Another day working on wheels (and so on...).
Continuing from the other day.
I'm changing the rear rim on the Axiom disc to
this rim.
It has a Shimano freebody on it,
but the customer has left me a SRAM XDR freebody,
so I'm swapping it over.
The freebody spline has a seal wrapped around it,
and even though this is an unused wheel
the Instant Drive 360 proprietary grease
has already been wiped off the ratchet surfaces,
and it was leaking out in places it shouldn't.
For a Mavic rear wheel, the center offset is pretty minimal.
By the way, this is the state before the freebody swap,
but on this wheel, changing the freebody
doesn't affect the wheel center.
When I took the wheel apart,
unlike the front wheel, the spoke lengths differ between left and right—
I measured them at exactly 4mm difference.
That's wrong.
The hub is high-low flange,
and when I measured the hub dimensions myself
and checked the left-right spoke length difference,
it came out to about 2mm.
I mentioned this when discussing the front wheel,
but even if the left and right spoke lengths differ by
about 1mm on the front and 2mm on the rear due to the Ōchoko,
if you extend the thread length like these spokes do
beyond what standard spokes have, you can achieve
left-right compatibility with that length redundancy.
But this 4mm difference basically has the short side at its lower limit
and the long side right at its upper limit.
In other words, you could do left-right compatibility with a single intermediate length
within this 4mm difference,
but instead they deliberately made two precarious different lengths—
which makes no sense.
When changing the rim, I cut the spoke length,
but when threading afterward,
the spoke thread length can only be made the same as standard spokes.
In other words, there's no redundancy from special thread length,
but I made the wheel work with a 2mm difference between left and right.
This is proof that you don't need a 4mm difference between left and right.
Got it together.
I don't have a photo of the original state,
but looking just at the final cross overlap,
I changed it from what looked like reverse-JIS lacing
to what looks like JIS lacing.
The image above is the view from the wheel's right side (free side).
With bent-elbow spokes doing double-cross,
the final cross overlap appears mirrored,
so Mavic's original interpretation isn't entirely wrong either.
However, I don't interpret the contact at the flattened section
of this Axiom spoke as "weaving,"
so I prioritized the appearance of the final cross.
What matters is that if you're doing JIS lacing, for example,
when viewing the wheel from the right side,
the N-spoke should be in the porcupine direction on the free side
and anti-porcupine direction on the non-free side,
but on this hub the spoke head positions are the same left and right,
and the normal interpretation of N-spoke/anti-N-spoke
doesn't exist on the hub side, so there is no correct answer.
If you determine the spoke overlap shape based on the direction of the "weaving cross"
that first receives the twisting stress from pedaling torque near the hub,
then interpreting the overlap at the flattened section near the Axiom spoke head
as "weaving" means Mavic is correct.
In the end, it comes down to whether you interpret the cross just before the final cross
as weaving or not.
So if I were to build this wheel without weaving the final cross,
would I build it with Mavic's interpretation?
That's a tough question.
If the answer is yes, that contradicts the earlier point about
"not interpreting the flattened section contact as weaving."
↑rear wheel
↑front wheel
The hub body alignment seen from the valve hole was sloppy,
so I tried to align it with the MAVIC logo as much as possible,
but this customer willremove rim stickers even on major brand wheels
(even on Cosmic Carbons if they come off),
so this attention to detail will probably be wasted.
I didn't note the weight of the carbon rim after rebuilding because
I didn't ask the customer where it came from
and frankly don't care.
Put differently,
it has no value as article content.
The Axiom disc rim is probably different.
If they're already using the wheel and want to know the rim's standalone weight,
or if they're considering buying one as a reference,
way more people would want that info than for some mystery carbon rim.
So I'm not telling.
I'm not about to just hand that info out.
↑yikes what's wrong with this guy
Thank you for waiting! Please see this image!
I don't think there's any difference,
but the top is the front rim and the bottom is the rear rim!
