Hey,
Unfortunately I have a flat tire and now have to buy a new one.
The tire shows the size
700 – 42c
and in brackets
( 40 – 622 )
Are these the internal and external dimensions?
Thank you very much in advance!
(1 votes)
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700C is an old French massage and used to describe the outside diameter of racing bike tires. In today’s trekkin grips, however, this size designation is total nonsense because their external diameter is much larger and has no significance anymore, only for reasons of traditon, because some of them still have their head, as well as the designation “28×1.5 inches”.
40-622 is the today standardized size according to ETRTO (https://de.wikipedia.org/wiki/European_Tyre_and_Rim_Technical_organisation), 40 is the width in mm and 622 is the diameter of the wire which is incorporated in the bead.
40 is the width and variable. 622 is the diameter and most important. 28×1.5 is only a kind of generic term for simplification. It could also be 635 in diameter and still considered 28″ inch. 630 even applies 27 1/4
Hi, this table corresponds to the 28 inch
https://www.tomsbikecorner.de/fahrrad-tipps/fahrradreifen-groesse-determine
28 x 1,50 more precisely
when I look at it
the 700 is the old norm and new now are the 622s (I mean initiated by the French and currently probably the common ones)
One is the French, the other is the ETRTO size designation (40-622). With the latter you will surely find your right tire in the bicycle store.