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Steel bearings to fit BB30, BBright and SI bottom brackets.
Special 6 Months Guarantee: All MonocromeTM bearings carry a special guarantee with a 6 month no questions asked replacement.
ABEC Grades: an ABEC code indicates the grade a bearing is made to. Bearings with higher ABEC grade numbers have tighter manufacturing tolerances for running at higher speeds and a higher cost. ABEC1 is the lowest grade, ABEC9 is the highest. The bearings in this kit are ABEC3.
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