Another day with wheels (and so on).
A customer brought in the rear wheel of a first-generation Racing Zero.
Strictly speaking, the original generation has
rim/spoke/hub all in red/red/red,
but this one came out after that with black/red/black coloring
and the specs are identical to the original except for the color.
↑This image doesn't convey it well, but
when you spin the wheel, the rim is like a potato chip,
wobbling heavily side to side.
It's beyond the point where truing can fix it,
so the rim needs replacing, but the rims for the first-generation Racing Zero and
Racing 1 have already been discontinued.
Maybe because the Racing 1 debuted earlier,
spare part rims were discontinued
earlier than the Racing Zero too, but
if you replace the nipples along with the rim,
you could repair it with a Racing Zero rim—a workaround
I've used multiple times before.
Now that the rims for the first-generation Racing Zero (even-spaced rim holes)
have also been discontinued, that trick won't work anymore.
However, the customer brought in a used
rim of the same type that was in relatively decent condition.
When placed against a glass surface plate, it's only very slightly warped,
but it's workable enough to build a wheel.
When I align the two rims at their seam positions,
there's a gap like this on the opposite side.
Just to be clear, it's the wheel's rim that's bent.
When looking at the wheel from the right side,
if I look at the two rim holes going counterclockwise from the valve hole,
the raised portion created by machining
is independent for each rim hole, but
for the two rim holes going clockwise from the valve hole,
the unmachined portion connects and runs together.
The Racing Zero rear wheel is 21H (odd number), so
opposite the valve hole is not the midpoint between rim holes
but an actual rim hole.
And you can't position the rim seam at a phase where there's a rim hole.
So the center of this unmachined portion
becomes the phase opposite the rim seam.
Built it.
Placed the original rim on the floor.
Zoomed in on the gap from that position—looks like this.
I didn't hold down the opposite side of the rim for the shot.
Just sitting there on its own, it's warped like a potato chip to this degree.
A customer brought in the rear wheel of a first-generation Racing Zero.
Strictly speaking, the original generation has
rim/spoke/hub all in red/red/red,
but this one came out after that with black/red/black coloring
and the specs are identical to the original except for the color.
↑This image doesn't convey it well, but
when you spin the wheel, the rim is like a potato chip,
wobbling heavily side to side.
It's beyond the point where truing can fix it,
so the rim needs replacing, but the rims for the first-generation Racing Zero and
Racing 1 have already been discontinued.
Maybe because the Racing 1 debuted earlier,
spare part rims were discontinued
earlier than the Racing Zero too, but
if you replace the nipples along with the rim,
you could repair it with a Racing Zero rim—a workaround
I've used multiple times before.
Now that the rims for the first-generation Racing Zero (even-spaced rim holes)
have also been discontinued, that trick won't work anymore.
However, the customer brought in a used
rim of the same type that was in relatively decent condition.
When placed against a glass surface plate, it's only very slightly warped,
but it's workable enough to build a wheel.
When I align the two rims at their seam positions,
there's a gap like this on the opposite side.
Just to be clear, it's the wheel's rim that's bent.
When looking at the wheel from the right side,
if I look at the two rim holes going counterclockwise from the valve hole,
the raised portion created by machining
is independent for each rim hole, but
for the two rim holes going clockwise from the valve hole,
the unmachined portion connects and runs together.
The Racing Zero rear wheel is 21H (odd number), so
opposite the valve hole is not the midpoint between rim holes
but an actual rim hole.
And you can't position the rim seam at a phase where there's a rim hole.
So the center of this unmachined portion
becomes the phase opposite the rim seam.
Built it.
Placed the original rim on the floor.
Zoomed in on the gap from that position—looks like this.
I didn't hold down the opposite side of the rim for the shot.
Just sitting there on its own, it's warped like a potato chip to this degree.