Somtimes it says

AxBxC

and sometimes

AxB-C

Is this the same thing?

I have started to compile a list of all tire
sizes I come across, and I'm sure I'm the first
dude ever to get this idea. Anyway here is the
result so far:

----------------------------------------------------------------------
ISO / ETRTO England France note
----------------------------------------------------------------------
642 700 original wagon wheel OD
635 700B B = 2nd revision
44-635 28 x 1-5/8 x 1-1/2
634 700B another 700B version
622 700C road bike standard
27 x 1 old British RB standard
27 x 1-1/4 -"-
47-622 700x45C C as in 700C
40-622 28 x 1-5/8 x 1-1/2 700x38C
37-622 28 x 15/8 x 13/8 700x35C
32-622 28 x 14/8 x 10/8
32-622 28 x 1-5/8 x 1-1/4 700x32C
587 700D discontinued in the 80s
26 x 1-3/4 650B original 26 650B
56-584 27.5 x 2.20 650x56B modern 27.5 650B
44-584 26 x 1-5/8 x 1-1/2
40-584 26 x 1-1/2
26 x 1.5 x 2
~50-507? 26 x 2 2 - 19-3/4, trailer
----------------------------------------------------------------------

--
underground experts united
http://user.it.uu.se/~embe8573