jonny7

Hello all, I want to put modern bars on a really nice steel bike I have. It has Columbus Thron tubing. I bought a 22.2 quill stem adapter thinking this was the only possible measure for me, but weirdly it seems just a little tight for my frame.

With my digital caliper, I noticed that the previously installed ITM stem had a diameter around 21.75 mm. Has this ever been a weird italian standard? With the help of grease I've managed to fit my new 22.2 (actually ~22.4) adapter into my headtube but it's clearly a little tight in there. It's not swaying left and right when even when the top bolt is loose. Is there any risk with this setup, besides seizing? Like could it put mean extra pressure on the head tube?

Thanks for your help!