This is a continuation from the other day.
I built the front wheel with WTB's i23 ASYM (asymmetric = offset rim).
HB-CX75 28H all-comp reverse Italian lacing.
I'm building the front wheel with an offset rim,
but since the disc hub has rotor offset,
theoretically it works out if I offset the rim holes away from the rotor mounting surface.
You could also think of it as taking the rotor mounting surface as a freewheel body
and building it with 4-6 Italian lacing,
then flipping it upside down.
The images are shot pretty selectively,
but it shows that the closer the rim holes are to directly below the hub center, the less offset there is.
In reality, the rim's offset amount is smaller than the hub's offset amount,
but if the rim holes were directly below the hub center, you shouldn't use asymmetrical lacing patterns.
You can feel while building that the offset rim is working.
Since the offset amount is smaller than on the rear hub,
if you incorporate extreme left-right different-diameter lacing like reverse half-champion or reverse half-strong,
there's a possibility that spoke tension could reverse (the rotor mounting side becoming lower).
Combined with the XT hub 32H front wheel from before, I now have a pair of two front wheels instead of front and rear.
Dimensionally speaking for wheel building, the XT and CX75 hubs could be called the same hub,
but the CX75 comes only in 28H, while the XT comes only in 32H.
With Shimano hubs of this type,
spoke length comes in 4 sizes, but
if the hub, rim, and lacing pattern are the same,
front right and rear left, front left and rear right end up being roughly the same length.
For both front and rear wheels, 6-6 or 4-4 lacing works fine of course,
but with this hub I build the front wheel with 6-4 lacing and the rear with 4-6 lacing,
so front right and rear left use 6-spoke lacing,
and front left and rear right use 4-spoke lacing, which means they're nearly the same length.
Strictly speaking, front right and rear left differ by about 1mm,
but if you prepare spokes in 0.5mm increments, you can share them between wheels.
However, this time the front wheel is 28H,
so the spoke lengths for 4 and 6-lacing differ from the 32H sizes,
resulting in clearly 4 different spoke lengths.
But wait, all this talk assumes the rims are the same.
If the front rim were KOM and rear rim ASYM,
the difference in rim inner diameter meshes nicely and spoke length becomes just 2 types. I discovered.
But in this case, KOM is 32H (rear rim)
and ASYM is 28H (front rim), so I can't benefit from this coincidence.
Damn it!!!
I'd researched this in advance,
so I cut new spokes specifically for the ASYM front wheel.
That's why I could get a photo of having two front wheels.
So the spoke lengths for ASYM and CX75 are
G and H in the diagram above,
but the spoke lengths for the KOM and XT front wheel should be roughly E and F in the diagram,
so I've confirmed they can also be used as F and E for the XT rear hub.
I disassembled the front wheel.
I transplanted the front left straight spoke to the rear right position.
↑straight spoke
I transplanted the front left crossed spoke to the rear right crossed spoke position.
↑crossed spoke
Similarly, I transplanted the front right crossed spoke
to the rear left crossed spoke position.
For JIS lacing, if it's symmetric lacing it would be right-drop, but
since I'm doing 4-6 lacing it's left-drop.
For front right→rear left,
the spoke length differs by about 0.5mm, but I used them as-is.
Looking at the completed wheel, the nipple and spoke end face were flush,
so there are no issues with the length.
Done.
FH-M8000 32H all-comp 4-6 JIS lacing.
The customer requested no spoke wrapping, and it's built with brass nipples.
I built the front wheel with WTB's i23 ASYM (asymmetric = offset rim).
HB-CX75 28H all-comp reverse Italian lacing.
I'm building the front wheel with an offset rim,
but since the disc hub has rotor offset,
theoretically it works out if I offset the rim holes away from the rotor mounting surface.
You could also think of it as taking the rotor mounting surface as a freewheel body
and building it with 4-6 Italian lacing,
then flipping it upside down.
The images are shot pretty selectively,
but it shows that the closer the rim holes are to directly below the hub center, the less offset there is.
In reality, the rim's offset amount is smaller than the hub's offset amount,
but if the rim holes were directly below the hub center, you shouldn't use asymmetrical lacing patterns.
You can feel while building that the offset rim is working.
Since the offset amount is smaller than on the rear hub,
if you incorporate extreme left-right different-diameter lacing like reverse half-champion or reverse half-strong,
there's a possibility that spoke tension could reverse (the rotor mounting side becoming lower).
Combined with the XT hub 32H front wheel from before, I now have a pair of two front wheels instead of front and rear.
Dimensionally speaking for wheel building, the XT and CX75 hubs could be called the same hub,
but the CX75 comes only in 28H, while the XT comes only in 32H.
With Shimano hubs of this type,
spoke length comes in 4 sizes, but
if the hub, rim, and lacing pattern are the same,
front right and rear left, front left and rear right end up being roughly the same length.
For both front and rear wheels, 6-6 or 4-4 lacing works fine of course,
but with this hub I build the front wheel with 6-4 lacing and the rear with 4-6 lacing,
so front right and rear left use 6-spoke lacing,
and front left and rear right use 4-spoke lacing, which means they're nearly the same length.
Strictly speaking, front right and rear left differ by about 1mm,
but if you prepare spokes in 0.5mm increments, you can share them between wheels.
However, this time the front wheel is 28H,
so the spoke lengths for 4 and 6-lacing differ from the 32H sizes,
resulting in clearly 4 different spoke lengths.
But wait, all this talk assumes the rims are the same.
If the front rim were KOM and rear rim ASYM,
the difference in rim inner diameter meshes nicely and spoke length becomes just 2 types. I discovered.
But in this case, KOM is 32H (rear rim)
and ASYM is 28H (front rim), so I can't benefit from this coincidence.
Damn it!!!
I'd researched this in advance,
so I cut new spokes specifically for the ASYM front wheel.
That's why I could get a photo of having two front wheels.
So the spoke lengths for ASYM and CX75 are
G and H in the diagram above,
but the spoke lengths for the KOM and XT front wheel should be roughly E and F in the diagram,
so I've confirmed they can also be used as F and E for the XT rear hub.
I disassembled the front wheel.
I transplanted the front left straight spoke to the rear right position.
↑straight spoke
I transplanted the front left crossed spoke to the rear right crossed spoke position.
↑crossed spoke
Similarly, I transplanted the front right crossed spoke
to the rear left crossed spoke position.
For JIS lacing, if it's symmetric lacing it would be right-drop, but
since I'm doing 4-6 lacing it's left-drop.
For front right→rear left,
the spoke length differs by about 0.5mm, but I used them as-is.
Looking at the completed wheel, the nipple and spoke end face were flush,
so there are no issues with the length.
Done.
FH-M8000 32H all-comp 4-6 JIS lacing.
The customer requested no spoke wrapping, and it's built with brass nipples.