Originally Posted by
powerband
I have the same XA Cinelli stem with a 26mm diameter clamp. I also have a Cinelli drop bar with 26 mm diameter. For some reason, I really have to crank down on the stem bolt to tighten onto the 26 mm bar.
I'm concerned that you may have a 26.4mm clamp - there are plenty of shims available to add .4mm to a bar, I'm using some on the 'barhop' build to hold those 25.4 risers in a 26.0 clamp.
If you are certain that you have a 26.0, as long as the bars don't rotate under force, you should be OK. I left out the rubber insert, never could get it to look good.