEELS. X.3482 X.682 I am astounded to hear that the holes in the Michelin wheels are inaccurate to the extent of .100". I quite agree with you not upsetting 1 EX. with anything but adopted standard parts, and suggest therefore fitting the Michelin wheels to another chassis such as 7 CA, or preferably something with un-satisfactory present arrangement. ✓ I consider you ought not to be too particular about the accuracy of spacing because Michelin wheels have been running for many years very satisfactorily, for instance, all Lancia belonging to the navy. ✓2451 In comparing the weight, it would appear that our details for the Michelin wheels are unnecessarily heavy, 9% difference in the actual wheel amounting to 3.3 lbs is not much, especially as it should have permitted some weight saving on the hub. It would also be necessary, to make a fair comparison, to include the double disc covers and their fixings, as arranged on 49 GB. ✓ While discussing this subject, I strongly object to the Rudge-Whitworth pattern of cover, because it stands out such a long way beyond the tyre, and secondly, it appears to be down-right ugly. The sketch hereunder shews the dimensions and the danger of forgetting these projections exist. I am always anxious in passing another vehicle or shunting, that this 3½" projection may catch a similar projection on a passing car. (Contd.) R R 532v (200 M) (2-D 408 80-4-19) B&T S[unclear] | ||