Another wheel build day (and so on).
A customer brought me a rim that has no holes on the outer circumference
except for the valve hole.
Since it's not a hookless rim,
it can also be used with traditional tubes.
Extremely lightweight.
According to the manufacturer's specs, the rated weight is 295g,
and the weight printed on the serial number label
embedded in the rim's outer circumference
was 285g for both rims.
Our shop scale showed 285g and 286g,
so I'll build the front wheel with the 286g rim.
Since both rims this time had 285g printed on them,
I can't say for certain whether
"all rims have 285g printed" or
"each rim has its individual weight printed,"
but I suspect it's the latter.
Given that they're printing individual weights like 292g or 287g
on other rims under 295g,
I'm guessing that this time both happened to
come out to 285g.
The inner circumference of the rim had a puffy feel to it,
with a stepped, bulging profile.
Quite the nipple, if you will.
Good kids shouldn't search for "puffy nipple."
I put masking tape on the rim in the image above
to make the outline easier to see.
The manufacturer calls this feature a "keel"
(after a ship's keel),
and I initially thought it was to increase spoke tension limits,
but apparently the lateral rim stiffness
increases by 35%.
The rim's rated maximum spoke tension is
130 kgf,
but I won't tension it anywhere near that.
The ERD (Effective Rim Diameter) differed by
1.5mm in diameter (0.75mm in radius) between the manufacturer's spec and my measurement,
but the resulting spoke length calculation
falls within the tolerance of the nipple thread engagement,
so I based my spoke length on the rated ERD.
The build worked out fine,
but I would have preferred the spoke length
to be about 1mm longer to my taste.
Built it up.
A Goldix brand R240 SL
hub for straight-pull spokes
24H black half CX Sprint spokes
built with forced left-right 2-cross lacing, black aluminum nipples.
I'll do the tying later.
The right-side CX-RAY spokes require tying,
so I'll weave the final crossing,
but for the left-side CX Sprint, either way works,
so I decided to weave it too.
In the image above, you can see how the spoke exiting
the inner flange hole becomes the outer spoke
at the final crossing.
While I can't visually inspect it on this rim,
the sliding surface of the nipples
inside the rim holes is likely rounded.
Black aluminum nipples and other colored nipples like purple or dark blue
should have higher friction with the rim,
but the nipples rotated smoothly and easily without any lubrication.
Also, the radial runout during test-fitting was nearly nonexistent,
so either the precision is excellent, the rim is stiff, or both.
A customer brought me a rim that has no holes on the outer circumference
except for the valve hole.
Since it's not a hookless rim,
it can also be used with traditional tubes.
Extremely lightweight.
According to the manufacturer's specs, the rated weight is 295g,
and the weight printed on the serial number label
embedded in the rim's outer circumference
was 285g for both rims.
Our shop scale showed 285g and 286g,
so I'll build the front wheel with the 286g rim.
Since both rims this time had 285g printed on them,
I can't say for certain whether
"all rims have 285g printed" or
"each rim has its individual weight printed,"
but I suspect it's the latter.
Given that they're printing individual weights like 292g or 287g
on other rims under 295g,
I'm guessing that this time both happened to
come out to 285g.
The inner circumference of the rim had a puffy feel to it,
with a stepped, bulging profile.
Quite the nipple, if you will.
I put masking tape on the rim in the image above
to make the outline easier to see.
The manufacturer calls this feature a "keel"
(after a ship's keel),
and I initially thought it was to increase spoke tension limits,
but apparently the lateral rim stiffness
increases by 35%.
The rim's rated maximum spoke tension is
130 kgf,
but I won't tension it anywhere near that.
The ERD (Effective Rim Diameter) differed by
1.5mm in diameter (0.75mm in radius) between the manufacturer's spec and my measurement,
but the resulting spoke length calculation
falls within the tolerance of the nipple thread engagement,
so I based my spoke length on the rated ERD.
The build worked out fine,
but I would have preferred the spoke length
to be about 1mm longer to my taste.
Built it up.
A Goldix brand R240 SL
hub for straight-pull spokes
24H black half CX Sprint spokes
built with forced left-right 2-cross lacing, black aluminum nipples.
I'll do the tying later.
The right-side CX-RAY spokes require tying,
so I'll weave the final crossing,
but for the left-side CX Sprint, either way works,
so I decided to weave it too.
In the image above, you can see how the spoke exiting
the inner flange hole becomes the outer spoke
at the final crossing.
While I can't visually inspect it on this rim,
the sliding surface of the nipples
inside the rim holes is likely rounded.
Black aluminum nipples and other colored nipples like purple or dark blue
should have higher friction with the rim,
but the nipples rotated smoothly and easily without any lubrication.
Also, the radial runout during test-fitting was nearly nonexistent,
so either the precision is excellent, the rim is stiff, or both.