Another day working on wheels (etc.).
A customer brought in the rear wheel of a Nomu Lab Wheel No. 5 for repair.
During riding, the derailleur hanger suddenly snapped off,
the rear derailleur got sucked into the rear wheel,
and bent the spokes.
After replacing the two bent spokes and truing,
there was a strange wobble I couldn't get rid of in another area.
There was a spot where I had to loosen the nipple to correct lateral runout,
but correcting just that lateral runout caused vertical runout to appear
and the tension became locally low.
...I figured the rim was probably warped, so
I disassembled the wheel.
Since I wasn't 100% certain whether the rim was warped,
I didn't swap it out right away.
When I checked it against a glass surface plate,
sure enough, the rim was warped.
I don't know exactly what happened,
but it looked like the rim had been subjected to a downward stomping force
while the wheel was lying on its side.
To replace the two spokes on the freewheel side,
it was faster to remove the entire freebody with sprockets attached
rather than remove the sprockets from the freebody alone,
so I installed a different right end from the same hub.
Even with this setup, I can do lateral and vertical truing.
Since the position of the right end's face—which serves as the reference for wheel center—
isn't accurate without the freebody,
I'll need to reinstall the freebody and re-center before final assembly.
This right end has a flange-like shape, but
because of that, I couldn't pull the right end out without removing the lockring.
The image above shows the freebody with sprockets attached,
removed from the wheel.
Got it assembled.
The freewheel side spokes I replaced
weren't in consecutive positions.
↑Replaced spokes
But since the derailleur hit almost the same spot,
they were deformed in almost the same way.
However, they weren't bent cleanly just once from the same location—
Looking closely, they were deformed in quite a complex, dented way.
A customer brought in the rear wheel of a Nomu Lab Wheel No. 5 for repair.
During riding, the derailleur hanger suddenly snapped off,
the rear derailleur got sucked into the rear wheel,
and bent the spokes.
After replacing the two bent spokes and truing,
there was a strange wobble I couldn't get rid of in another area.
There was a spot where I had to loosen the nipple to correct lateral runout,
but correcting just that lateral runout caused vertical runout to appear
and the tension became locally low.
...I figured the rim was probably warped, so
I disassembled the wheel.
Since I wasn't 100% certain whether the rim was warped,
I didn't swap it out right away.
When I checked it against a glass surface plate,
sure enough, the rim was warped.
I don't know exactly what happened,
but it looked like the rim had been subjected to a downward stomping force
while the wheel was lying on its side.
To replace the two spokes on the freewheel side,
it was faster to remove the entire freebody with sprockets attached
rather than remove the sprockets from the freebody alone,
so I installed a different right end from the same hub.
Even with this setup, I can do lateral and vertical truing.
Since the position of the right end's face—which serves as the reference for wheel center—
isn't accurate without the freebody,
I'll need to reinstall the freebody and re-center before final assembly.
This right end has a flange-like shape, but
because of that, I couldn't pull the right end out without removing the lockring.
The image above shows the freebody with sprockets attached,
removed from the wheel.
Got it assembled.
The freewheel side spokes I replaced
weren't in consecutive positions.
↑Replaced spokes
But since the derailleur hit almost the same spot,
they were deformed in almost the same way.
However, they weren't bent cleanly just once from the same location—
Looking closely, they were deformed in quite a complex, dented way.