I replaced the spokes on a Shamal Ultra yesterday, and
at that time the customer told me "there's radial runout that won't come out."
With G3 wheels, the part where 3 spokes are pulled together gets deformed inward,
while the other sections bow outward.
The Shamal Ultra has G3 lacing with 7 pairs making 21 spokes total,
but regarding radial runout, the rim becomes "something between a regular heptagon and a circle."
So the radial runout on G3 wheels isn't abnormal — it's structural specification.
The rim's deflection amount is less than the tire's contact patch deformation,
so you practically never feel the radial runout when riding.
Since tire roundness isn't perfect either, there's absorption from that too.
Well, what I'm getting at is that even though the spoke hole pattern goes "right, right, left,"
the old Fulcrum wheels with evenly-spaced nipples can dial in radial runout
to a higher degree than the current models.
Radial and lateral runout were almost non-existent, but the rear wheel's center was off.
Based on the lack of runout and the condition of the nipples,
I think the center was off from the start.
I re-centered it properly, but that wheel is now
like "a ruler with the center transferred backwards from the centering gauge."
This job is actually part of an overhaul,
and the frame this wheel will go on is a custom frame from a certain builder.
The rear triangle's center and the newly-centered rear wheel's center
lined up perfectly with not a single hair's breadth of deviation.
（I didn't measure it precisely, but visually there's no misalignment.）
It feels great when the work comes together like that.
Completely unrelated, but long ago there was a wheel at another builder's place
that was being used as a "jig for center checking,"
and I shamelesslycommandeered borrowed it.
I only really wanted the Mavic Oro 7 rim on that wheel. Sorry about that.
I also cleaned the inside of the hub.
I cleaned the sprocket too.
at that time the customer told me "there's radial runout that won't come out."
With G3 wheels, the part where 3 spokes are pulled together gets deformed inward,
while the other sections bow outward.
The Shamal Ultra has G3 lacing with 7 pairs making 21 spokes total,
but regarding radial runout, the rim becomes "something between a regular heptagon and a circle."
So the radial runout on G3 wheels isn't abnormal — it's structural specification.
The rim's deflection amount is less than the tire's contact patch deformation,
so you practically never feel the radial runout when riding.
Since tire roundness isn't perfect either, there's absorption from that too.
Well, what I'm getting at is that even though the spoke hole pattern goes "right, right, left,"
the old Fulcrum wheels with evenly-spaced nipples can dial in radial runout
to a higher degree than the current models.
Radial and lateral runout were almost non-existent, but the rear wheel's center was off.
Based on the lack of runout and the condition of the nipples,
I think the center was off from the start.
I re-centered it properly, but that wheel is now
like "a ruler with the center transferred backwards from the centering gauge."
This job is actually part of an overhaul,
and the frame this wheel will go on is a custom frame from a certain builder.
The rear triangle's center and the newly-centered rear wheel's center
lined up perfectly with not a single hair's breadth of deviation.
（I didn't measure it precisely, but visually there's no misalignment.）
It feels great when the work comes together like that.
Completely unrelated, but long ago there was a wheel at another builder's place
that was being used as a "jig for center checking,"
and I shamelessly
I only really wanted the Mavic Oro 7 rim on that wheel. Sorry about that.
I also cleaned the inside of the hub.
I cleaned the sprocket too.