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before you ride:
The following instructions should be read thoroughly before
installation. Improper installation of your Bottom Bracket
may cause an unexpected failure of the parts that could cause
you to lose control of your bicycle resulting in serious injury
or death. We recommend having your parts installed by a qualified
bicycle technician. Crank Brothers assumes no responsibility
for malfunction or injury due to faulty installation.
application:
Cobalt Bottom Brackets are intended for cross country use
and not for downhill. Cyan Bottom Brackets are intended for
Road, but can also be used for cross country riding.
BB compatibility:
Cobalt and Cyan Bottom Bracket have ISIS splines and are only
compatible with any ISIS drive certified cranks. The Bottom
Brackets work with both a 68mm wide frame shell (with the
washer) and with 73mm wide frame shell (without the washer).
M15 crankbolts must be used to secure the crank arms to the
Bottom Bracket.
tools/supplies:
For bottom bracket installation, you need an ISIS socket-type
BB tool, torque wrench, and grease.
parts preparation:
The frame's bottom bracket shell threads should be clean and
undamaged. Have your bottom bracket shell chased and faced
by your bike shop for best results. Check to make sure that
the threads of your Bottom Bracket match the threads in the
bottom bracket shell of your frame.
assembly
Thread the greased BB into the drive side (right side) of
the frame until the flange, or spacer if needed, bottoms against
the frame shell face. NOTE: LEFT HANDED THREAD. Torque as
shown. Push the Seal into place (for Cobalt, only). Cyan Bottom
Brackets do not have this seal.
Thread the greased left adapter cup into the non-drive side
(left side) of the frame. NOTE: RIGHT HANDED THREAD. The left
adapter cup will not bottom against the left face of the frame
shell. Push the Seal into place (for Cobalt, only). Cyan Bottom
Brackets do not have this seal.
crank installation:
Apply grease or titanium anti-seize liberally as shown below
to the spline surfaces of the spindle, the faces of the crank
stops, and to the crankbolt threads in order to prepare the
bottom bracket for crankarm installation. When installing
the crankarms, do not exceed 47 Nm (35 ft-lbf, 484 kgf-cm)
torque when tightening. Consult your crankarm instruction
manual for exact torque specifications.
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