Another day of wheel building (and so on).
I built a rear wheel using the tubular rim from the WH-7801-C and
the hub from the WH-R9100-C24.
20H black Champion straight gauge / black CX sprint straight gauge
Built with forced left-right 2-cross lacing.
On the original wheel, the final crosses weren't woven on either side,
but on this wheel I wove them on both sides.
The non-drive side will be tied off later.
This is a Shimano low-profile carbon tubular rim wheel, but
while the 7801 and 7850 series have this capability,
the 7900 series doesn't (strictly speaking, "it's designed that way"),
and on the revived 9000 series the rear wheel is an OptaValve 21H
so when building with this 20H rim, you need a rear hub with 10H on each side.
Since the 7900 hub doesn't support 11-speed, if 11-speed conversion is also a requirement,
it must be either the 9000 C24 CL or TL, or the R9100 C24 hub
(even the 9000 C24 tubular model is OptaValve 21H).
The R9100 C24 model name is just "WH-R9100-C24" without
-CL, -TL, or -TU suffixes at the end.
Since it comes only in clincher models, there's no need to distinguish between them anymore.
I wonder why they discontinued the tubeless model? (playing dumb)
There's brake shoe residue burnt onto the braking surface,
whether it was causing uneven braking is unclear,
but the areas where it was adhering showed varying density.
I inspected the braking surface to check for deformation (surface irregularities) due to heat damage,
and so far found absolutely no problems,
but if I continue using it as-is, during downhill braking
the phase where the shoe residue is attached might heat up and deform, so
I removed it all with acetone.
I built a rear wheel using the tubular rim from the WH-7801-C and
the hub from the WH-R9100-C24.
20H black Champion straight gauge / black CX sprint straight gauge
Built with forced left-right 2-cross lacing.
On the original wheel, the final crosses weren't woven on either side,
but on this wheel I wove them on both sides.
The non-drive side will be tied off later.
This is a Shimano low-profile carbon tubular rim wheel, but
while the 7801 and 7850 series have this capability,
the 7900 series doesn't (strictly speaking, "it's designed that way"),
and on the revived 9000 series the rear wheel is an OptaValve 21H
so when building with this 20H rim, you need a rear hub with 10H on each side.
Since the 7900 hub doesn't support 11-speed, if 11-speed conversion is also a requirement,
it must be either the 9000 C24 CL or TL, or the R9100 C24 hub
(even the 9000 C24 tubular model is OptaValve 21H).
The R9100 C24 model name is just "WH-R9100-C24" without
-CL, -TL, or -TU suffixes at the end.
Since it comes only in clincher models, there's no need to distinguish between them anymore.
I wonder why they discontinued the tubeless model? (playing dumb)
There's brake shoe residue burnt onto the braking surface,
whether it was causing uneven braking is unclear,
but the areas where it was adhering showed varying density.
I inspected the braking surface to check for deformation (surface irregularities) due to heat damage,
and so far found absolutely no problems,
but if I continue using it as-is, during downhill braking
the phase where the shoe residue is attached might heat up and deform, so
I removed it all with acetone.