Back to wheels today (and so on).
This is a continuation from yesterday.
I managed to build it without any issues.
Filwood fixed gear hub, 20H, black CX-RAY, built with non-drive-side radial spoking.
This hub has an over-locknut dimension of 100mm, so
while it's not impossible to use on a road bike,
mounting the front wheel requires tools (it's not quick-release), so it's for fixed gear use.
This is originally a rear rim, but
when built according to the eyelets' orientation, the left side has a spoke entry angle suited for radial spoking,
and the right side has a spoke entry angle suited for tangential spoking.
Starting with the left side,
Since I'm using radial spoking holes for radial spoking,
there are no holes where the spokes contact the carbon hood.
Moving on to the right side,
Contact is happening in the opposite direction from yesterday.
Yesterday's case was "tangential spoking in radial-spoking-designed holes,"
but today's case is "radial spoking in tangential-spoking-designed holes."
↑Something like this
Separate from this, what I was concerned about was
whether this rear rim might actually be
an offset rim. If the weakness of non-drive-side radial spoking is being mitigated by using an offset rim,
there could be some issues with using it on a front wheel.
The 2005 Cosmic Carbone SL rim, compared to the earlier Cosmic Carbone SSC,
changed from double eyelets to single eyelets,
and added machining between the rim holes for weight reduction.
In a way, it has the same processing as Ksyrium,
and the Ksyrium rear rim is indeed an offset rim.
If the Cosmic Carbone rim were an offset rim,
when building both sides with the same spokes and same construction method,
the spoke tension would differ between left and right.
Since the customer specifically requested radial spoking (←that's what the customer wanted)
I can't fill this gap with different constructions on each side,
and even if I could set one side to 65% spoke weight and the other to 68%,
spoke selection just isn't fine-tuned enough for that.
If it were an offset rim, I could build one side with non-drive-side radial spoking
and the other side with drive-side radial spoking to bring
the effective flange center closer to the rim's offset—but that's
overthinking it and looks terrible.
Even if it would perfectly balance left and right, I'm not doing that.
If this were actually a problem, the dishing on a disc brake front hub
would be far more of an issue.
Following similar logic,
when building a front wheel with a disc brake hub and an offset rim,
you can aim to reduce dishing by offsetting the rim's nipple holes toward the non-rotor side (wheel right side)—
basically the opposite of how you'd offset for the rear wheel.
I once knew a coworker who built 26-inch disc brake front and rear wheels with a Bontrager (Keith Bontrager's brand before it came under Trek)
offset rim and built the front rim with the apex shifted to the left.
He was just blindly memorizing "offset rim apex is shifted left"
without actually understanding the logic—pretty sad guy, I thought.
But then one time he said he was going to make an ultra-thin washer for use on an International Standard disc brake mount,
bought some thin aluminum sheet, and I watched him try to cut out the washer shape first and drill the hole afterward,
rather than drilling the hole first and then cutting around it—at that point
I realized this guy was really out there.
There were already several pieces of aluminum sheet cut into rough circles about 1cm in diameter
lying around, and drilling a 6mm hole precisely in the center of something that small
is extremely difficult.
Anyway, back to whether the Cosmic Carbone rear rim
is an offset rim or not—
I can check.
On the rim's inner side, below the brake zone,
there's a stepped adhesive margin for gluing on the carbon hood.
It's not an offset rim.
The reason the eyelet isn't positioned in the center
is the same standard hole positioning as on a low-profile rim.
You can also visually confirm from the outer circumference whether there's offset (setting aside the hole positioning),
but if you have the chance to look from the inner side, that's more definitive.
This is a continuation from yesterday.
I managed to build it without any issues.
Filwood fixed gear hub, 20H, black CX-RAY, built with non-drive-side radial spoking.
This hub has an over-locknut dimension of 100mm, so
while it's not impossible to use on a road bike,
mounting the front wheel requires tools (it's not quick-release), so it's for fixed gear use.
This is originally a rear rim, but
when built according to the eyelets' orientation, the left side has a spoke entry angle suited for radial spoking,
and the right side has a spoke entry angle suited for tangential spoking.
Starting with the left side,
Since I'm using radial spoking holes for radial spoking,
there are no holes where the spokes contact the carbon hood.
Moving on to the right side,
Contact is happening in the opposite direction from yesterday.
Yesterday's case was "tangential spoking in radial-spoking-designed holes,"
but today's case is "radial spoking in tangential-spoking-designed holes."
↑Something like this
Separate from this, what I was concerned about was
whether this rear rim might actually be
an offset rim. If the weakness of non-drive-side radial spoking is being mitigated by using an offset rim,
there could be some issues with using it on a front wheel.
The 2005 Cosmic Carbone SL rim, compared to the earlier Cosmic Carbone SSC,
changed from double eyelets to single eyelets,
and added machining between the rim holes for weight reduction.
In a way, it has the same processing as Ksyrium,
and the Ksyrium rear rim is indeed an offset rim.
If the Cosmic Carbone rim were an offset rim,
when building both sides with the same spokes and same construction method,
the spoke tension would differ between left and right.
Since the customer specifically requested radial spoking (←that's what the customer wanted)
I can't fill this gap with different constructions on each side,
and even if I could set one side to 65% spoke weight and the other to 68%,
spoke selection just isn't fine-tuned enough for that.
If it were an offset rim, I could build one side with non-drive-side radial spoking
and the other side with drive-side radial spoking to bring
the effective flange center closer to the rim's offset—but that's
overthinking it and looks terrible.
Even if it would perfectly balance left and right, I'm not doing that.
If this were actually a problem, the dishing on a disc brake front hub
would be far more of an issue.
Following similar logic,
when building a front wheel with a disc brake hub and an offset rim,
you can aim to reduce dishing by offsetting the rim's nipple holes toward the non-rotor side (wheel right side)—
basically the opposite of how you'd offset for the rear wheel.
I once knew a coworker who built 26-inch disc brake front and rear wheels with a Bontrager (Keith Bontrager's brand before it came under Trek)
offset rim and built the front rim with the apex shifted to the left.
He was just blindly memorizing "offset rim apex is shifted left"
without actually understanding the logic—pretty sad guy, I thought.
But then one time he said he was going to make an ultra-thin washer for use on an International Standard disc brake mount,
bought some thin aluminum sheet, and I watched him try to cut out the washer shape first and drill the hole afterward,
rather than drilling the hole first and then cutting around it—at that point
I realized this guy was really out there.
There were already several pieces of aluminum sheet cut into rough circles about 1cm in diameter
lying around, and drilling a 6mm hole precisely in the center of something that small
is extremely difficult.
Anyway, back to whether the Cosmic Carbone rear rim
is an offset rim or not—
I can check.
On the rim's inner side, below the brake zone,
there's a stepped adhesive margin for gluing on the carbon hood.
It's not an offset rim.
The reason the eyelet isn't positioned in the center
is the same standard hole positioning as on a low-profile rim.
You can also visually confirm from the outer circumference whether there's offset (setting aside the hole positioning),
but if you have the chance to look from the inner side, that's more definitive.