Internally routing or Hiding Di2

Does it go down the steerer and then through the lug at the crown?

That's exactly what I did. The crown is hollow from the factory, giving me all the room to get the brake hose through there.

@Kimmo I don't have any pictures of it, but I brazed in some reinforcements on the inside. The reason I went this route is because of the 34-44 tapered steerer which lacks the room for "normal" holes in a steerer.

Not sure whats going on here, 44m headtube and normal stem/headset yet still hidden. Must be custom fork with a sneaky hole somewhere?

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found it, sneaky massive hole in steerer.

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https://stelbel.it/en/stelbel-sb-03-evoluzione/
:)
i assume there is another hole at the downtube level for the cable to exit ?

yeah must be, unless they have the forks produced at a range of steerer lengths but that seems like a faff. The hole seems bigger than necessary tho

it does seem large but i imagine it allows some spare length of cable to prevent snagging if the bars overotate

I figured it was so the hose could enter the steerer from inside the stem and then exit the steerer under the headset bearing out of the same hole.
It's a milled slot in the fork

thats what i was thinking, but then they need to prefab/stock a bunch of forks with different steerer lenghts? seems like such a pain

to mill a hole, insert/glue a precut reinforced carbon sleeve, is that really unsustainably time-consuming for them ?

Nah it's cut and milled to length. They're all full custom builds no?

i assume(d) there is more going on than just cutting the hole.

I'm pretty sure it's just as @glws says.
They get steerer length from customer's drawings/bike fit, chop it, mill a slot in it Xmm from the end of the steerer, bond in some special reinforcing/headset preloading gizmo, job done.

it's pretty smart, i am almost sure an lfgss group order of carbon inserts + columbus forks could be conceivable

That top insert is what doesn't make sense to me. With a Chris King top cap on it, the stem top pinch bolt must be pinching air right?

Did it again :)

My latest project has internal hydraulic lines through the drop bars, stem, steerer tube, fork, down tube, BB shell and chainstay. Also routed the di2 wires through the chainstay, but that's easy with the new DA 12s. Here are some pics again:

Drilled/Dremeled a stem exit for 2 hydraulic lines.

Drilled an entry into the steerer, had to pull the hose through the headset in this awful bend...

Made an aluminium insert for the top of the steerer for mounting the top cap and allowing the hoses to route towards the stem and epoxied it in place.

Mounted the stem and pulled the hoses through.

Routed the hoses through the bars and installed decouplers underneath the tops for when I have to remove the bars.

And this is the end result :)

That seat tube is doing some heavy lifting there

Good work though. Very helpful

very nice. what tires are those ?

Thanks!

@schnizi, Ultradynamico Cava Race. They actually measure 36~37mm on these rims.

Even putting your integration work to the side, that is rad AF.

Yeah, not too shabby at all.

Makes me feel less nervous about the 2.5mm holes I put in my steerer...

do those hydro decouplers work well?

I love the look of those tires! :-)

What's your take on them? Do you like them?
How durable/puncture prone have they been?
I couldn't find a lot of (any) info/real world experience about them.

PS: bike looks really good also!

Those tyres feel really fast and grippy. But my rear tyre hasn't kept air for more than 3 days, both tubed and tubeless... So no not really durable/puncture proof.

I'm thinking of replacing them with Challenge Stradas or something similar, but these just look so good and are incredibly light.

Thanks!

@swedeee, yeah great. Easy to decouple. A bit finicky to couple again, but if you get used to them they're fine. And zero leaks. I do recommend them and I'm planning on using them in all my builds.

Which quick couplers did you use? I looked into this briefly, but could not find any before I booked my build.