hello. good hint maybe check spacers again? and if the lock ring is tightend sufficently with the given torque (i think 40 Nm)?

I’ve just tried that, but the cassette was correctly installed and it didn’t change anything unfortunately :/

This is my rear derailleur, I’m wondering if my UDH from LightCarbon is correctly installed ?

I have the same setup and haven't had anything you'd describe. What did happen was the bolt that holds the whole crankset together became undone which obviously affects the front mech and shifting. even then everything ran smooth on the rear cassette. could it be that your chain is too long and in the smallest cogs you lose derailleur tension?

Did you use the bolts that come with the Magene p515 or did you keep the default ultegra chainring bolts ?

Also did you use any spacers ?

Yes you should check it, maybe by putting the bike on a stand and slowly rotating the wheel to see whether the chain “meshes” properly with the gears of the cassette or the rear derailleur, and if needed index it correctly. I had the same problem with the ZTTO cassette https://it.aliexpress.com/item/1005007857322027.html, now solved.

I know nothing about Magene. See if they have a different offset- Q factor to shimano.
chordal action - dunno, you have the bike in front of you, so only you can tell.

As a basic step, I assume you degreased the factory goo from the chain ?

Yes, that's exactly what I did, I put it on a workstand and indexed it properly. I really think it's chordal action, but I'd be surprised if I'm the only one experiencing this with this specific setup.
The derailleur and the cassette are well aligned. When the chain runs, it goes smoothly from the chainring —> derailleur —> cassette without any weird rubbing or anything. Where it actually rubs is at the exit of the cassette, when the chain returns to the chainring: that's why I suspect chordal action.
Because of this, I'd like to know if it's dangerous to add spacers, considering my crankset currently has absolutely zero left/right play without them.

Hi everyone,

Is anyone running an LCR018-D frame with an Ultegra 12v (R8100) groupset?
I’m getting  vibrations (rumbling) when pedaling under tension on the smallest cogs. It’s also especially noticeable on my direct-drive trainer.

My drivetrain is brand new and perfectly indexed. Has anyone noticed a similar resonance or chainline issue with this specific frame combo, or is it just my setup?

Thanks!

Hello!

I received my X2 Max yesterday, but I have a question: the further I shift towards the smallest cog (the one on the outside, the 'hardest' gear), the more I feel my bike vibrating/rumbling. Is this something you’ve experienced as well? (I'm running a 2x12 speed setup).

For now, I’ve enabled virtual shifting on Zwift and I'm staying in the middle of my cassette to avoid it, but I’m not sure if I’m just being paranoid. When I say 'vibrating,' it’s quite noticeable, I can really feel it in my feet.

Thanks!

Saddle Clamp angle slipping issue....

For some reason I'm getting continuous slipping of the saddle angle, and when the LC SD01 saddle slides back on the 15mm offset seat post, it makes it very difficult to get a hex wrench in there without damaging the seatpost paint and carbon.

Perhaps I am doing something wrong.  I did not use carbon paste and have read that it should not be used here.   I have not used any grease either.

The seatpost itself is not slipping down the frame, and the saddle clamp is not sliding on the saddle rails.   
It's the saddle angle that is sliding and moving it backwards which is also reducing the space between the hex head and the seat post. 

When it slides, it also tightens up the bolt to the point where I am stripping the head to loosen.  I am using Park Tool hex wrenches FWIW (just noting that low quality tools are not being used).

Have others experienced this and if so, how did you resolve it?

I have the same issue, what seems to have worked was screwing with a little bit more force…