Another wheel build today (and so on).
Built a rear wheel with Stans' Crest MK4 rim.
Duro hub 28H black half CX sprint
Built JIS 46-spoke pattern with black aluminum nipples.
I'll lace the spokes later.
The Crest MK3 had an internal width of 23mm,
but the MK4 is now 25mm and features an offset design as well.
Stans rims use their proprietary
BST (Bead Socket Technology)
hook design, where the outer edge has a subtle depression
that catches the tire bead,
making the hook extremely shallow.
You can feel the hook if you touch it, but
visually it's basically a hookless rim already.
The 25mm internal width is
something that already exists on wide rims for road bikes,
since road rims have been getting wider faster lately.
The stated tire width compatibility for the Crest MK4 is
40mm～2.3 inches, which annoyed me because they can't pick one unit,
but calculating it out comes to
roughly 40～58mm
or 1.6～2.3 inches.
Road bikes have 28C tire compatibility at 25mm internal width,
and Stans doesn't explicitly state their rims are tubeless-only,
so stretching that interpretation, if you put
a tubed 28C tire on the Crest MK4 at around 6 bar,
the tire will probably come off.
Even with the previous MK3's 23mm internal width,
the Crest with an IRC Sirac CX 32C at 1.8 bar
becomes roughly 33.5mm wide, which violates
cyclocross regulations (in higher categories)
and can't be used
(though 30C tires can sometimes be used in an overstressed state).
Road, cyclocross, and MTB—
the rim widths for road and MTB have become incredibly similar,
with cyclocross now being the narrowest category.
That's something unthinkable compared to how things used to be.
If MTBs hadn't gone to the BOOST standard,
there might have been wheels shared between road and XC
(though the front hub inner diameter would differ).
Also, cyclocross has higher affinity for tubular tires than road bikes.
This is partly because pinch flats are virtually non-existent at low pressures,
but tubular tires have tire width at a given pressure that's
basically unrelated to rim width, so
wide rims don't matter; and more importantly,
if a tire sidewall has the manufacturer's official marking of
32C or 33C, even if actual measurement at some point
showed it exceeding 33mm width, it gets a pass—
this rule applies only to tubulars.
So, even if a tubular tire was clearly made as a 34C or 35C,
if the maker insists it's a 33C,
both the maker and the user know what's going on, so
it's a lose-lose to be pedantic about it,
which is why there's an unspoken agreement
to keep quiet and produce such tires.
Actually, such things already exist,
but maybe I'm just keeping quiet about them too.
Anyway, this reminds me of the Prohibition era in America,
when concentrated grape extract brick blocks were sold with labels saying
"Dissolve this in hot water and mix to make
delicious grape juice.
However, do not let it sit and ferment naturally,
as it will turn into wine"—
a warning that came with it.
Built a rear wheel with Stans' Crest MK4 rim.
Duro hub 28H black half CX sprint
Built JIS 46-spoke pattern with black aluminum nipples.
I'll lace the spokes later.
The Crest MK3 had an internal width of 23mm,
but the MK4 is now 25mm and features an offset design as well.
Stans rims use their proprietary
BST (Bead Socket Technology)
hook design, where the outer edge has a subtle depression
that catches the tire bead,
making the hook extremely shallow.
You can feel the hook if you touch it, but
visually it's basically a hookless rim already.
The 25mm internal width is
something that already exists on wide rims for road bikes,
since road rims have been getting wider faster lately.
The stated tire width compatibility for the Crest MK4 is
40mm～2.3 inches, which annoyed me because they can't pick one unit,
but calculating it out comes to
roughly 40～58mm
or 1.6～2.3 inches.
Road bikes have 28C tire compatibility at 25mm internal width,
and Stans doesn't explicitly state their rims are tubeless-only,
so stretching that interpretation, if you put
a tubed 28C tire on the Crest MK4 at around 6 bar,
the tire will probably come off.
Even with the previous MK3's 23mm internal width,
the Crest with an IRC Sirac CX 32C at 1.8 bar
becomes roughly 33.5mm wide, which violates
cyclocross regulations (in higher categories)
and can't be used
(though 30C tires can sometimes be used in an overstressed state).
Road, cyclocross, and MTB—
the rim widths for road and MTB have become incredibly similar,
with cyclocross now being the narrowest category.
That's something unthinkable compared to how things used to be.
If MTBs hadn't gone to the BOOST standard,
there might have been wheels shared between road and XC
(though the front hub inner diameter would differ).
Also, cyclocross has higher affinity for tubular tires than road bikes.
This is partly because pinch flats are virtually non-existent at low pressures,
but tubular tires have tire width at a given pressure that's
basically unrelated to rim width, so
wide rims don't matter; and more importantly,
if a tire sidewall has the manufacturer's official marking of
32C or 33C, even if actual measurement at some point
showed it exceeding 33mm width, it gets a pass—
this rule applies only to tubulars.
So, even if a tubular tire was clearly made as a 34C or 35C,
if the maker insists it's a 33C,
both the maker and the user know what's going on, so
it's a lose-lose to be pedantic about it,
which is why there's an unspoken agreement
to keep quiet and produce such tires.
Actually, such things already exist,
but maybe I'm just keeping quiet about them too.
Anyway, this reminds me of the Prohibition era in America,
when concentrated grape extract brick blocks were sold with labels saying
"Dissolve this in hot water and mix to make
delicious grape juice.
However, do not let it sit and ferment naturally,
as it will turn into wine"—
a warning that came with it.