A customer brought in a Zonda rear wheel for me to work on.
There's severe radial runout in one spot, and it's immediately obvious when you put it on a fixed roller stand.
G3-built rear wheels have radial runout inherent to their spoke lacing pattern,
but it's smaller than the deformation of the tire contact patch, so normally you can't feel it.
I asked the customer if there was a history of truing this wheel,
and they said "no," but apparently there is a history of spoke replacement.
Well, there it is. Some hack definitely touched it.
In the image above, I put marking tape near the rim joint on the opposite side of the valve hole,
and only this "rest phase not directly under G3" is deflecting outward more than the other six positions.
They did manage to true the lateral runout.
The replaced spoke is original equipment,
it's the one spoke on the anti-freewheel side near the Z in ZONDA in the image above.
I could tell because it has a slightly different color and finish.
Plus, the rim is shifted toward the anti-freewheel side.
From here on, the truing stand gauge position is the same in all photos.
Rest phase
Directly under G3
I'm photographing the spots where the difference is particularly large,
so these are close to the maximum rather than the factory average.
Loose rest phase
It's rubbing solidly against the gauge.
The cause is the G3 position near the Z in ZONDA closest to it,
which is deflecting outward compared to the other six G3 positions.
When the rear wheel came in, the radial runout was visible even without the truing stand—
you could see the rim bounce at a certain phase.
From there, in front of the customer, I worked out the radial runout and
showed them the center is true with no lateral runout.
I'd love to write which shop's amateur did this,
but I agreed not to name them, so I can't.
It's a multi-location chain,
but I didn't ask which branch it was.
By the way, it wasn't Silvest Cycle.
Those guys couldn't have gotten it into this condition in the first place.
There's severe radial runout in one spot, and it's immediately obvious when you put it on a fixed roller stand.
G3-built rear wheels have radial runout inherent to their spoke lacing pattern,
but it's smaller than the deformation of the tire contact patch, so normally you can't feel it.
I asked the customer if there was a history of truing this wheel,
and they said "no," but apparently there is a history of spoke replacement.
Well, there it is. Some hack definitely touched it.
In the image above, I put marking tape near the rim joint on the opposite side of the valve hole,
and only this "rest phase not directly under G3" is deflecting outward more than the other six positions.
They did manage to true the lateral runout.
The replaced spoke is original equipment,
it's the one spoke on the anti-freewheel side near the Z in ZONDA in the image above.
I could tell because it has a slightly different color and finish.
Plus, the rim is shifted toward the anti-freewheel side.
From here on, the truing stand gauge position is the same in all photos.
Rest phase
Directly under G3
I'm photographing the spots where the difference is particularly large,
so these are close to the maximum rather than the factory average.
Loose rest phase
It's rubbing solidly against the gauge.
The cause is the G3 position near the Z in ZONDA closest to it,
which is deflecting outward compared to the other six G3 positions.
When the rear wheel came in, the radial runout was visible even without the truing stand—
you could see the rim bounce at a certain phase.
From there, in front of the customer, I worked out the radial runout and
showed them the center is true with no lateral runout.
I'd love to write which shop's amateur did this,
but I agreed not to name them, so I can't.
It's a multi-location chain,
but I didn't ask which branch it was.
Those guys couldn't have gotten it into this condition in the first place.