In my previous post, I wrote something like,
「With a straight-pull spoke hub where one side is radial lacing,
you can freely change the phase of the rim's normal/reverse orientation」
but when dealing with rims that have very limited hole offset for specific reasons, that's not possible.
With Mavic's Zicral spoke rims,
for example the Ksyrium with aluminum spokes,
when viewing the rim from the right side in the direction of travel with the valve hole at the bottom,
it looks like the diagram above.
Blue is the freewheel side radial lacing, red is the non-freewheel side tangential lacing,
and the hole offset is in normal orientation.
The tangential lacing side has extremely intense hole offset in the front-to-back direction, so...
↑If you shift the phase, the spoke threads (on the nipple) won't pass through at all.
The non-freewheel side can be built as long as you treat it as normal orientation,
but if you thoughtlessly thread the non-freewheel spokes,
there's a 50/50 chance the freewheel side spokes won't fit through.
With the front wheel (the rear wheel has the same issue in this respect),
there's also extreme hole offset on the left and right sides of the rim, so it can't be built in reverse orientation.
For the front wheel, if the rim hole phase is off by one, it won't build (shift by two and it's back to normal),
for the rear wheel, the radial lacing side has the same condition as the front wheel,
but the tangential lacing side has even more hole offset in the front-to-back direction.
↑This is a Ksyrium rear rim, but
of the rim holes next to the valve, only one has two dots marked on it.
This is the marking that says "this is a rear rim."
This side becomes the freewheel side, but
it's better to thread the non-freewheel side (※) first to avoid mistakes.
※With R-SYS, this becomes the freewheel side. That is, the tangential lacing side.
↑The front rim has one dot.
This is the marking that says "this is a front rim."
Since it's 18H, there's no way to build it as a rear wheel.
「With a straight-pull spoke hub where one side is radial lacing,
you can freely change the phase of the rim's normal/reverse orientation」
but when dealing with rims that have very limited hole offset for specific reasons, that's not possible.
With Mavic's Zicral spoke rims,
for example the Ksyrium with aluminum spokes,
when viewing the rim from the right side in the direction of travel with the valve hole at the bottom,
it looks like the diagram above.
Blue is the freewheel side radial lacing, red is the non-freewheel side tangential lacing,
and the hole offset is in normal orientation.
The tangential lacing side has extremely intense hole offset in the front-to-back direction, so...
↑If you shift the phase, the spoke threads (on the nipple) won't pass through at all.
The non-freewheel side can be built as long as you treat it as normal orientation,
but if you thoughtlessly thread the non-freewheel spokes,
there's a 50/50 chance the freewheel side spokes won't fit through.
With the front wheel (the rear wheel has the same issue in this respect),
there's also extreme hole offset on the left and right sides of the rim, so it can't be built in reverse orientation.
For the front wheel, if the rim hole phase is off by one, it won't build (shift by two and it's back to normal),
for the rear wheel, the radial lacing side has the same condition as the front wheel,
but the tangential lacing side has even more hole offset in the front-to-back direction.
↑This is a Ksyrium rear rim, but
of the rim holes next to the valve, only one has two dots marked on it.
This is the marking that says "this is a rear rim."
This side becomes the freewheel side, but
it's better to thread the non-freewheel side (※) first to avoid mistakes.
※With R-SYS, this becomes the freewheel side. That is, the tangential lacing side.
↑The front rim has one dot.
This is the marking that says "this is a front rim."
Since it's 18H, there's no way to build it as a rear wheel.