Another day, another wheel (and so on).
Following up on the front wheel I built the other day,
I was attempting to convert the Shimano freebody on the DT240S BOOST rear hub
to SRAM XD when it turned out I was missing parts,
so I had to abandon the wheel build.
At DT, the freebody plus right end cap set is called a rotor kit,
but the bag with the rotor kit that the customer left with me didn't have the right end cap inside,
so I couldn't convert it to an XD freebody.
The reason the bag was missing it wasn't because the customer lost it—
it apparently never came with one to begin with. When I asked whether they bought it
at a physical shop or through overseas mail order, it turned out to be the former.
So I had our shop special order just the right end cap.
Just to be clear, normally this part isn't sold as a standalone unit.
How I managed it is a secret.
So the XD freebody was in the bag they provided,
but since the customer currently intends to use it with Shimano,
I'll swap back to the Shimano rotor kit and build the wheel,
though there's something I need to check first.
The rotor kit comes with a right end cap,
and the length of this end cap differs between, say, Shimano 10-speed quick-release
and Shimano 11-speed quick-release,
which changes both the derailleur adjustment position and the wheel center.
So if I build the rear wheel with a Shimano rotor kit this time,
and later the customer converts it to a SRAM XD rotor kit,
the derailleur adjustment aside, if wheel centering becomes necessary,
that could get a bit messy.
I measured the over-locknut dimension
with the SRAM XD rotor kit installed.
It's the BOOST standard, so it should be 148mm nominal,
but my actual measurement came to 147.9mm.
I switched back to the Shimano freebody.
Here's an important caveat: on the 240S BOOST hub,
regardless of the freebody standard, the left end cap is the same.
We're not swapping the left end cap for one with different dimensions.
I measured it.
148.0mm.
So that's within the margin of error—at minimum,
the wheel center won't shift when swapping between these two rotor kits.
DT rear hubs have the freewheel body pressed in quite tightly,
so after extended use mounted on a frame,
you can't remove the freebody with hand strength alone—
you need a tool called a hub cone wrench.
At the stage of just the bare hub, I was able to swap the freebody by hand.
In other words, accounting for the dimensional compression when the hub is clamped
by a quick-release or through-axle, that 0.1mm measurement difference is meaningless.
So I'm giving this bag to the customer not as a SRAM XD freebody,
but as a complete rotor kit.
Done.
DT240S 12/148mm hub, 28H, semi-competition, JIS standard, laced with tie-rods.
It doesn't look like an offset rim,
but I did follow the instructions about which side goes where.
Come to think of it, in the front wheel article I mentioned this rim has a secret.
It's not much of a secret really,
but this RM29C06 rim comes in two specs: Standard and Flyweight,
and both my front and rear wheels use the Flyweight version.
The spoke tension specs are the same,
but the weight limit differs—Standard is 100kg, Flyweight is 90kg—
and the nominal weight is 360g for Standard, which is already plenty light,
but Flyweight comes in at just 280g.
A 27mm wide rim, hookless but with ear bosses unlike tubulars,
and it's sub-300g in actual weight—that's hard to believe.
I actually weighed it myself,
but when you think about it, there's nothing in it for me
to post that here, so I'll refrain.
↑ man, what a jerk
My apologies for the wait! Please take a look at this image!
The rim I used for the front wheel!
The rim I used for the rear wheel!
↑ Cut it out already!
Following up on the front wheel I built the other day,
I was attempting to convert the Shimano freebody on the DT240S BOOST rear hub
to SRAM XD when it turned out I was missing parts,
so I had to abandon the wheel build.
At DT, the freebody plus right end cap set is called a rotor kit,
but the bag with the rotor kit that the customer left with me didn't have the right end cap inside,
so I couldn't convert it to an XD freebody.
The reason the bag was missing it wasn't because the customer lost it—
it apparently never came with one to begin with. When I asked whether they bought it
at a physical shop or through overseas mail order, it turned out to be the former.
So I had our shop special order just the right end cap.
Just to be clear, normally this part isn't sold as a standalone unit.
How I managed it is a secret.
So the XD freebody was in the bag they provided,
but since the customer currently intends to use it with Shimano,
I'll swap back to the Shimano rotor kit and build the wheel,
though there's something I need to check first.
The rotor kit comes with a right end cap,
and the length of this end cap differs between, say, Shimano 10-speed quick-release
and Shimano 11-speed quick-release,
which changes both the derailleur adjustment position and the wheel center.
So if I build the rear wheel with a Shimano rotor kit this time,
and later the customer converts it to a SRAM XD rotor kit,
the derailleur adjustment aside, if wheel centering becomes necessary,
that could get a bit messy.
I measured the over-locknut dimension
with the SRAM XD rotor kit installed.
It's the BOOST standard, so it should be 148mm nominal,
but my actual measurement came to 147.9mm.
I switched back to the Shimano freebody.
Here's an important caveat: on the 240S BOOST hub,
regardless of the freebody standard, the left end cap is the same.
We're not swapping the left end cap for one with different dimensions.
I measured it.
148.0mm.
So that's within the margin of error—at minimum,
the wheel center won't shift when swapping between these two rotor kits.
DT rear hubs have the freewheel body pressed in quite tightly,
so after extended use mounted on a frame,
you can't remove the freebody with hand strength alone—
you need a tool called a hub cone wrench.
At the stage of just the bare hub, I was able to swap the freebody by hand.
In other words, accounting for the dimensional compression when the hub is clamped
by a quick-release or through-axle, that 0.1mm measurement difference is meaningless.
So I'm giving this bag to the customer not as a SRAM XD freebody,
but as a complete rotor kit.
Done.
DT240S 12/148mm hub, 28H, semi-competition, JIS standard, laced with tie-rods.
It doesn't look like an offset rim,
but I did follow the instructions about which side goes where.
Come to think of it, in the front wheel article I mentioned this rim has a secret.
It's not much of a secret really,
but this RM29C06 rim comes in two specs: Standard and Flyweight,
and both my front and rear wheels use the Flyweight version.
The spoke tension specs are the same,
but the weight limit differs—Standard is 100kg, Flyweight is 90kg—
and the nominal weight is 360g for Standard, which is already plenty light,
but Flyweight comes in at just 280g.
A 27mm wide rim, hookless but with ear bosses unlike tubulars,
and it's sub-300g in actual weight—that's hard to believe.
I actually weighed it myself,
but when you think about it, there's nothing in it for me
to post that here, so I'll refrain.
↑ man, what a jerk
My apologies for the wait! Please take a look at this image!
The rim I used for the front wheel!
The rim I used for the rear wheel!
↑ Cut it out already!