Review on Donepart 608 2RS Bearings Skateboards Scooters by Andrew Cramer

They are very smooth but don't swing freely when you twist them, they stop as soon as you release them. There is also very little kickback. Out of 30 there was only one that had a damaged rubber ring but it still rotated normally. Also very quiet, I have used them on a mini bike stretcher and they are very quiet when spinning very fast. I have no idea how fast. They are also pre-lubricated.