Another wheel day (and so on).
A customer left me with a Light Bicycle
RM29C06 carbon tubeless rim.
Light Bicycle has a logo shaped like the initials "LB",
and there should be a rim sticker with that logo,
but I'm not sure if the customer peeled it off or if it never came with one. Probably the latter.
Also, just a random thought, but the LB logo on Light Bicycle
reminds me a bit of the AM logo on Alex Moulton bikes.
It doesn't look asymmetrical, but there is a left-right designation... anyway,
this rim is a hookless rim with no bead hooks.
That's why I wrote "carbon tubeless rim" instead of "carbon WO rim" earlier.
The specified spoke tension is 110–130 kgf, with an upper limit of 140 kgf, but
given the rim's weight, I wouldn't have thought it could handle that much tension. Well, past tense now.
I have things to say about the rim's weight, but that's for another day.
Built it.
DT 240S Disc, 15/110mm hub, 28H
Half-comp six-cross lacing with spoke twist.
DT now distinguishes hubs by appending specifications after the model name:
through-axle diameter/overlock-nut dimension values.
For example, with a traditional quick-release front hub (non-disc),
the quick-release is treated as a 5mm through-axle in diameter,
giving the model name 240S 5/100mm.
This hub uses a 15mm through-axle with 110mm width, so
it's what we call the BOOST standard.
In the photo above, I shot from the left side of the hub, but
the hub shell logo is upside down. The rear hub logo is right-side up
(and yes, I'm making a point that I built it according to the left-right specifications).
As for spoke tension, it tensioned up beautifully—way more than the rim's weight would suggest.
It might be because the nipples are "S" type (see my previous post),
but this rim has none of the drag at high tension that you typically see with carbon rims—it just slides smoothly.
Though that said, high-tension drag isn't the same on all carbon rims;
there's actually quite a bit of variation between individual specimens.
I was going to build the rear wheel next, but...
The rear hub is 240S Disc, 12/148mm, also BOOST standard.
I need to swap the freebody from Shimano to SRAM XD Drive.
It's a confusing situation, but at DT they call the freebody + right end a
"rotor kit," and of course it has nothing to do with disc rotors.
Swapping the rotor kit from Shimano to SRAM XD Drive—
if you say that without explanation, it's pretty mysterious.
You don't often get the chance to disassemble a brand-new star ratchet hub.
It was helpful to see, as a reference, how much
star ratchet-specific grease was applied from the factory.
I did swap the freebody, but
the right end flange diameter doesn't match.
The 240S Disc hub accommodates 142mm and 148mm widths by swapping end pieces,
and further, parts are available for each width in both Shimano and SRAM XD versions.
But you don't have to buy these ends separately—
they should be included with the rotor kit.
For example, even with the same Shimano freebody, when upgrading from 10-speed to 11-speed,
DT has different right end lengths, so
you need to swap the entire rotor kit (freebody + right end).
The bag the customer gave me didn't have a right end in it.
So today I only got the front wheel built, and the rim's secrets will have to wait for another day.
A customer left me with a Light Bicycle
RM29C06 carbon tubeless rim.
Light Bicycle has a logo shaped like the initials "LB",
and there should be a rim sticker with that logo,
but I'm not sure if the customer peeled it off or if it never came with one. Probably the latter.
Also, just a random thought, but the LB logo on Light Bicycle
reminds me a bit of the AM logo on Alex Moulton bikes.
It doesn't look asymmetrical, but there is a left-right designation... anyway,
this rim is a hookless rim with no bead hooks.
That's why I wrote "carbon tubeless rim" instead of "carbon WO rim" earlier.
The specified spoke tension is 110–130 kgf, with an upper limit of 140 kgf, but
given the rim's weight, I wouldn't have thought it could handle that much tension. Well, past tense now.
I have things to say about the rim's weight, but that's for another day.
Built it.
DT 240S Disc, 15/110mm hub, 28H
Half-comp six-cross lacing with spoke twist.
DT now distinguishes hubs by appending specifications after the model name:
through-axle diameter/overlock-nut dimension values.
For example, with a traditional quick-release front hub (non-disc),
the quick-release is treated as a 5mm through-axle in diameter,
giving the model name 240S 5/100mm.
This hub uses a 15mm through-axle with 110mm width, so
it's what we call the BOOST standard.
In the photo above, I shot from the left side of the hub, but
the hub shell logo is upside down. The rear hub logo is right-side up
(and yes, I'm making a point that I built it according to the left-right specifications).
As for spoke tension, it tensioned up beautifully—way more than the rim's weight would suggest.
It might be because the nipples are "S" type (see my previous post),
but this rim has none of the drag at high tension that you typically see with carbon rims—it just slides smoothly.
Though that said, high-tension drag isn't the same on all carbon rims;
there's actually quite a bit of variation between individual specimens.
I was going to build the rear wheel next, but...
The rear hub is 240S Disc, 12/148mm, also BOOST standard.
I need to swap the freebody from Shimano to SRAM XD Drive.
It's a confusing situation, but at DT they call the freebody + right end a
"rotor kit," and of course it has nothing to do with disc rotors.
Swapping the rotor kit from Shimano to SRAM XD Drive—
if you say that without explanation, it's pretty mysterious.
You don't often get the chance to disassemble a brand-new star ratchet hub.
It was helpful to see, as a reference, how much
star ratchet-specific grease was applied from the factory.
I did swap the freebody, but
the right end flange diameter doesn't match.
The 240S Disc hub accommodates 142mm and 148mm widths by swapping end pieces,
and further, parts are available for each width in both Shimano and SRAM XD versions.
But you don't have to buy these ends separately—
they should be included with the rotor kit.
For example, even with the same Shimano freebody, when upgrading from 10-speed to 11-speed,
DT has different right end lengths, so
you need to swap the entire rotor kit (freebody + right end).
The bag the customer gave me didn't have a right end in it.
So today I only got the front wheel built, and the rim's secrets will have to wait for another day.