XD-15 is the ultimate ceramic hybrid bearing. When nothing but the fastest, most durable, AND most corrosion-proof will do, XD-15 High Nitrogen Steel, paired with Silicon Nitride balls can't be beat. The Grade 3 made-in-USA ceramic ball bearings are 7 times harder than steel. 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.

Fitting a 30mm spindle into a "BB92" ("BB86" in road applications) shell does not leave much room for the bearings--a challenge that has limited the use of BB30 cranks in such applications. By making outer race of these bearings into the "cup" and adding a second row of ball bearings, previous limitations have been overcome. The result is a strong, smooth, and corrosion resistant bottom bracket.

Please note that this adapter bottom bracket is designed for use with BB92 (mountain) and BB86 (road) bottom bracket shells with a press-fit ID of 41mm. Due to the width of these respective bottom brackets, you must use a BB30 crankset with a long enough spindle. In road applications, this means a BB386EVO crank or equivalent. For MTB applications, Race Face Next SL (or other Race Face "Cinch" crank sets), e13 MTB, and Rotor 3D+ crank are among those cranks that are compatible. Most SRAM BB30 cranks are NOT compatible, although some longer-spindled SRAM 30mm spindled cranks can be found.