Getting a bit further into the XLCH project, I have come against an issue which I once knew about but had forgotten - tyres.
The blue XLCH has an original back wheel with a perished, rotten Goodyear All Traction still in place. The question is, what modern tyres (if any) fit this rim?
As far as I can see, the rim is a CM profile rather than the usual WM profile. The Goodyear A-T is long gone (which I don't regard as any great loss) and there are no modern tyres marketed as fitting CM rims. I do have a set of Dunlop K70 originally intended for the Ariel bike, which are the right load rating for an ironhead (64S on the rear) provided they fit the rims.
So far, I've collected one thread from Jockey Journal setting out in a fair amount of detail, why modern tyres shouldn't be used with these rims, plus a thread on the XL Forum which has rather strayed into the predictable "Hell, yeah!" territory. There are the well-known issues from the MoCo about not using them, compromised by their obvious commercial interest. There are modern tyres that post-date these rims.
So, the question is; are any modern tyres rated to be used with the CM rim?