Today it's wheels again (and so on).
I built an MTB rear wheel using
Duke's ultra-light rim, the Lucky Jack Ultra SLS4,
Berd (ベルド) polyethylene spokes,
and an ExtraLight hub.
Hyperboost 3 Hub, 28H
Forced left-right 2-cross lacing &
Per Berd's specifications, all spoke crossings are prohibited from touching/crossing during weaving.
The rim is the Ultra SLS4 from Duke's Lucky Jack series.
First, there's an SLS4 model,
and it comes in multiple rim widths under the same name
with rim height (mm) / internal width (mm) / claimed weight (g) of
19 / 25.6 / 280
20.5 / 28 / 290
20.5 / 30.5 / 300
The lightweight version is the Ultra SLS4
with rim height (mm) / internal width (mm) / claimed weight (g) of
18.5 / 24.5 / 255
19 / 28 / 265
20.5 / 30.5 / 275
If we're talking pure lightness,
there's the Lucky Jack SLS5 model
which offers a 20mm rim height / 28mm internal width rim
manufactured in different weights for specific uses:
242g front wheel only
285g rear wheel or aggressive front wheel use
340g aggressive rear wheel use
The 242g version is lighter,
but that's probably not the rim width the customer was looking for.
Additionally, the SLS5 also comes in
a 20mm rim height / 31mm internal width specification,
which weighs
245g front wheel only
285g rear wheel or aggressive front wheel use
340g aggressive rear wheel use
—nearly the same weight as the 28mm internal width version.
This SLS5 is about 10% lighter than the previous generation,
but according to the manufacturer's website,
shipments begin in May 2026.
The rear wheel weight, just so you know.
Even for a front wheel, this would be considered ultra-light weight.
I built an MTB rear wheel using
Duke's ultra-light rim, the Lucky Jack Ultra SLS4,
Berd (ベルド) polyethylene spokes,
and an ExtraLight hub.
Hyperboost 3 Hub, 28H
Forced left-right 2-cross lacing &
Per Berd's specifications, all spoke crossings are prohibited from touching/crossing during weaving.
The rim is the Ultra SLS4 from Duke's Lucky Jack series.
First, there's an SLS4 model,
and it comes in multiple rim widths under the same name
with rim height (mm) / internal width (mm) / claimed weight (g) of
19 / 25.6 / 280
20.5 / 28 / 290
20.5 / 30.5 / 300
The lightweight version is the Ultra SLS4
with rim height (mm) / internal width (mm) / claimed weight (g) of
18.5 / 24.5 / 255
19 / 28 / 265
20.5 / 30.5 / 275
If we're talking pure lightness,
there's the Lucky Jack SLS5 model
which offers a 20mm rim height / 28mm internal width rim
manufactured in different weights for specific uses:
242g front wheel only
285g rear wheel or aggressive front wheel use
340g aggressive rear wheel use
The 242g version is lighter,
but that's probably not the rim width the customer was looking for.
Additionally, the SLS5 also comes in
a 20mm rim height / 31mm internal width specification,
which weighs
245g front wheel only
285g rear wheel or aggressive front wheel use
340g aggressive rear wheel use
—nearly the same weight as the 28mm internal width version.
This SLS5 is about 10% lighter than the previous generation,
but according to the manufacturer's website,
shipments begin in May 2026.
The rear wheel weight, just so you know.
Even for a front wheel, this would be considered ultra-light weight.