A customer dropped off a Shamal Ultra front wheel with me.
From a crash, about 4 spokes needed replacing,
and the customer had helpfully marked them with tape.
Yeah, those are definitely damaged.
I checked carefully to see if there were any other damaged spokes
beyond the ones marked with tape, and...
This one looks bent.
I loosened the tension.
There's lateral deformation in both directions, so this one needs replacing too.
So that brings us to 5 spokes total.
As I always say,
"Don't touch any other nipples until the largest lateral runout
is no longer directly under the nipple of the replaced spoke."
If there's no rim deformation, that alone will have fixed most of it.
This time too, adjusting only the 5 nipples where I replaced spokes
eliminated almost all the lateral runout, and in that state
we can consider it pretty much restored to just before the crash happened.
But there was one noticeable radial runout.
On a rear wheel, you'd have radial runout from the G3 lacing structure,
but on a front wheel with evenly spaced rim holes, this is something that should be corrected.
Since I was working in front of the customer, I explained it,
but this runout didn't come from the 5 spoke replacement job.
At one particular phase the rim is deflected outward and hits the truing stand gauge,
while at all other phases there's even clearance—
but the characteristic pale brake wear marks
show almost no vertical runout, which tells us something.
As you can see in the photos above,
the distance between the wear marks and the gauge remains constant
regardless of the rim's radial runout.
↑That's what I mean.
Then, when I dial out the radial runout...
The distance between the rim profile and the gauge becomes consistent at every phase,
and the brake wear marks jump around within the brake zone.
I had the customer confirm this as well.
I've written about similar situations several times before,
but this is probably the first time I've illustrated it.
This time I had a particularly clear wear mark band to show the concept,
so I went into more detail.
Fixed.
As for the cause of the radial runout—I doubt that amount of radial runout
would pass the factory standards for a Shamal Ultra off the shelf,
so I suspect it came from an unconscious simple lateral truing job
done later without attention to radial runout.
↑The replaced spokes
From a crash, about 4 spokes needed replacing,
and the customer had helpfully marked them with tape.
Yeah, those are definitely damaged.
I checked carefully to see if there were any other damaged spokes
beyond the ones marked with tape, and...
This one looks bent.
I loosened the tension.
There's lateral deformation in both directions, so this one needs replacing too.
So that brings us to 5 spokes total.
As I always say,
"Don't touch any other nipples until the largest lateral runout
is no longer directly under the nipple of the replaced spoke."
If there's no rim deformation, that alone will have fixed most of it.
This time too, adjusting only the 5 nipples where I replaced spokes
eliminated almost all the lateral runout, and in that state
we can consider it pretty much restored to just before the crash happened.
But there was one noticeable radial runout.
On a rear wheel, you'd have radial runout from the G3 lacing structure,
but on a front wheel with evenly spaced rim holes, this is something that should be corrected.
Since I was working in front of the customer, I explained it,
but this runout didn't come from the 5 spoke replacement job.
At one particular phase the rim is deflected outward and hits the truing stand gauge,
while at all other phases there's even clearance—
but the characteristic pale brake wear marks
show almost no vertical runout, which tells us something.
As you can see in the photos above,
the distance between the wear marks and the gauge remains constant
regardless of the rim's radial runout.
↑That's what I mean.
Then, when I dial out the radial runout...
The distance between the rim profile and the gauge becomes consistent at every phase,
and the brake wear marks jump around within the brake zone.
I had the customer confirm this as well.
I've written about similar situations several times before,
but this is probably the first time I've illustrated it.
This time I had a particularly clear wear mark band to show the concept,
so I went into more detail.
Fixed.
As for the cause of the radial runout—I doubt that amount of radial runout
would pass the factory standards for a Shamal Ultra off the shelf,
so I suspect it came from an unconscious simple lateral truing job
done later without attention to radial runout.
↑The replaced spokes