This support article will discuss a brief measuring procedure which will help you to identify the correct bearings for our 2010 and newer Mountain Bike Hubs. For info on Gravel hubs scroll to the bottom of this article.
If your hubs are pre 2010 models and you are unsure of bearing specs please reach out to our support team with a few images; we would be happy to review.
The vast majority of our MTB hubs will use 6805 cartridge bearings. However, there were several production runs of hubs which utilized either 6804 or 6803 cartridge bearings. The best way to identify which you need is to measure the OD (Outside Diameter) of the bearing or bearing bore in the hub shell.
A hub using 6805 bearings will measure 37mm OD:
A hub using 6804 bearings will measure 32mm OD:
A hub using 6803 bearings will measure 26mm OD:
2021 - Current XCX Gravel front hubs
All XCX Gravel front hubs use 6902 bearings
2024 - Current Piedmont front hubs
All Piedmont Front Hubs use 6803 bearings