↑stop it!
Continuing from the other day.
I'm changing the rear rim on the Axiom disc to
this rim.
It has a Shimano freebody on it,
but the customer has left me a SRAM XDR freebody,
so I'm swapping it over.
The freebody spline has a seal wrapped around it,
and even though this is an unused wheel
the Instant Drive 360 proprietary grease
has already been wiped off the ratchet surfaces,
and it was leaking out in places it shouldn't.
For a Mavic rear wheel, the center offset is pretty minimal.
By the way, this is the state before the freebody swap,
but on this wheel, changing the freebody
doesn't affect the wheel center.
When I took the wheel apart,
unlike the front wheel, the spoke lengths differ between left and right—
I measured them at exactly 4mm difference.
That's wrong.
The hub is high-low flange,
and when I measured the hub dimensions myself
and checked the left-right spoke length difference,
it came out to about 2mm.
I mentioned this when discussing the front wheel,
but even if the left and right spoke lengths differ by
about 1mm on the front and 2mm on the rear due to the Ōchoko,
if you extend the thread length like these spokes do
beyond what standard spokes have, you can achieve
left-right compatibility with that length redundancy.
But this 4mm difference basically has the short side at its lower limit
and the long side right at its upper limit.
In other words, you could do left-right compatibility with a single intermediate length
within this 4mm difference,
but instead they deliberately made two precarious different lengths—
which makes no sense.
When changing the rim, I cut the spoke length,
but when threading afterward,
the spoke thread length can only be made the same as standard spokes.
In other words, there's no redundancy from special thread length,
but I made the wheel work with a 2mm difference between left and right.
This is proof that you don't need a 4mm difference between left and right.
Got it together.
I don't have a photo of the original state,
but looking just at the final cross overlap,
I changed it from what looked like reverse-JIS lacing
to what looks like JIS lacing.
The image above is the view from the wheel's right side (free side).
With bent-elbow spokes doing double-cross,
the final cross overlap appears mirrored,
so Mavic's original interpretation isn't entirely wrong either.
However, I don't interpret the contact at the flattened section
of this Axiom spoke as "weaving,"
so I prioritized the appearance of the final cross.
What matters is that if you're doing JIS lacing, for example,
when viewing the wheel from the right side,
the N-spoke should be in the porcupine direction on the free side
and anti-porcupine direction on the non-free side,
but on this hub the spoke head positions are the same left and right,
and the normal interpretation of N-spoke/anti-N-spoke
doesn't exist on the hub side, so there is no correct answer.
If you determine the spoke overlap shape based on the direction of the "weaving cross"
that first receives the twisting stress from pedaling torque near the hub,
then interpreting the overlap at the flattened section near the Axiom spoke head
as "weaving" means Mavic is correct.
In the end, it comes down to whether you interpret the cross just before the final cross
as weaving or not.
So if I were to build this wheel without weaving the final cross,
would I build it with Mavic's interpretation?
That's a tough question.
If the answer is yes, that contradicts the earlier point about
"not interpreting the flattened section contact as weaving."
↑rear wheel
↑front wheel
The hub body alignment seen from the valve hole was sloppy,
so I tried to align it with the MAVIC logo as much as possible,
but this customer will
(even on Cosmic Carbons if they come off),
so this attention to detail will probably be wasted.
I didn't note the weight of the carbon rim after rebuilding because
I didn't ask the customer where it came from
and frankly don't care.
Put differently,
it has no value as article content.
The Axiom disc rim is probably different.
If they're already using the wheel and want to know the rim's standalone weight,
or if they're considering buying one as a reference,
way more people would want that info than for some mystery carbon rim.
So I'm not telling.
I'm not about to just hand that info out.
↑yikes what's wrong with this guy
Thank you for waiting! Please see this image!
I don't think there's any difference,
but the top is the front rim and the bottom is the rear rim!
↑stop it!