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4 comments
take the rim width (internal)
min tyre size = 1.4x this
max tyre size=2.1x this
so for yer average 15mm rim min= 21mm tyre, max=31.5
in practice you can push it a bit.
as always:
http://sheldonbrown.com/tire-sizing.html
I think you'll find
18c/23c
is either an indication of minimum & maximum tyre sizes suitable (unlikely) - or inner/outer rim width
Take a look here for more info on wheel/tyre sizes
http://www.ctc.org.uk/desktopdefault.aspx?tabid=3802
CORRECTION
the rim size is 700 x 18c/23c
the 700 is the rim size, the 23 is the tyre width.