I built a front wheel with a Shimano PRO RC50 rim.
This is a rim from a complete wheel built with 6600 Ultegra front and rear 24H hubs,
but one got ruined due to heat warping,
so the customer wanted me to build a front wheel with the surviving rim.
Evolite hub 24H, CX-RAY Italian 4:1 lacing.
The tangent lacing is what the customer requested.
By the way, this rim has its spoke holes drilled the opposite way from most rims in the world—
what I call a "reverse rim" on this blog.
Moreover, the hole drilling is tight, and even when trying to orient the spokes opposite to the hole drilling direction,
the spokes threaded through the nipples won't go beyond directly under the rim.
Some rims with slight hole drilling can be built in reverse or
with 2:1 lacing to partially work against the hole drilling,
but this one is impossible.
Naturally, I felt a strong sense of wrongness during initial truing, so
I switched the spokes I was threading from left-pull to right-pull and built it Italian style.
This isn't my first time building with an RC50 rim,
but I don't remember it being reverse-drilled then, so I looked it up (→here).
I found out that WO rims are drilled correctly.
(If you look carefully at the pre-rebuild image at that link, it's correctly drilled)
When it comes to generic off-the-shelf rims with reverse drilling, Kolima comes to mind,
and this RC50 rim's cosmetic carbon looks very similar to Kolima.
However, looking at the shape of the outer edge and the finish inside the rim,
there's no way this is Kolima.
The price alone rules out Kolima anyway.
This is a rim from a complete wheel built with 6600 Ultegra front and rear 24H hubs,
but one got ruined due to heat warping,
so the customer wanted me to build a front wheel with the surviving rim.
Evolite hub 24H, CX-RAY Italian 4:1 lacing.
The tangent lacing is what the customer requested.
By the way, this rim has its spoke holes drilled the opposite way from most rims in the world—
what I call a "reverse rim" on this blog.
Moreover, the hole drilling is tight, and even when trying to orient the spokes opposite to the hole drilling direction,
the spokes threaded through the nipples won't go beyond directly under the rim.
Some rims with slight hole drilling can be built in reverse or
with 2:1 lacing to partially work against the hole drilling,
but this one is impossible.
Naturally, I felt a strong sense of wrongness during initial truing, so
I switched the spokes I was threading from left-pull to right-pull and built it Italian style.
This isn't my first time building with an RC50 rim,
but I don't remember it being reverse-drilled then, so I looked it up (→here).
I found out that WO rims are drilled correctly.
(If you look carefully at the pre-rebuild image at that link, it's correctly drilled)
When it comes to generic off-the-shelf rims with reverse drilling, Kolima comes to mind,
and this RC50 rim's cosmetic carbon looks very similar to Kolima.
However, looking at the shape of the outer edge and the finish inside the rim,
there's no way this is Kolima.
The price alone rules out Kolima anyway.