Alan had no input with the regs, he freely admitted that "I don't know one end of a sidecar from another and, frankly, they terrify me!".
The regs as introduced were formulated with no specific machine in mind but from many of that period, from memory, photos and good old fashioned talking to people. As for tyres and wheel sizes there were obviously 16" and larger and the only permissible other sizes was either 12" for the sidecar wheel which used a Dunlop 12" Sidecar Racing Tyre or 10" (mini) wheels with a maximum rim size of 4 1/2 J. Most common rubber was either Dunlop Green Spots or Avon Grand Prix. Slicks were banned as were cut slicks.
Ray was using correct rim sizes, his outfit had a valid Eeligibility Certificate, but he had inadvertently fitted a marginally oversized rear tyre, to correct this about one eight of an inch was removed from either shoulder.
There are invariably problems of one kind or another with ultra competitve drivers/passengers and occasionally a protest may have been lodgeds, s ometimes successful, sometimes not. I am not going any further on this tack as much of it is water under the bridge and will benefit nobody.!
In retrospect one reg that could/should have been included is that "gentlemanly conduct is expected at all times
Should the unlikelihood happen that the odd forum member or two wishes to discuss this topic privately then please PM me.
It is true about the sidecar family - you can stop racing but you can never, ever leave!