CYSKY Bike SeatPost Adapter Shim, 25.4/27.2/28.6/30.4/30.8/31.6/33.9/34.9mm, 60mm Length Bicycle Seat Post Tube Adapter, Seatpost Reducing Sleeve Shim for Mountain Bike, Road Bike, MTB, BMX

Impecable

Smooth as butter

Installed easily in seconds just as one would expect and is working fine on my grandson's bike. I was a little unsure if my measurements were accurate, even using a digital micrometer, but apparently they were. I have to wonder if the negative commenters were measuring accurately and/or if their seat post or frame mounting hole were slightly off from industry standards. Either way, they don't mention if a competitor's product worked better for them, so one has to wonder if this product was the wrong solution for their fitment issues.

Great product works perfect

Fit perfectly and worked to keep yhe seat in place!

This is exactly as described. It feels heavy to me.

a little heavy to hold--but magnifies as described

Fit perfectly and good quality