Originally Posted by
JBerman
How can I tell? It says 19mm in the specs for rim width, assuming that is external so not sure what internal is.
EDIT: It's usually on some label or engraved somewhere on the wheel itself. ymmv. You can try eyeballing it.. if the 19mm is the
INTERNAL width, an inflated 23mm tire would probably only be a little wider than the rim at the braking surface.
Alternatively, get out a ruler.
From sheldon brown's site.. you want to measure the inner rim width in millimeters
