I'm planning to build a wheel soon using a hub from the EQUAL brand by Grota-tack,
and when I checked the history of my spoke length calculation formulas,
the hub I used previously was model number HBF-X101-J24,
and this time's hub is X102, so the model number has progressed.
When I checked the dimensions on the manufacturer's website,
it seems the dimensions haven't changed.
Regarding flange width, the measurement point on the flange side
is at the center of the flange section.
So the left and right flange widths are
from hub center to flange center.
However, when I take actual measurements of flange width,
I measure to the outside edge of the flange.
This isn't a matter of which is "correct."
Shimano's published dimensions are, like mine, to the outer edge of the flange,
and with TNI hubs, you'll find a mix of both
outer edge measurements and center measurements,
but this is because the manufacturing source differs
even within the same brand.
The published value for flange hole diameter was
49mm on the right and 44mm on the left for the front hub.
For flange hole diameter,
there's only one possible interpretation for what we're measuring:
"hole center to center,"
but when I look at my calculation formula history,
I have right 24.25mm and left 21.75mm.
Since my formula uses radius for calculations,
converting to diameter gives me right 48.5mm and left 43.5mm.
Let me check if the right flange hole diameter
really is 49mm.
When I place the calipers' measuring point at the center of one hole,
this is what I get on the other side.
Similarly, I also measured the left flange hole diameter of 44mm.
I'm not claiming my 48.5mm measurement
is off by even 0.1mm,
but at least it's definitely
more accurate than calling it 49mm.
With this front hub, when I do 4-cross lacing,
the left and right spoke lengths on a disc front wheel
would typically differ by about 1.5mm,
but I can build it with almost identical lengths, shared left-right,
which is something I consider completely irrelevant,
hence why it has this inverted flange arrangement that goes against
the logic of a better wheel.
The reason I say it's irrelevant is because
since I do different-diameter cross lacing anyway,
I won't be ordering or preparing just one spoke type,
and when doing 6-cross lacing, reducing
about 14mm difference down to 12mm is pointless anyway.
When doing 4-cross lacing,
yes, it's true you can use the same length for both sides,
but when doing 2-cross lacing,
you can't use the same length for both sides.
Calculating with my measured values,
for 6-cross lacing on the rim I'm planning to use with this front hub,
the spoke length difference between left and right comes to 1.52mm.
If I calculate using the manufacturer's published hub dimensions
of 49/44mm flanges
and left-right flange widths (center to center),
it comes to 1.48mm.
So the claim about "the same length left and right" applies only
to 4-cross lacing.
As far as I know, the only manufacturer whose hub dimension specifications
are trustworthy is Shimano,
and for rim inner diameter specs (which also have interpretation differences),
only Mavic is trustworthy.
Everything else requires actual measurement.
Honestly, untrustworthy specs shouldn't be published in the first place
By the way, for the front wheel I'm planning to build with this front hub,
when doing 4-cross lacing,
the spoke length difference between left and right is
0.30mm with my measured values,
and 0.26mm with the manufacturer's specs,
but what matters isn't having a small left-right difference—
it's the accuracy of the individual left and right
spoke lengths calculated,
and I'm confident that the values based on my measurements
are more accurate than those based on the manufacturer's published specs.
Though honestly, I don't do 4-cross lacing anyway.
and when I checked the history of my spoke length calculation formulas,
the hub I used previously was model number HBF-X101-J24,
and this time's hub is X102, so the model number has progressed.
When I checked the dimensions on the manufacturer's website,
it seems the dimensions haven't changed.
Regarding flange width, the measurement point on the flange side
is at the center of the flange section.
So the left and right flange widths are
from hub center to flange center.
However, when I take actual measurements of flange width,
I measure to the outside edge of the flange.
This isn't a matter of which is "correct."
Shimano's published dimensions are, like mine, to the outer edge of the flange,
and with TNI hubs, you'll find a mix of both
outer edge measurements and center measurements,
but this is because the manufacturing source differs
even within the same brand.
The published value for flange hole diameter was
49mm on the right and 44mm on the left for the front hub.
For flange hole diameter,
there's only one possible interpretation for what we're measuring:
"hole center to center,"
but when I look at my calculation formula history,
I have right 24.25mm and left 21.75mm.
Since my formula uses radius for calculations,
converting to diameter gives me right 48.5mm and left 43.5mm.
Let me check if the right flange hole diameter
really is 49mm.
When I place the calipers' measuring point at the center of one hole,
this is what I get on the other side.
Similarly, I also measured the left flange hole diameter of 44mm.
I'm not claiming my 48.5mm measurement
is off by even 0.1mm,
but at least it's definitely
more accurate than calling it 49mm.
With this front hub, when I do 4-cross lacing,
the left and right spoke lengths on a disc front wheel
would typically differ by about 1.5mm,
but I can build it with almost identical lengths, shared left-right,
which is something I consider completely irrelevant,
hence why it has this inverted flange arrangement that goes against
the logic of a better wheel.
The reason I say it's irrelevant is because
since I do different-diameter cross lacing anyway,
I won't be ordering or preparing just one spoke type,
and when doing 6-cross lacing, reducing
about 14mm difference down to 12mm is pointless anyway.
When doing 4-cross lacing,
yes, it's true you can use the same length for both sides,
but when doing 2-cross lacing,
you can't use the same length for both sides.
Calculating with my measured values,
for 6-cross lacing on the rim I'm planning to use with this front hub,
the spoke length difference between left and right comes to 1.52mm.
If I calculate using the manufacturer's published hub dimensions
of 49/44mm flanges
and left-right flange widths (center to center),
it comes to 1.48mm.
So the claim about "the same length left and right" applies only
to 4-cross lacing.
As far as I know, the only manufacturer whose hub dimension specifications
are trustworthy is Shimano,
and for rim inner diameter specs (which also have interpretation differences),
only Mavic is trustworthy.
Everything else requires actual measurement.
By the way, for the front wheel I'm planning to build with this front hub,
when doing 4-cross lacing,
the spoke length difference between left and right is
0.30mm with my measured values,
and 0.26mm with the manufacturer's specs,
but what matters isn't having a small left-right difference—
it's the accuracy of the individual left and right
spoke lengths calculated,
and I'm confident that the values based on my measurements
are more accurate than those based on the manufacturer's published specs.
Though honestly, I don't do 4-cross lacing anyway.