Another day working on wheels (the rest goes without saying).
A customer brought in both wheels—front and rear—from a Shimano 7900
C35 carbon tubular wheelset.
On the rear wheel,
the braking zone has heat damage
and shows some dishing as well, so
the customer wants to replace it with
an aluminum WO rim for more practical everyday use.
The front wheel doesn't have any particular issues,
but since it wouldn't make sense to rebuild just the rear,
the customer also wants the front wheel switched to an aluminum WO rim.
Today, due to our shop's inventory situation with rims and spokes,
we decided to rebuild the front wheel first.
The rim for the rebuild is
a Campagnolo Eurus front rim with minimal use history—
when laid against a glass surface plate,
it shows no visible runout.
Since the hub flanges use a snap-fit design,
we pre-thread the spokes and nipples through the rim side
and then set the hub in place—that's the method for the preliminary assembly.
This rim uses internal nipples,
and the rim holes have a clear directional orientation.
By the way, the rim height at the raised portion of the rim holes
is exactly 30mm,
but if the Shimano C35 (35mm height) rim had internal nipples
and this Eurus rim had universal nipples,
the length difference from the internal nipples would be
a few millimeters greater than the 5mm rim height difference,
so we could reuse the spokes by trimming them slightly.
In reality it's the opposite, so the spoke length falls short by quite a bit.
Once all spokes and nipples are threaded through every rim hole,
and we pull the spokes toward the wheel center
to level the rim, the directional differences in the rim holes
appear alternately.
And this rim is reversed (backwards).
When viewing the wheel from the side,
the spoke in the next rim hole clockwise from the valve hole
comes from the near-side hub flange from the viewer's perspective.
Got it built.
For the 16-hole spoke count,
I chose black CX Sprint instead of black CX-RAY.
What is this
mysterious wheel marked
Campagnolo Duraace?
The "Duraace" marking on the hub body,
visible when looking through the valve hole,
can't be positioned perfectly nearby because
the relationship between the hub body marking and flange position
is designed for a normal (non-reversed) rim.
If the rim holes had no directional orientation,
with 16 holes we could choose the position relationship between
the valve hole and hub marking in 22.5° increments,
but since there actually is hole orientation,
we can only choose in 45° increments.
If you look at the previous image,
you'll see that the radial line extended from
the Duraace marking on the hub body
points to the space between the rim holes
on one side of the Eurus valve hole position.
A customer brought in both wheels—front and rear—from a Shimano 7900
C35 carbon tubular wheelset.
On the rear wheel,
the braking zone has heat damage
and shows some dishing as well, so
the customer wants to replace it with
an aluminum WO rim for more practical everyday use.
The front wheel doesn't have any particular issues,
but since it wouldn't make sense to rebuild just the rear,
the customer also wants the front wheel switched to an aluminum WO rim.
Today, due to our shop's inventory situation with rims and spokes,
we decided to rebuild the front wheel first.
The rim for the rebuild is
a Campagnolo Eurus front rim with minimal use history—
when laid against a glass surface plate,
it shows no visible runout.
Since the hub flanges use a snap-fit design,
we pre-thread the spokes and nipples through the rim side
and then set the hub in place—that's the method for the preliminary assembly.
This rim uses internal nipples,
and the rim holes have a clear directional orientation.
By the way, the rim height at the raised portion of the rim holes
is exactly 30mm,
but if the Shimano C35 (35mm height) rim had internal nipples
and this Eurus rim had universal nipples,
the length difference from the internal nipples would be
a few millimeters greater than the 5mm rim height difference,
so we could reuse the spokes by trimming them slightly.
In reality it's the opposite, so the spoke length falls short by quite a bit.
Once all spokes and nipples are threaded through every rim hole,
and we pull the spokes toward the wheel center
to level the rim, the directional differences in the rim holes
appear alternately.
And this rim is reversed (backwards).
When viewing the wheel from the side,
the spoke in the next rim hole clockwise from the valve hole
comes from the near-side hub flange from the viewer's perspective.
Got it built.
For the 16-hole spoke count,
I chose black CX Sprint instead of black CX-RAY.
What is this
mysterious wheel marked
Campagnolo Duraace?
The "Duraace" marking on the hub body,
visible when looking through the valve hole,
can't be positioned perfectly nearby because
the relationship between the hub body marking and flange position
is designed for a normal (non-reversed) rim.
If the rim holes had no directional orientation,
with 16 holes we could choose the position relationship between
the valve hole and hub marking in 22.5° increments,
but since there actually is hole orientation,
we can only choose in 45° increments.
If you look at the previous image,
you'll see that the radial line extended from
the Duraace marking on the hub body
points to the space between the rim holes
on one side of the Eurus valve hole position.
Products Mentioned in This Article
* Amazon affiliate links — prices may vary
Original Japanese post: のむラボ日記 #8047