Review on F**KG 6200 ZZ 10x30x9mm Pre-Lubricated Bearing by Tommy Russo

These are good quality bearings. I have a lot of experience with different bearings and types. You will often find that bearings of this size can have a large gap between the inner and outer ring. They have a tight tolerance, useful in most applications, and they last longer. I like the quality very much. As long as it's not too tight, like an interference fit on the outer ring. This causes the bearing to bind due to the close tolerance and pressure on the balls. As long as it's non-slip or snug, you'll be happy.