aucun Universal Bike SEATPOST Reducer 27.2 > 30MM Shim Extension Convert Tube Adapter Adaptor Cycle Vintage MTB Fixie SINGLESPEED Spacer Aluminium SEAT Post Saddle

The shim diameters are perfect but the overall length could be longer to provide support for the full length of the seatpost. Using it to fit a dropper post in my frame but i had to make my own shim to support the bottom of the post.

It work well, noiseless