XD642SB-B12 is a boost spec hub with
a 12mm*148mm axle which can NOT be changed to any other
uses the new X4 freehub which has 6
asymetric pawls which gives a 3 degree Angle of Engagement
and 120 Points of Engagement.
you fast and secure engagement under any conditions.
from BDop Cycling comes standard with Japanese EZO bearings.
can be ordered with SHIMANO 10/11 or