The good thing here is the fin on the SRAM UDH is plastic so it can easily be filed back to clear the sour dropout. I don’t see what they have done is an issue to be honest.
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Some time ago I got my hands on silca 3d printed ti udhanger, it looked great. Got me thinking why someone just doesn’t make a finless design and share it so everyone in need could simply outsource it? I guess the availability is reassured because 3d printing business is here to stay.
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I currently have that in my model at the moment. I’ve been trying to decide if I do it 3D printed or CNC.
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I think I have solved the doubt
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As a matter of fact, I landed on this very specific thread because I am one of these people who won’t buy a titanium bike because it doesn’t have UDH 
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I didn’t go through all the thread yet, but it’s very interesting.
Basically my reasoning is that - if I’m buying a titanium frame - it’s meant to last for my whole life. Yet if I’m stuck with a proprietairy derailleur hanger, what if it breaks in 10 years from now? What if by then, that piece is nowhere to be found ?
Yes, I could find someone to make it for me. But if the piece is broken and I don’t have the drawing, it’s not going to be easy. Let alone I can find someone who would accept to do it, at a somewhat reasonnable price.
It feels like UDH - although maybe not perfect, according to what I read - guarantees me that I’ll still be able to find derailleur hangers in 20 years from now, even if the builder / frame provider has stopped his activities.
Nothing new I guess, but just a customer’s perspective.
BTW, the only build I found currently is the Sonder Sedona Ti. But the geometry doesn’t suit me and you can barely mount anything on this, so I’ll just wait.
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Check out the revel R+, also any frame that uses Paragon sliding dropouts can use the udh inserts as far as I know. Swapping will raise the rear end and shift the wheel back by 5mm in both directions
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This is a valid fear. I speak to consumers at least twice a week who own a beloved bike which had mis-hap with the hanger. However, the original framebuilder is no longer and there’s no support for the bike. Sometimes the business was only two or three years old 
Thank you @RxDesigns for the shout-out!
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@thomas.gdm Welcome!
For sure, I can see it from the consumer side, you have to buy what is available. Nothing wrong with that. This thread is 1) from the builder/designer perspective, and 2) from more than a year ago. Since then, the horse left the barn, and there is no going back!
This is why I believe companies should release the digital file of their hanger. You can easily 3D print a titanium or aluminum replacement in 2024.
My big fear is that UDH may lead to the bifurcation of drivetrains thanks to the patents surrounding the UDH interface. In 5 years you may see “shimano only” bikes or “SRAM only bikes”. Nothing is guaranteed 20 years from now!
I totally appreciate the customer’s perspective. That is the reason we are offering UDH on our bikes now! We made a big effort to mimize the impact (ugliness) and compatibility (we still build to “boost” 52mm chainline, not 55mm).
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but the direct mount specification isn’t patented. It’s an open use specification. Only the use of the UDH branding is where SRAM want you to sign up to a free licence agreement. That’s my understanding of it. I highly doubt to the point of 99.999999999999% certain Shimano won’t create their own direct mount frame specification. They’ll design around the current Dia. 20x12.7mm hole. It may be via an adapter sleeve where their axle is a smaller diameter, so they have a point of difference to market, but will always be able to go into the SRAM hole.
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Thanks for your responses !
@RxDesigns thanks for the recommendation ! Being based in Belgium - Europe, I was looking for a bike made in my region. But @Coco_PMW you make some pretty bikes, that’s for sure !
Could be, I’m not sufficiently knowledgeable to evaluate. But at least with a UDH compatible dropout, I know that 20 years from now I’ll still be able to supply derailleur hangers.
I read somewhere that SRAM may indeed have been pushing their UDH to force the market to adopt the SRAM hole in the dropout. As a mean to prepare for direct mount derailleurs such as the latest RED XPLR.
BTW, this forum is so interesting. I never actually imagined the complexity of the assembling titanium bikes.
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You’re more than welcome to drop the workshop in Wijchen, the Netherlands and check out our UDH dropouts. These are stainless steel, but a titanium full suspension is being built and we are working on a titanium UDH compatible gravelbike.
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That vertigo frame looks great.
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That’s a very neat solution.
Reminds me of the dropout design shared by @DEVLINCC right at the start of this thread. Worth a re-post I reckon. Seems like plate style UDH dropouts consistently give off a much cleaner look than hooded ones, especially on road/gravel bikes with thinner stays.
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Looks like a flexstay xc build coming up.
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Sounds interesting! Any guestimate on the release date for the titanium gravelbike ?
Early 2025 if all goes to plan, but we can do it faster if someone buys one. 
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