XD-15 is the ultimate ceramic bearing for your bicycle hubs when nothing but the fastest AND most durable will do. Silicon Nitride balls are 7 times harder than steel, and the XD-15 uses the very best, made in USA Grade 3 Si3N4 balls. XD-15 nitrogen steel alloy has proven it's superior corrosion resistance and longevity in aerospace applications. It's tough, long lasting, and the THE MOST corrosion resistant race material available. ALL OTHER ceramic hybrid bearings are a trade off.

With ENDURO XD-15 you get all three: 1) Speed 2) Longevity 3) Corrosion proof

These are radial bearings which are used in almost all wheel hub applications. They are primarily designed for radial loads: forces at right angles to the wheel hub axle (think up and down forces). Radial bearings can also handle some light axial loading (forces from the side or parallel to the axle). Radial bearings are also referred to as "deep groove ball bearings."

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