Originally Posted by Classtime

No such thing as 27 inch tubulars. Your rims are clinchers or 700c tubulars.

Originally Posted by WGB

Sometimes you see tubulars advertised as "27 x 1". I have some in my garage still in boxes, made by Continental. have no idea why that was done. But, as @Classtime points out your rims have to be 700s as no one actually made 27 inch tubular rims.

Originally Posted by 79pmooney

Now, 27", 28" and 700c tubulars all refer to tubulars interchangeable with 700c rims. But I'd bet dollars to donuts (and I believe I have read several times) that actual 27" tubulars were made and used in England to be interchangeable with their standard clinchers. Everything was handmade back then. Making the sewups a touch larger and likewise the rims? No big deal. So, in answer to the question - yes real 27" rims have nearly certainly been made. Just like 41 tooth Campy chainrings have been made. (Been hearing about those vaporware rings for 50 years. A couple of years ago I met someone who told me he had two.) I'll bet if you comb every basement, attic and garage in England you'll find at least a half dozen of those rims and probably a couple of very moldy and rotted sewups. From the 1950s.