David Martin said:The thing to look for is the ETRO number.
I think there should be another letter in there... ETRTO?
ISO size is the same thing.
Quoted message said:This is the bead seat
diameter, ie the size of the rim the tyre fits on and the width of the
tyre, and looks like 622-25 (622mm diameter rim and 25mm cross section
tyre, broadly equivalent to the 27 x1" but not quite the same.) Here is
an abbreviated list of sizesETRO traditional description
635 28" Policemans bike
630 old 27" road
Well, not *that* old... it's post-WW2 (there was a pre-war 27 x 1-1/4;
that's ETRTO 622!)
Quoted message said:622 700c (also known as 29" for off road)
597 Another 26"
That's 26 x 1-1/4
Quoted message said:590 Old 26" roadster
26 x 1-3/8 or 650A
Quoted message said:584 650B
26 x 1-1/2 in UK
Quoted message said:571 650c
26 x 1-3/4 (ie: trade bike size)
Quoted message said:559 26" mountain bike
and it's round about here that my memory fails
Quoted message said:547 24"
541 600A
540 24"
520 24"
507 24"
501 22"
490 550A
451 many 20" folding bikes
440 500A
438 Dutch 20"
406 20" BMX
400 18"
390 450A
387 Dutch 18"
369 17" Moulton
355 Another 18" size
349 16"
340 400A
305 16"
298 14"
254 14"
222 11"
203 12 1/2"
--
Andrew