- Inner Diameter
- Matching Race/Cup
Bearings are important for matching up your axle spindles and hubs needed. Know your bearing sizes before ordering any replacement hubs/drums to make sure it will work. Most bearings come with an industry standard part number (44649, 15123, etc.) engraved onto it. If it is worn and not able to be recognized, measuring the diameter of the I.D. (inner dimension) will get you the information needed.