Road Bars (26mm) in a Mountain (25.4mm) Stem = Problem?

Steve Sr. wrote:

Is this small diameter difference likely to cause a problem in real
life? I am trying to put a high angle (130 degree) stem on my road
bike to improve the fit and the high angle stems seem to only
available for Mountain bars.


Possibly maybe yes. With 'faceplate' stems you can often do
that safely but brands/models vary a lot. Maybe link a photo
or try a competent LBS who might give you an opinion after
seeing what stem it is you have.

--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971

Be aware that not all "road" bars measure 26mm at the clamp. If you've
already found a 25.4 stem that you like for fit purposes, you would be
well advised to also look for a set of cyclocross-specific drop bars,
many of which measure 25.4mm. Another good option would be to look for
31.8mm bars and stem, which is the newer oversize standard that is now
being used for both road and mountain bikes. This would allow you to
pair a mountain stem with a drop bar without compromising the clamping
between the two. Whatever you get, make sure it matches.