Review on Efficient Performance: PGN UCP201 8 Mounted Bearing Aligning Power Transmission Products by Edward Perez

These bearings are much better than I expected for the price. In fact, I almost wondered if they sent me the right order. These bearings are lubricated, made of steel and machined to perfection. After receiving the stem I put the stem in and was amazed at how well they fit. That was precision at its finest. I award these 5 stars without hesitation and now I know where to look for good, stable bearings.