tubular 27 = 700c clincher confusion !?

Sorry for the completely stupid question, but Sheldon and the whole interwebs can't enlighten me sufficiently here:

I am thinking about buying a track frame+f for my gf where currently "27x1" **tubulars **(Continental Sonderklasse 175gr 23mm) are mounted. the clearances are very nice and tight right now and I was wondering if it will stay like that if I replace the wheels with normal 700c clinchers? (with 700x23 tyres, or maybe even 700x28)

(as apparently 27" tubulars are not really connected size-wise to 27" clinchers? I'm a bit confused here)

cheers
jetski

...as I also found one comment saying there is no difference in "27x1" and "700" tubulars, that'd be just two names for the same diameter - true or bollocks?

AFAIK there is no such thing as 27" Tubulars.

The wheels you have are almost certainly 700c "Sprints".

You may struggle with clearance on any tyre above 23mm

A 23c clincher will be "taller" in a standard width rim compared to a 23c tub whose cross section when inflated is essentially round.

With a wider rims like a Velocity A23 a clincher would have a lower height (think of an arch with a wider base) but have a wider cross-section.

So depends exactly where the tightness in the clearences is i.e. fork, brake bridge, seat post, chainstays as to whether you'd have a problem.

re. naming convention on tubs, sizing is all identical but you will find them called 27 or 700c.

Got some NOS Conti tubs marked as 27 and went through same "are these different to the new stock marked 700c??" question and they are identical.

^ ok cool, that helps!

Other reason clinchers would be fatter is all the puncture protection and extra tread you don't have on a track tub which is just a thin tread glued on a cotton casing