Another day of wheel work (and so on).
Following yesterday's rear wheel,
I'm rebuilding the front wheel of the 303 Firecrest.
ZIPP ZR1 disc hub, 24H
All-black CX Sprint, 4-cross reverse Italian lacing.
If the spokes after rebuilding weren't silver,
I might have reused the black CX Sprint.
It wasn't as bad as the rear wheel,
but the spokes were also laying on one side,
and the right side spokes (on the non-rotor-mount side)
showed significant deformation.
The large difference in spoke tension between left and right
might also be related to
the right side hub flange being wider.
This is something I've mentioned many times before,
but since ZIPP manufactures its own original hubs in-house,
there are no constraints like
"having DT make the hubs for us,"
which is why the spokes they use in their wheels
have consistently been Sapim.
And I believe the CX Sprint spoke
was made available for general sale
as a kind of spillover from ZIPP's large volume orders
(no source for this opinion).
However, even ZIPP itself only uses CX Sprint
as a weight-reduction measure, saying
"we adopt CX-RAY on the top-tier models
to differentiate through total weight savings of both wheels."
What I'm getting at is that ZIPP only builds wheels
with either all-black CX-RAY
or all-black CX Sprint.
Because of CX Sprint,
ZIPP allows me to build wheels with
"different spoke weights on the left and right
with slightly different diameters,
yet aero spokes on both sides,"
so I am grateful to ZIPP.
I thought the right side spokes seemed loose,
and indeed, when I looked at the wheel center before disassembly,
the rim had shifted to the right.
If I were to center this using only right side nipple adjustment,
it would mean reducing spoke tension,
which means "in the original state,
the right side was more tensioned
than in the centered condition."
I didn't notice this much on the rear wheel,
but on the front wheel, all the nipples
had fine sand packed in their slots.
It's hard to imagine the front and rear wheels had different usage histories,
so the reason is unclear.
One spoke was bent.
The original wheel had wobbles at two spots,
so one of those might have been
this spoke's phase.
I mentioned earlier that the ZIPP hub's right flange is wider,
but Grota-Tac's is even wider.
While Grota-Tac gains more lateral stiffness,
if you do a standard same-diameter same-count lacing on both sides,
the right side will be loose.
However, since Grota-Tac hubs have asymmetric left-right flanges,
if you do a CX-RAY 4-cross lacing
and match the left side spoke tension
to ZIPP's original tension, there's a possibility
the right side could be even more tensioned than ZIPP's hub.
The hub shell is asymmetrical in shape,
like a chess piece or peppermill,
and even on the ZR1's rim-brake hub,
the hub shell has this same shape
minus the disc mount.
Rebuilt.
Grota-Tac hub, 24H, semi-CX Sprint,
6-4 reverse Italian lacing.
I'll do the spoke crossing later.
Since ZIPP discontinued their individual rim sales,
I can only check rim weight
when doing rebuilds.
So this is fairly valuable information, I think,
but of course I'm not going to tell anyone.
↑Wow, that's a bad attitude
Sorry for the wait! Please check out this image!
Front rim!
Rear rim!
↑Stop it!
Following yesterday's rear wheel,
I'm rebuilding the front wheel of the 303 Firecrest.
ZIPP ZR1 disc hub, 24H
All-black CX Sprint, 4-cross reverse Italian lacing.
If the spokes after rebuilding weren't silver,
I might have reused the black CX Sprint.
It wasn't as bad as the rear wheel,
but the spokes were also laying on one side,
and the right side spokes (on the non-rotor-mount side)
showed significant deformation.
The large difference in spoke tension between left and right
might also be related to
the right side hub flange being wider.
This is something I've mentioned many times before,
but since ZIPP manufactures its own original hubs in-house,
there are no constraints like
"having DT make the hubs for us,"
which is why the spokes they use in their wheels
have consistently been Sapim.
And I believe the CX Sprint spoke
was made available for general sale
as a kind of spillover from ZIPP's large volume orders
(no source for this opinion).
However, even ZIPP itself only uses CX Sprint
as a weight-reduction measure, saying
"we adopt CX-RAY on the top-tier models
to differentiate through total weight savings of both wheels."
What I'm getting at is that ZIPP only builds wheels
with either all-black CX-RAY
or all-black CX Sprint.
Because of CX Sprint,
ZIPP allows me to build wheels with
"different spoke weights on the left and right
with slightly different diameters,
yet aero spokes on both sides,"
so I am grateful to ZIPP.
I thought the right side spokes seemed loose,
and indeed, when I looked at the wheel center before disassembly,
the rim had shifted to the right.
If I were to center this using only right side nipple adjustment,
it would mean reducing spoke tension,
which means "in the original state,
the right side was more tensioned
than in the centered condition."
I didn't notice this much on the rear wheel,
but on the front wheel, all the nipples
had fine sand packed in their slots.
It's hard to imagine the front and rear wheels had different usage histories,
so the reason is unclear.
One spoke was bent.
The original wheel had wobbles at two spots,
so one of those might have been
this spoke's phase.
I mentioned earlier that the ZIPP hub's right flange is wider,
but Grota-Tac's is even wider.
While Grota-Tac gains more lateral stiffness,
if you do a standard same-diameter same-count lacing on both sides,
the right side will be loose.
However, since Grota-Tac hubs have asymmetric left-right flanges,
if you do a CX-RAY 4-cross lacing
and match the left side spoke tension
to ZIPP's original tension, there's a possibility
the right side could be even more tensioned than ZIPP's hub.
The hub shell is asymmetrical in shape,
like a chess piece or peppermill,
and even on the ZR1's rim-brake hub,
the hub shell has this same shape
minus the disc mount.
Rebuilt.
Grota-Tac hub, 24H, semi-CX Sprint,
6-4 reverse Italian lacing.
I'll do the spoke crossing later.
Since ZIPP discontinued their individual rim sales,
I can only check rim weight
when doing rebuilds.
So this is fairly valuable information, I think,
but of course I'm not going to tell anyone.
↑Wow, that's a bad attitude
Sorry for the wait! Please check out this image!
Front rim!
Rear rim!
↑Stop it!