A customer (technically speaking) didn't bring in their Shamal Ultra because the rotation seemed off—they rode it in.

↑Here's the culprit


The bearings on the freebody were damaged, at least on the outer side.
When I grabbed the freebody with the sprocket attached by hand,
it moved with a rattling motion.
I couldn't get a good shot to place two images side by side,
but the eccentricity of the movement was clear enough
to see the distance between the endnut and the lockring spline changing.
The metal dust around the endnut is
from the bearing internals being ground away.


Beyond that, things were looking bad.
The three pawls on the freebody were nearly flat,
with only one barely still engaged.


The pawl return spring had snapped clean in two.
The spring has a projection that fits into a hole in the freebody
to prevent it from slipping during operation—
if we think of the freebody like a clock face with 12 o'clock at the top,
the spring extends just over a full circle, ending around 1 o'clock.
When this spring breaks, the fracture point is consistently around 6 o'clock.


The bearings were from an older era when there was no seal on the inner-facing side.
The spare parts have since switched to double-sealed versions.
The outer bearing on the freebody was definitely shot,
but the inner one was pretty rough too, so I replaced both.


I replaced the pawl return spring.


I cleaned all the parts involved in the work.
I checked everything and found just a slight lateral wobble—
no center deviation.
Not recently, but this is a wheel that has inspection history with our shop.