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2 comments
650 x 23 means 650mm (rim) diameter x 23mm tyre width.
700 x 25 means 700mm (rim) diameter x 25mm tyre width (this is the "standard" road size now).
The Venzo tubes you mention are for 700x18 to 25mm tyre width, so they will only be suitable for one of your bikes.
The other will require 650x23 tubes.
Hope this helps!
Got it. Thanks!