A customer brought in a WH-R9100, essentially a C35 WO rim model wheel for inspection.
They wanted the hub and rim trueness checked.
Let's start with the front wheel.
It's not brand new and shows some signs of use,
but nothing that suggests damage inside the hub from heavy use.
I checked both front and rear hubs and found no issues.
I added just a little bit of grease.
↑This is the temporary center reference before work, and it wasn't off-center.
There was a slight amount of runout that I corrected,
but it wasn't significant enough to shift the wheel center, and after the work it remains perfectly centered.
Next, the rear wheel.
There was center offset toward the freewheel side, unrelated to age and use.
There was also runout, so I tried to eliminate the center offset by tightening the non-freewheel side with weighted truing,
but honestly that amount of offset was too much, and after finishing the runout correction,
about half the original offset remained, so
I fixed that separately.
This wheel is labeled as a C40 model,
but the WO rim spec is essentially identical to the older 9000 series C35
aside from cosmetic differences on the rim and hub.
The stated rim width is 20.8mm, and rim height is 35mm.
Actual measurement shows the rim just below the spoke hole is 35.6mm,
and the corresponding position in between measures 32.7mm.
The tubular spec has a stated rim width of 28mm, which is quite wide and modern-looking,
with rim height of 37mm—and even that clearly falls short of 40mm.
The WH-R9100 WO models in C24 and C40 show up occasionally,
but I've never actually seen the tubular model in person
outside of trade shows.
Does it really even exist...?
They wanted the hub and rim trueness checked.
Let's start with the front wheel.
It's not brand new and shows some signs of use,
but nothing that suggests damage inside the hub from heavy use.
I checked both front and rear hubs and found no issues.
I added just a little bit of grease.
↑This is the temporary center reference before work, and it wasn't off-center.
There was a slight amount of runout that I corrected,
but it wasn't significant enough to shift the wheel center, and after the work it remains perfectly centered.
Next, the rear wheel.
There was center offset toward the freewheel side, unrelated to age and use.
There was also runout, so I tried to eliminate the center offset by tightening the non-freewheel side with weighted truing,
but honestly that amount of offset was too much, and after finishing the runout correction,
about half the original offset remained, so
I fixed that separately.
This wheel is labeled as a C40 model,
but the WO rim spec is essentially identical to the older 9000 series C35
aside from cosmetic differences on the rim and hub.
The stated rim width is 20.8mm, and rim height is 35mm.
Actual measurement shows the rim just below the spoke hole is 35.6mm,
and the corresponding position in between measures 32.7mm.
The tubular spec has a stated rim width of 28mm, which is quite wide and modern-looking,
with rim height of 37mm—and even that clearly falls short of 40mm.
The WH-R9100 WO models in C24 and C40 show up occasionally,
but I've never actually seen the tubular model in person
outside of trade shows.