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TREK SERVICE INFORMATION August 2016
Crank Is Rubbing Or There Is Excessive Drag
If you notice that the crank arms rotate poorly, there are several possible issues.
Cause
Solution
Out of spec or bent non-drive metal seal
• The inside chamfer of the metal seal (Figure 14.40)
rubs on the outer race of the bearing.
• The metal seal deforms under the compressive load
of the non-drive arm and rubs on the outer race of the
bearing.
Install a new metal seal (same Part
Number: 282865). We have revised the
metal seal by adding a ring of material,
0.3 mm thick, to the seal around the inner
diameter. This will move the outer edge of
the seal away from the bearing.
Bearing not seated properly
• The axle shield might not be seated completely in the
frame (Figure 14.41) causing the flange of the shield to
foul the bearing.
• A tight bore can cause the installer to think the bearing
is seated when it is not.
Make sure the halves of the axle shield
are snapped together, and then remove
and reinstall the bearing. When properly
installed the bearing will not sit even with
bottom bracket shell.
•Enduro bearing: 0.75 mm inside the shell.
•GXP non-drive bearing: 0.25 mm outside
the shell
Figure 14.40. SRAM bearing set
Metal seal
Figure 14.41. Inserting one half of the axle shield into
frame
