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