-
It’s a possibility so worth checking. I had a cannondale that the previous owner had been using with a 30.9mm post. Having bought one myself, it was slipping. Realised it had been over tightened. I had to prize it open a bit because it wasn’t having any of the 31.6mm post I had. Worked eventually though and no more slipping, didn’t have to force it in after I’d spread the opening...
will do.
what I can say is when the bolt is tightened the metal of the lug is very close together. not sure how normal that is though. 27.0 does seem a very snug fit though.