I received a front wheel from a Kシリウム 125 (Ksilium 125 wheel set) from a customer.
Just the front wheel.
I saw the rear wheel before (→here).
Regarding that rear wheel, the clearance between the tire and the seat stay is
clearly different on the left and right sides,
so there's "suspicion that the center has drifted despite me setting it perfectly the other day"
and the customer wanted me to check it again.
I removed the tire and took a look, and the center was actually perfectly aligned.
The clearance between the tire and the right side of the seat stay is clearly narrower than on the left side,
but the clearance with the chain stay is the same on both sides (or at least I can't tell the difference visually).
If the difference in clearance on the left and right sides of the seat stay stems from the rear wheel's center misalignment,
then flipping the rear wheel around and installing it backwards should reverse the difference in clearance.
But it didn't reverse.
(It resulted in "equal clearance" as shown in the diagram above)
Depending on conditions, there are rear wheels where the center shifts when about 7 bar of pressure is applied,
but to my knowledge, this doesn't happen with R-SYS series wheels,
and even if it did, it would be only a very slight amount.
It's rather sad that a rear wheel—essentially a ruler reproduced in reverse mirror with rim center gauge precision—
reveals the frame's misalignment.
However, if the center of the rear wheel is positioned directly behind the center of the front triangle,
then there's no frame centerline deviation,
and it seems the issue is just that the left and right sides of the seat stay are curved differently.
I haven't thoroughly investigated this, so I can't be certain.
What I can say for sure is that the rear brake hole wasn't positioned directly above the center of the centered rim,
and the misalignment was obvious enough to notice at a glance.
Oh, I haven't even written about the front wheel yet.
There was a very slight center misalignment,
but since the tension was slack anyway, I tightened it.
As I've persistently written before, this isn't an over-tensioning modification—
it's simply bringing an individual that was clearly built with low tension up to the average and proper value.
This ソーヨー (Soyo) latex tube is light enough that you can tell just by picking it up.
However, it breathes so heavily that about 4 bar leaks out per day, apparently.
Just the front wheel.
I saw the rear wheel before (→here).
Regarding that rear wheel, the clearance between the tire and the seat stay is
clearly different on the left and right sides,
so there's "suspicion that the center has drifted despite me setting it perfectly the other day"
and the customer wanted me to check it again.
I removed the tire and took a look, and the center was actually perfectly aligned.
The clearance between the tire and the right side of the seat stay is clearly narrower than on the left side,
but the clearance with the chain stay is the same on both sides (or at least I can't tell the difference visually).
If the difference in clearance on the left and right sides of the seat stay stems from the rear wheel's center misalignment,
then flipping the rear wheel around and installing it backwards should reverse the difference in clearance.
But it didn't reverse.
(It resulted in "equal clearance" as shown in the diagram above)
Depending on conditions, there are rear wheels where the center shifts when about 7 bar of pressure is applied,
but to my knowledge, this doesn't happen with R-SYS series wheels,
and even if it did, it would be only a very slight amount.
It's rather sad that a rear wheel—essentially a ruler reproduced in reverse mirror with rim center gauge precision—
reveals the frame's misalignment.
However, if the center of the rear wheel is positioned directly behind the center of the front triangle,
then there's no frame centerline deviation,
and it seems the issue is just that the left and right sides of the seat stay are curved differently.
I haven't thoroughly investigated this, so I can't be certain.
What I can say for sure is that the rear brake hole wasn't positioned directly above the center of the centered rim,
and the misalignment was obvious enough to notice at a glance.
Oh, I haven't even written about the front wheel yet.
There was a very slight center misalignment,
but since the tension was slack anyway, I tightened it.
As I've persistently written before, this isn't an over-tensioning modification—
it's simply bringing an individual that was clearly built with low tension up to the average and proper value.
This ソーヨー (Soyo) latex tube is light enough that you can tell just by picking it up.
However, it breathes so heavily that about 4 bar leaks out per day, apparently.