🚲 CYSKY Seatpost Adapter Shim - Bicycle Seatpost Tube Adapter for Mountain Bike, Road Bike, MTB, BMX, Fixie Gear - 25.4/27.2/30.8/31.6/33.9/34.9 Sizes Review

Exactly what I ordered and expected. The product arrived early. The material feels and looks solid. It's quite heavy and was easy to install.

I was converting an old electric bike from Sweden and getting a seat post that works was a challenge. I found this gasket and the problem is solved

Worked great. I made sure to measure the bike seat post and post hole with a caliper to determine sizing (which I would definitely recommend).

I received 3 bikes with different seatpost sizes. I want to share a saddle with suspension. The saddle was $150 and I don't want to buy 3. This little thing solved my problem.

Adapter appears to be a quality piece with a small gap that provides the clamping action. It fits right into the bike tube, flush with the clamp, and the seat post fits perfectly into the adapter. Well done.

Requires Seatpost Adapter Gasket. You will probably measure more than twice the diameter of the seat post and seat post tube. Perfect fit :) Will update if it fails, but unlikely as rider is under 100lbs and not off-roading.

Worked great to allow me to convert my daughter's racing class BMX seat to a longer post with an adjustable seat. Now she is the perfect size and couldn't be happier. It's very well made, I don't think it's going to break any time soon, and it was well worth the few bucks I spent.

Installs easily in seconds as you would expect and works great on my grandson's bike. I was a little unsure if my measurements were accurate, even with a digital micrometer, but apparently they were accurate. I have to wonder if the negative comments were measured correctly and/or the seatpost or frame mounting hole was a bit off from industry standards. However, they don't mention if a competitor's product worked better for them, so the question is whether this product was the wrong solution…