Problem with LTwoo RX rear derailleur position

[chinapal]

Hello,

I recently finished my first build with an TanTan TT-X34 Frame and an Ltwoo RX hydraulic group set (yeah ). I was able to adjust the shifting to an ok grade but I struggle with the position of the (rear) derailleur cogs. On the low gears the cogs of the derailleur are touching the cassette (see pictures)
The little screw that suppose to change the position of the derailleur ram doesn't have any effect (picture with red arrow).

I feel something is wrong but I don't get it.
Cassette is a SRAM force one.

Any idea how to solve this?

Thanks in advance and best regards!

[SirBikealot]

The little screw that suppose to change the position of the derailleur ram doesn't have any effect (picture with red arrow).

Thats the case because you unscrewed it completly. Screw it inwards until the RD starts movin away from the cassette. A gap around 6-8mm should be the target

[chinapal]

Thanks but I tried that. Screwing it in didn't have any effect. I feel something with how it is installed might be wrong.

[Serge_K]

Very nice frame, very neat! Very nice brakes too! are they the new LTWOO brakes? Where did you get them, did they come with the group you bought from AliX? do you have a link?

For your RD problem, you'll figure it out if you keep at it. There's a book on that, called "the art of motorcycle maintenance". Beautiful book, about banging your head against the wall then finally having a "ah ha" moment. Alternatively, take it to a bike shop. Your problem is bound to be user error, because you're using a brand new road groupset on a road bike with components meant to work with each other, as opposed to doing something weird and exotic using potentially broken second hand parts. So with enough patience and youtube videos, you'll find your error, or bike shop.

[chinapal]

Thank you Serge,
The brakes are zrace, so it is basically this set (but I ordered the brakes separately. Breaks are good and light (there's is a trave velo video on them) l. Bleeding was a bit funny as they have two screws for the oil (for unclear reasons) and non of my adapters out of two kits fitted (browed one in the end from a friend).
https://a.aliexpress.com/_EHwRE1a

[hsaus]

Thanks but I tried that. Screwing it in didn't have any effect. I feel something with how it is installed might be wrong.

Is the B screw pushing against the derailleur hanger? I haven't used the RX mechanical derailleur, but here's a Park Tool video showing a few examples:

https://youtu.be/meUQ-BiFL28?t=105

[chinapal]

Yes, the B screw pushes against the hanger but for some reason the ring where the B Screw is attached moves independent from the rest of the derailleur. So screwing it in moves only the ring. To my understanding the B screw and the rest of the thing should move together.

[Serge_K]

Thank you Serge,
The brakes are zrace, so it is basically this set (but I ordered the brakes separately. Breaks are good and light (there's is a trave velo video on them) l. Bleeding was a bit funny as they have two screws for the oil (for unclear reasons) and non of my adapters out of two kits fitted (browed one in the end from a friend).
https://a.aliexpress.com/_EHwRE1a

Thanks, that's what i thought. Basically as far as i can tell on AliX, the ER9/X / R9/X groups only come w the old brakes, it's only the gravel groupsets that come with the ZRACE / new brake calipers.
Did you measure the weight difference between the calipers that came with the group and the ZRACE you put on? I think it's quite substantial. And importantly, they look much better i think. It's pretty annoying not to be able to get the (E)R9/X with the ZRACE calipers right away.

[Lewis_Stewell]

Yes, the B screw pushes against the hanger but for some reason the ring where the B Screw is attached moves independent from the rest of the derailleur. So screwing it in moves only the ring. To my understanding the B screw and the rest of the thing should move together.

Can you take a closer picture so we can see what's going on with the b-screw?