Another wheel day (and so on).
A customer entrusted me with a ZIPP 340 rim and a 440 rim.
In terms of rim height, they're equivalent to the current 303 and 404 models.
Since both are 24H, the 340 with the lower rim height ended up being built as the front wheel.
I have a 340 myself, and judging by the label date,
mine appears to be a slightly later model.
This rim can take more tension than the next MID-V280 or 285 that came after it,
but it's not the kind of rim you can tension up with satisfaction like recent carbon rims.
I know (for some reason) the breaking point of this rim,
so I do finish building it before that limit,
but there's still a nerve-wracking, walking-on-thin-ice kind of fear to it.
I built it with an Evolite 24H hub, CX-RAY reverse-pull spokes, radial lacing.
The holes around the outer edge are so tight that nipples barely fit through,
so you can't insert a washer between the nipple and rim.
Also, as what appears to be a specification for buckling and brake compression resistance,
there's foam polyurethane filling only in the area directly beneath the brake zone, but
unlike a Corima, it doesn't just clear a path for the nipples—
the interior is quite cavernous.
As far as I know, this rim is
"the most troublesome rim to retrieve if you drop a nipple inside."
(The 440 is somewhat easier since it has greater rim height.)
I didn't make any such mistakes this time,
but looking at the diagram I drew makes me annoyed.
Don't bounce around looking so cheerful—just come out already!
A customer entrusted me with a ZIPP 340 rim and a 440 rim.
In terms of rim height, they're equivalent to the current 303 and 404 models.
Since both are 24H, the 340 with the lower rim height ended up being built as the front wheel.
I have a 340 myself, and judging by the label date,
mine appears to be a slightly later model.
This rim can take more tension than the next MID-V280 or 285 that came after it,
but it's not the kind of rim you can tension up with satisfaction like recent carbon rims.
I know (for some reason) the breaking point of this rim,
so I do finish building it before that limit,
but there's still a nerve-wracking, walking-on-thin-ice kind of fear to it.
I built it with an Evolite 24H hub, CX-RAY reverse-pull spokes, radial lacing.
The holes around the outer edge are so tight that nipples barely fit through,
so you can't insert a washer between the nipple and rim.
Also, as what appears to be a specification for buckling and brake compression resistance,
there's foam polyurethane filling only in the area directly beneath the brake zone, but
unlike a Corima, it doesn't just clear a path for the nipples—
the interior is quite cavernous.
As far as I know, this rim is
"the most troublesome rim to retrieve if you drop a nipple inside."
(The 440 is somewhat easier since it has greater rim height.)
I didn't make any such mistakes this time,
but looking at the diagram I drew makes me annoyed.
Don't bounce around looking so cheerful—just come out already!