Bearing Buying Guide

This guide covers the basic factors that influence a bearing’s cost and performance so that you can make an informed decision when purchasing your next set. Topics covered on this page include:

• Size
• Rating
• Materials
• Ball Count
• Serviceable vs Sealed

The vast majority of bearings used in skating applications are sized for 8mm axles; these are also known as standard 608 bearings. 7mm (627) bearings are relatively uncommon by comparison, while other sizes such as Micro (688) are only rarely seen. As the only true restriction when it comes to bearings, we recommend buying the size that your axles and wheels are designed to use.

Bearings are most efficient when friction is at its lowest, so materials play a pivotal role in performance. Many bearings are constructed from steel alloys that are tough and affordable. Keep an eye out for components or coatings made from bronze, titanium, and especially ceramic – these will improve a bearing’s resilience, durability, and performance. Ceramic bearings are widely regarded as the best that money can buy.

Many manufacturers seek out an ABEC rating that scores bearings on a scale of 1-9. Higher ABEC scores indicate a more precisely made bearing, however, the system was developed for industrial applications, not skating. Therefore, a number of companies forgo ABEC ratings on their skate bearings and opt for “skate rated” labels that signifies that the bearing was tested and approved for skating.

Skate bearings traditionally have seven balls that provide a good balance of acceleration, top speed, roll, and durability. Six ball bearings use larger balls that generate less friction and roll longer, making them perfect for sustained skating at high speeds (think 27-in-5 or banked track). Eight ball bearings have smaller balls that better withstand side loads, which makes them great for high speed or aggressive turning (think park skating). Derby is a combination of all of those things, so find your magic number!

Serviceable bearings feature removable shields or plastic retainers that allow you to clean and re-lubricate your bearings. Most high-end bearings will be serviceable to allow you to maintain optimal roll and extend the life of the bearing. Sealed bearings have non-removable shields that help keep out harmful debris, but they cannot be cleaned and would have to be replaced when not performing as desired. Sealed bearings are great for those skaters not interested in bearing maintenance but tend to lack the performance offered by serviceable bearings.