Another day of wheelbuilding (and so on...).
A customer entrusted me with two Campagnolo Barcelona 92 rims.
These are Olympic host city and year series rims,
and since they're the successor to the Greek letter series "Sigma,"
they're a flagship model.
Later on, there were silver rims based on Nuelion rims modified with eyelet specifications
to have standard spoke hole counts. The WO rim version is called Montreal 76,
while the tubular rim version is called Barcelona 92,
but they're completely different products.
↑This one here, for reference
It's amazing that unused examples of this rim have survived until now...
It says SWT (Side Wall Treatment).
A Shimano C24 front wheel is light with soft, low-height rim characteristics, but has 16 holes,
so it has to be tensioned quite high.
As a result, the spoke holes are pulled alternately left and right,
and you can observe a phenomenon where the rim snakes around
when you look at lateral deflection in the brake zone.
This phenomenon occurred even with old low-height rims
(which is also a retronym, the opposite of deep rim).
With hard-anodized surface-treated rims,
in a moderately worn state, the rim sidewalls develop a regular wear pattern
like the grain pattern on a Japanese sword blade,
and in that condition, the brakes grip really well.
This is my own Araya ADX-5, but
the rim sidewall is worn a bit past the "moderate" point.
Ideally, next to the spoke holes, the anodize should alternately
be present and absent,
but depending on the phase, the wear pattern next to consecutive spoke holes
looks the same—it's worn that far.
Even so, it definitely grips—kkiit!—better than a brand new rim.
It seems the customer wanted to achieve this kind of grip right from the start,
and that's what the SWT processing on this Barcelona 92 accomplishes.
It's like the original version of brake zone machining.
The hub is the final generation Record that I have on deposit, but
at the customer's request, I've CULT-converted it.
I was planning to build the rear wheel with the lighter rim,
but they weighed the same on a 1-gram resolution scale.
Just so you know, the two images above are not of the same rim.
Looking closely, the rim in the lower image has
its sticker positioned closer to the valve hole.
It's spot-the-difference level stuff.
The reason the Campagnolo logo is reflected in the scale is
because of the factory-built wheel box.
All built.
Black Record hub, 32 holes, built with Competition/Race pattern
Rainbow sequence (VAS pattern) nipples.
I'll do the true-up work later.
When I say the spokes are "Competition/Race," that's not because I used
DT's Competition Race spokes (DT Comp Race spokes), but rather
because the freewheel side uses DT Competition and the opposite side uses Sapim Race.
Both are 2.0-1.8-2.0mm round butted spokes—
I lined up Competition and Race side by side.
The image on top is Competition.
You might ask, "Lined up how?", but
I lined them up roughly at the butted sections.
The Competition has the 2.0mm sections longer at both ends,
while the Race's are shorter, so even though they're the same nominal size,
these spokes differ in specific gravity by about 1.5%.
I used Race on the non-freewheel side because
the currently available longest Competition length wasn't long enough.
It's a length that wholesalers used to stock.
It's technically a different-side-diameter build, but as a precaution,
if the situation ever arose where I had to reverse this
and use Competition on the non-freewheel side because that's what I usually use,
I've planned to use Competition on both sides to avoid a reverse different-diameter configuration.
A customer entrusted me with two Campagnolo Barcelona 92 rims.
These are Olympic host city and year series rims,
and since they're the successor to the Greek letter series "Sigma,"
they're a flagship model.
Later on, there were silver rims based on Nuelion rims modified with eyelet specifications
to have standard spoke hole counts. The WO rim version is called Montreal 76,
while the tubular rim version is called Barcelona 92,
but they're completely different products.
↑This one here, for reference
It's amazing that unused examples of this rim have survived until now...
It says SWT (Side Wall Treatment).
A Shimano C24 front wheel is light with soft, low-height rim characteristics, but has 16 holes,
so it has to be tensioned quite high.
As a result, the spoke holes are pulled alternately left and right,
and you can observe a phenomenon where the rim snakes around
when you look at lateral deflection in the brake zone.
This phenomenon occurred even with old low-height rims
(which is also a retronym, the opposite of deep rim).
With hard-anodized surface-treated rims,
in a moderately worn state, the rim sidewalls develop a regular wear pattern
like the grain pattern on a Japanese sword blade,
and in that condition, the brakes grip really well.
This is my own Araya ADX-5, but
the rim sidewall is worn a bit past the "moderate" point.
Ideally, next to the spoke holes, the anodize should alternately
be present and absent,
but depending on the phase, the wear pattern next to consecutive spoke holes
looks the same—it's worn that far.
Even so, it definitely grips—kkiit!—better than a brand new rim.
It seems the customer wanted to achieve this kind of grip right from the start,
and that's what the SWT processing on this Barcelona 92 accomplishes.
It's like the original version of brake zone machining.
The hub is the final generation Record that I have on deposit, but
at the customer's request, I've CULT-converted it.
I was planning to build the rear wheel with the lighter rim,
but they weighed the same on a 1-gram resolution scale.
Just so you know, the two images above are not of the same rim.
Looking closely, the rim in the lower image has
its sticker positioned closer to the valve hole.
It's spot-the-difference level stuff.
The reason the Campagnolo logo is reflected in the scale is
because of the factory-built wheel box.
All built.
Black Record hub, 32 holes, built with Competition/Race pattern
Rainbow sequence (VAS pattern) nipples.
I'll do the true-up work later.
When I say the spokes are "Competition/Race," that's not because I used
DT's Competition Race spokes (DT Comp Race spokes), but rather
because the freewheel side uses DT Competition and the opposite side uses Sapim Race.
Both are 2.0-1.8-2.0mm round butted spokes—
I lined up Competition and Race side by side.
The image on top is Competition.
You might ask, "Lined up how?", but
I lined them up roughly at the butted sections.
The Competition has the 2.0mm sections longer at both ends,
while the Race's are shorter, so even though they're the same nominal size,
these spokes differ in specific gravity by about 1.5%.
I used Race on the non-freewheel side because
the currently available longest Competition length wasn't long enough.
It's a length that wholesalers used to stock.
It's technically a different-side-diameter build, but as a precaution,
if the situation ever arose where I had to reverse this
and use Competition on the non-freewheel side because that's what I usually use,
I've planned to use Competition on both sides to avoid a reverse different-diameter configuration.