Spur sprockets do not come with bearings, and we recommend replacing the bearing for every 2 spur sprocket replacements. Most of the time going from a 7 tooth to an 8 tooth sprocket is no better or worse when using a standard chain. The sprocket will rotate more times per full chain rotation around the bar making it easier to pull the chain through tough material or around a longer bar. If you've go a rim sprocket setup on the saw it would be cheap to try out both and decide for yourself. .cardIcon-icon[data-test="credit-card-icon-jcb"] { display:none !important;} For heavy users who wear them out on a regular basis, this is a plus. imagelinks[2]="https://woodmizer.com/us/Sawmill-Blades?utm_source=forestryforum.com&utm_medium=banner&utm_campaign=sawmillblades&utm_term=2022-05-01&utm_content=800x160" //-->,