Wheels Manufacturing Seatpost Shim

Worked perfectly for me. My '97 Bianchi Boardwalk has a 26.6 mm seat post, so when i bought a ThudBuster to smooth out the ride, had to go with 25.2 mm version. My seat clamp would not grip the smaller diameter tightly enough to prevent turning and slipping down during riding. I really hoped for a shim just like this, and was thrilled to find it! Having read all the reviews, i picked the 26.2 to 25.4mm just to be safe. Works perfectly and seems quite true to size. Not sure what the issues are with other reviewers, but my experience is very positive and I do truely appreciate a company that takes thentime to make such a niche but important part available. FWIW I own and used some very high quality digital calipers to measure my old seat post so I knew exactly what I had and what I needed.

Did the job to allow me to fit a seat into a post of a different size. Before buying, make sure you do all your measurements carefully

Not what it says it was not even close!

Like I said, it's a piece of metal, formed to go between the seat post and seat tube, it doesn't get much simpler than this.