Another wheel day (and so on).
Built a front wheel with a disc brake hub using a Q2 Quasar rim.
The customer left me two rims for front and rear wheels,
but the one I'm using for the front doesn't have a sticker.
I've built a wheel with this rim before
(→here), but the rim diameter appears to be different,
so I couldn't reuse the rim measurement data.
By the way, the data for the Q2 Quasar rim I built back in 2015
is stored in column 3080 of my Excel spreadsheet,
and I entered the data for this rim's build
in column 5141.
Since my computer crashed once and I lost
over 1000 columns of data,
it would definitely have exceeded 6000 columns by now without that loss.
Building known wheels doesn't increase the column count.
Building Nomo Lab wheels doesn't increase it,
and rebuilding Lovells doesn't either.
A hub from a brand called Quanta (クアンタ) that the customer provided
20H all-black Champion reverse Italian lacing
with red aluminum nipples.
When I measured the rim's ETRTO dimension, it came out to 390mm,
so this is an 18-inch WO rim.
Examples where both WO and HE rims exist at the same nominal diameter include
26-inch (WO 590mm / HE 559mm) and
20-inch (WO 451mm / HE 406mm), but
for an 18-inch, an HE rim would have an ETRTO dimension of 355mm.
Since this is a narrow rim, there's no doubt it's a WO rim,
but if it had been a wide rim, I might have mistaken it for an HE rim.
Edit: I thought so, but it turned out to be
an ETRTO 406 20-inch HE rim.
The unusually narrow internal width for an HE rim
caused me to mistake it for a WO rim.
With such a small diameter and rim height of 40mm, the spoke angles are quite steep,
and as shown in the linked article,
I could have used a Wheelsmith SS14,
but this time I built it with DT Champion spokes.
Going back in time, here's the rim as a single piece.
This rim is not an offset rim.
In the image above I'm viewing the valve hole from the outer circumference side, but
the adjacent spoke hole on the outer circumference side is offset toward the bottom of the image.
And in the adjacent one too, it's offset to the same side.
This rim has all its outer circumference holes offset to one side as a design feature.
The inner circumference holes don't so much alternate left and right
as they subtly repeat a pattern of "centered" and "offset to one side"
alternately.
And the offset direction of the inner holes offset to one side is
opposite to the outer circumference holes,
meaning they align nearly on a straight line.
↑Like this
I wrote "tool entry angle,"
but since this isn't a rim with internal nipples,
the offset outer circumference holes
don't actually pose a problem in wheel building.
Essentially, when building a wheel with a hub that has cup shoulders (オチョコ),
you need to orient the direction of the offset outer holes
toward the side where the spoke angle is steeper.
I applied marking tape to the side of the rim where
the spokes have a more relaxed angle,
until the preliminary wheel assembly was finished.
Built a front wheel with a disc brake hub using a Q2 Quasar rim.
The customer left me two rims for front and rear wheels,
but the one I'm using for the front doesn't have a sticker.
I've built a wheel with this rim before
(→here), but the rim diameter appears to be different,
so I couldn't reuse the rim measurement data.
By the way, the data for the Q2 Quasar rim I built back in 2015
is stored in column 3080 of my Excel spreadsheet,
and I entered the data for this rim's build
in column 5141.
Since my computer crashed once and I lost
over 1000 columns of data,
it would definitely have exceeded 6000 columns by now without that loss.
Building known wheels doesn't increase the column count.
Building Nomo Lab wheels doesn't increase it,
and rebuilding Lovells doesn't either.
A hub from a brand called Quanta (クアンタ) that the customer provided
20H all-black Champion reverse Italian lacing
with red aluminum nipples.
When I measured the rim's ETRTO dimension, it came out to 390mm,
so this is an 18-inch WO rim.
Examples where both WO and HE rims exist at the same nominal diameter include
26-inch (WO 590mm / HE 559mm) and
20-inch (WO 451mm / HE 406mm), but
for an 18-inch, an HE rim would have an ETRTO dimension of 355mm.
Since this is a narrow rim, there's no doubt it's a WO rim,
but if it had been a wide rim, I might have mistaken it for an HE rim.
Edit: I thought so, but it turned out to be
an ETRTO 406 20-inch HE rim.
The unusually narrow internal width for an HE rim
caused me to mistake it for a WO rim.
With such a small diameter and rim height of 40mm, the spoke angles are quite steep,
and as shown in the linked article,
I could have used a Wheelsmith SS14,
but this time I built it with DT Champion spokes.
Going back in time, here's the rim as a single piece.
This rim is not an offset rim.
In the image above I'm viewing the valve hole from the outer circumference side, but
the adjacent spoke hole on the outer circumference side is offset toward the bottom of the image.
And in the adjacent one too, it's offset to the same side.
This rim has all its outer circumference holes offset to one side as a design feature.
The inner circumference holes don't so much alternate left and right
as they subtly repeat a pattern of "centered" and "offset to one side"
alternately.
And the offset direction of the inner holes offset to one side is
opposite to the outer circumference holes,
meaning they align nearly on a straight line.
↑Like this
I wrote "tool entry angle,"
but since this isn't a rim with internal nipples,
the offset outer circumference holes
don't actually pose a problem in wheel building.
Essentially, when building a wheel with a hub that has cup shoulders (オチョコ),
you need to orient the direction of the offset outer holes
toward the side where the spoke angle is steeper.
I applied marking tape to the side of the rim where
the spokes have a more relaxed angle,
until the preliminary wheel assembly was finished.