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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 spline and are only compatible with any ISIS drive certified cranks. The Bottom Brackets works with both a 68mm wide frame shell (with the washer) and with 73mm wide frame shell (without the washer). M15 crank bolts 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 crank bolt threads in order to prepare the bottom bracket for crank arm installation. When installing the crank arms, do not exceed 47 Nm (35 ft-lbf, 484 kgf-cm) torque when tightening. Consult your crank arm instruction manual for exact torque specifications.
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