I want to buy new brake pads for the er9. Considering experimenting with different compounds.
What are the pads that are compatible with the L-TWOO calipers? I doubt the fins matter.

These work well. I use them on my GRX gravel bike with no issues on off-road downhill. They're a resin/ceramic mix. I think they brake better than the stock LTwoo eggroll pads.

https://www.aliexpress.us/item/3256804993304535.html

I just want to report some oddities between my 2 separate ER9 setups. Each groupset was purchased from different vendors on AliEx. My 1st ER9 is running FW 1.1 on the RD and FW 1.2 on the FD. My 2nd ER9 is running FW 1.1 on the RD and FW 0.0 on the FD. I'm not sure why the FW between the two groupsets would be different, perhaps there are some internal hardware differences? Also for some strange reason, the 2nd ER9 groupset doesn't seem to show any battery drain. I'm not sure if it has something to do with the batteries or the RD isn't transmitting charge data? Also I was initially covering the power connection port on both ER9 RDs with electrical tape (as a means of weather protection). Though on the 2nd ER9 groupset, doing so interfered with the bluetooth connection to the shifters. The moment I removed the tape, the shifters were able to reconnect.

I'll update any other issues that arise!

I've installed 2 replacements and these have been working fine, but that's on under 500km together.
the worst thing in all this is the behaviour of ltwoo. a beta product with a ghosting manufacturer is just bad news.

Since you have access to other ER9 groupsets, have you tried other cables and battery holders to narrow down the issue to the RD being completely dead?

At this point why not just order a spare ER9 RD? With the coupon deals right now, it'll probably be under $130 USD. Time is money, I'd rather be back on the bike.

https://www.aliexpress.us/item/3256806937165249.html

I ended up installing a spare ER9 groupset on my older SPCycle SP-027D frameset. Despite having a few quirks with my first ER9 bike, I think I've ironed out most potential issues. I was planning to save the groupset for a future bike build, but there's not much that interest me right now.  Plus I think semi ICR bikes running electronic are as hassle-free as it gets when it comes to maintenance and travel (my headset is solid like a rock).

This bike was easy to convert to electronic compared to my ER9 TFSA frameset. There was ample space to route the cables and battery holder. Only issue I had was getting my shifters installed properly on new 38cm flared drop bars. LTwoo has the most convoluted shift clamp screw. I also swapped in a new set of EBL brand 2x14500 batteries. They seem to be working well on my other ER9 bike, compared to the Skywolfe batteries I was using previously (both purchased off US EBay).

One strange thing is the ER9 FD on this frame hasn't asked for a firmware update. This ER9 FD is running ver 0.0, while my other ER9 frame is on ver 1.2 I believe. Also I'm running 11 speed 52-36t/11-32t on this frame, while my other frame is running 12 speed 50-34t/11-34t. When set to 11 speed, the fine tuning values were way off. I found it really strange, though I was able to adjust it properly. I also have a chain catcher on order, I don't trust non-Shimano FDs to be chain-drop free.

Anyways, I'll report back once I get a few kilometric miles on the groupset. We'll see if my bike implodes with all the shifty AliEx components I'm running! 

Every time I read the new posts in this thread, I am so happy I became a Wheeltop EDS OX and TX user.   

Hey, but now we have the first report of Wheeltop TX PCB corrosion! 

I think all these electronic groupsets have certain compromises, even Di2 and AXS. It really just depends on what's acceptable for the end user. Though I'm still interested in what Wheeltop is doing. Hopefully prices will start to drop in coming months, especially once Magene comes out with their electronic groupset.

From the vendor reply:

SC-R55D frame + fork + seatpost: US$665/set
SC-RH02 integrated road handlebar: US$150/pcs
NO.55R Headset: US$30/set
Thru axles: US$20/set
Shipping cost: US$120

The current lead times are 2~3 months.

Nice looking frame though. It looks to be both somewhat aero, lightweight and stiff. A potentially good all-arounder.

I honestly can not imagine why anyone in their right mind is still buying these groupsets now... The failure rate is so enormous and the aftersale service is so horrible...
The low price is just not worth getting stuck somewhere (and the question seems to be when and not if this will happen) without any chance of repairing the groupset on the road...

I'd still buy the ER9/X over again even with the minor issues I've had. I've been able to figure out all my problems. Plus spare parts replacement for Di2/SRAM are still more expensive. If any major issues are going to occur, it'll be the RD. Protect the ports, get good batteries and make sure not to damage the cables. At least up to this point, ER9/X replacements parts are available and for reasonable prices.

Hi all, I'm considering purchasing either the Erx or the Er9 from ltwoo for a new build, but there are few points on which I'd like to ask about your experience:

1) indexing of the gear: from what I can read on the forum and bits and pieces of information from Ltwoo on AliExpress (I could not find a comprehensive description of the groupset) the indexing is done via the partner app. Is there a way to use and index the group without the need to install any app?
Can you press a combination of buttons on the levers that will put the group into a "indexing mode" where you can go through each cogs and do micro adjustments just by clicking on the buttons and then memorizing that specific configuration or the app is the only way to go? (Opposite to what is possible with Shimano ).
My concern is that if in the near future the app becomes unusable (lack of support, new OS version of iOS or Android that do not supper and old app) I will be be left with an electronic for upset that I cannot index anymore

If that's a concern, then I wouldn't even consider an electronic groupset. That's probably why most bike tourers stick to mechanical + steel frame bikes for ease of maintenance. It's not like 10 speed Di2 is still properly supported. Plus you could always put the Ltwoo app on an old device/ipad/tablet dedicated to tuning the groupset.

I have no particular bias with electronic vs mechanical. They both work. At this point either 105 or Ultegra mechanical are the best bang-for-buck groupsets available right now.

I'm a bit bummed there aren't more options for 11/10-36t cassettes in both 11/12 speed. I'm not too fond of mixed steel/alloy cassettes. They do have an all steel 10-36t cassette for 11 speed, but not for 12 speed.

https://www.aliexpress.us/item/3256805833912725.html