U.S.E posts were only supplied in 25.0mm for a while and you used a shin to make them fit your frame. I searched ebay earlier though and there's plenty posts available down to 25.0mm.
I just wondered if anyone had experience of issues from using such shimmed posts.
Is fitting a 25.0mm post and 27.2mm shim a legit alternative to reaming my slightly corroded/tight seatube to allow me to put my seat up and down?