I bought this in conjunction with the Factory Connection preload ring kit for my 2000 YZ 250. This is a very easy product to install and works great. It makes a noticeable difference in the performance of the rear shock and also makes preload adjustments easier. The only minor quibble is that the Factory Connection preload ring required a few thousandths to be machined off of the spring flange's outer diameter in order to fit inside this bearing set. This may not be necessary with all fitments on other bikes though. A great product that has a noticeable effect at a great price!!