Another day, another wheel (and so on).
Built the rear wheel to match the front wheel from the other day.
HB-7600 110-8 rear hub 36H
Hoshi NJS round butted spokes, 88 Italian lacing pattern.
Even though the hub has threads on both sides,
since we're only mounting a sprocket on one side,
I was told it was fine to use Italian lacing.
The 110-8 specification means
the over-locknut distance is 110mm instead of 120mm,
and even though the hub axle is 10mm diameter,
there's also a 8mm width flat surface machined on it.
Frames designed for this have an 8mm wide claw slot,
with the flat on the hub axle serving as the anti-rotation feature.
The packing vinyl was stuck together so badly
it took an enormous amount of time to peel off.
Though not quite as much as building the wheel itself.
There's still some residue left, but since I'm out of adhesive remover,
I kept it to a level where I can clean it after the wheel is built
and prioritized getting the wheel together.
Compared to current models that are nominally 335g, measuring just over 350g,
this rim is over 10% lighter (by actual measurement) and is a precious item,
so toward the end I was turning the nipples
like I was tiptoeing across thin ice.
I always use a tension gauge when building wheels,
but with these front and rear wheels,
I've checked the gauge far more times than usual.
↑NJS round spokes
↑NJS aero butted spokes
About the spoke specific gravity difference I mentioned with the front wheel.
Both images show 305mm with 36 spokes,
and when building track cycling wheels, they're used as-is without machining,
so the weight of spokes in the wheel
is consistent between these two types.
For spoke specific gravity:
Round spokes work out to 185.6÷36÷305÷0.0257=
0.657722221..., so roughly
65-66%.
Slightly heavier than CX-RAY,
but CX-RAY is 14-gauge based while NJS spokes are 15-gauge based,
so the cross-sectional area of the butted section
is smaller on CX-RAY.
The aero spokes work out to 209.3÷36÷305÷0.0257=
0.741709337..., so
roughly 74%.
Similar to what you'd get if you took the 78% CX Sprint and made it 15-gauge base.
Huh? You want to know about that other weight thing I mentioned with the front wheel—
the actual measured weight of the rim?
There's no way anyone's giving that out for free
↑man, this guy's got an attitude
Thank you for your patience! Please take a look at this image!
The rim used for the front wheel!
The rim used for the rear wheel!
This one still has vinyl stuck to it,
but removing it won't change the weight by even 1g, I'd say!
I was trying to use the lighter one for the rear wheel,
but due to various circumstances it didn't work out!
If it was over 10g difference, I'd make sure
to build the rear wheel with the lighter one no matter what!
↑Cut it out already!
Built the rear wheel to match the front wheel from the other day.
HB-7600 110-8 rear hub 36H
Hoshi NJS round butted spokes, 88 Italian lacing pattern.
Even though the hub has threads on both sides,
since we're only mounting a sprocket on one side,
I was told it was fine to use Italian lacing.
The 110-8 specification means
the over-locknut distance is 110mm instead of 120mm,
and even though the hub axle is 10mm diameter,
there's also a 8mm width flat surface machined on it.
Frames designed for this have an 8mm wide claw slot,
with the flat on the hub axle serving as the anti-rotation feature.
The packing vinyl was stuck together so badly
it took an enormous amount of time to peel off.
Though not quite as much as building the wheel itself.
There's still some residue left, but since I'm out of adhesive remover,
I kept it to a level where I can clean it after the wheel is built
and prioritized getting the wheel together.
Compared to current models that are nominally 335g, measuring just over 350g,
this rim is over 10% lighter (by actual measurement) and is a precious item,
so toward the end I was turning the nipples
like I was tiptoeing across thin ice.
I always use a tension gauge when building wheels,
but with these front and rear wheels,
I've checked the gauge far more times than usual.
↑NJS round spokes
↑NJS aero butted spokes
About the spoke specific gravity difference I mentioned with the front wheel.
Both images show 305mm with 36 spokes,
and when building track cycling wheels, they're used as-is without machining,
so the weight of spokes in the wheel
is consistent between these two types.
For spoke specific gravity:
Round spokes work out to 185.6÷36÷305÷0.0257=
0.657722221..., so roughly
65-66%.
Slightly heavier than CX-RAY,
but CX-RAY is 14-gauge based while NJS spokes are 15-gauge based,
so the cross-sectional area of the butted section
is smaller on CX-RAY.
The aero spokes work out to 209.3÷36÷305÷0.0257=
0.741709337..., so
roughly 74%.
Similar to what you'd get if you took the 78% CX Sprint and made it 15-gauge base.
Huh? You want to know about that other weight thing I mentioned with the front wheel—
the actual measured weight of the rim?
There's no way anyone's giving that out for free
↑man, this guy's got an attitude
Thank you for your patience! Please take a look at this image!
The rim used for the front wheel!
The rim used for the rear wheel!
This one still has vinyl stuck to it,
but removing it won't change the weight by even 1g, I'd say!
I was trying to use the lighter one for the rear wheel,
but due to various circumstances it didn't work out!
If it was over 10g difference, I'd make sure
to build the rear wheel with the lighter one no matter what!
↑Cut it out already!