Is this available via firmware update?

I just got called a racist by LT-Ray because I criticized the fact that they keep changing their groupsets. A few months ago I started saving to build a gravel frame and I was interested in building a 2X using eRX eGR mix. Ray sent me a video of the then current wired EGR rear derailleur working perfectly with their wireless MTB Shifters and with eRX Shifters. I was impressed.

Fast forward to today (6 months) and I am ready to buy the parts for the bike as I have saved enough money. I can't do what I wanted because wired EGR isn't a thing anymore and their wireless rear derailleur isn't compatible with the existing semi-wireless parts.

So I criticized them. I said that it shows there is no long term support for the products because if I purchase a part only for it to be discontinued a few months down the line. How am I supposed to get spares? I keep bikes for many years not for months at a time. I want to know a groupset that I am purchasing will be supported long term.

He went off at me! I got told I am not showing respect and that I am having bad attitude. Man respect is earned. You don't just get it for free. A customer is allowed to criticize and voice their dissatisfaction. Nope apparently I'm just a racist.

I guess I won't be buying anything from Ltwoo in the future ever.

Quote from: jonathanf2 on February 27, 2026, 11:38:46 AM
Batteries probably still need a proper charge. I'd just get an external charger and try charging them that way. I notice with ER9/X if the battery power is below a certain point after being idle for awhile, they need external charging.

looks like I fixed it.

I applied dielectric grease to all the connectors in an attempt to further protect against water ingress. At the battery end and at the Derailleur ends. I think applied the grease a bit too generously and it was causing a poor connection. After cleaning the grease off I completed a 3 hour ride yesterday without further failure.

Can I have some help with my ERX V3.


I was off the bike for two months and the bike with eRX sat idle for a bit. Now that I am riding again I am having issues.
It keeps stopping working mid ride. As if the battery is flat. I can't wake the system up without plugging in the front derailleur to power.
I checked the charge. The app says it's 100%. The light stays solid green on the front mech when charging.
My shifters show green when I press the buttons so the charge in those is still good.

Whats going on?

I see there are new brake calipers? Are they lighter than the V3 calipers? No longer need funny adaptor plates?

Then I have a V3 groupset. My rear derailleur model number is RD-ER1201. I see there are now RD-ER1203s. With both regular and OSPWs. What's the difference between 1201 and 1203?

Hey guys. Can't remember if I have asked this before.

But is it possible to mix and match the Ltwoo ekectronic groupset parts?

Ltwoo doesn't have a 2X gravel groupset. But I want 2X.

Can I use eGR rear derailleur with eR9 shifters and battery and stuff?

Quote from: jonathanf2 on August 18, 2025, 11:24:45 AM
Where'd you buy the groupset from? LTwoo confirmed they're a straight up direct-to-business supplier. So you'll have to get warranty support from whichever vendor you bought it from. Also new pistons and seals are like $10 USD or less and it's an easy fix.

direct from them. I had LT-ray's contact information so I just got organised it through him. But it seems posting a negative review as a local pro in your country gets them to move the needle a bit. I send the link of my review to Lt-ray and now suddenly I have a Caliper on its way to me.  go figure

Quote from: jonathanf2 on August 17, 2025, 04:54:24 PM
Try replacing the seal and piston. In general I don't have any issues with LTwoo calipers. I detailed the piston replacement procedure on the maintenance sub-forum. It could just be a bad seal. Also this problem isn't isolated to LTwoo, same issue happened with my GRX caliper prompting me to look at alternative fixes.

https://chinertown.com/index.php/topic,6262.0.html

I can fix it. That's not the problem. My problem is I bought a product with a warranty. And if something is faulty I expect it to be fixed in accordance with said warranty. I don't expect the manufacturer to play the blame game and deny my support request.

If Chinese manufactures want to be taken seriously on a global level they can't keep falling into same stereotypical "good luck with Chinese support" pitfalls

So I spoke to Ltwoo about my leaking brake calipers. Specifically Lt-ray.

And they have basically for all intents and purposes told me where I can stick it. They will not warranty my brakes. Very poor form from. LTWOO. 

Found it.

My brakes are leaking from the pistons.

Well I am seriously confused as to what is going on with my brakes. I've been bleeding the rear for over an hour pumping the lever and bubbles just keep coming out. I am convinced I have leaks in the system somewhere but I am seeing no signs of oil leakage anywhere around the levers or caliper.

Ive moved to the front brake and opened the reservoir and it was almost dry in there as well. But I still had some braking on the front of my bike.

I'm currently using Casterol LHM Plus as brake fluid. It's a mineral oil that I have used for a long time with great success on my MTBs. Is this fluid too thin that it's just pressing out somewhere or something.?

Anyone having issues with their brakes getting air in them or something?

I have had to bleed my rear brake twice now in the four months I've had my eRX. Specifically the rear.

I pull the lever till it bottoms out and there is just no brakes. Any ideas why this would happen?

So has anyone connected their eRX to their head units. I've connected mine to my Sigma Rox 11.1 and I'm guessing the rox doesn't quite understand what the eRX is or the eRX doesn't quite know what the rox is.

It connects. It displays gears, but when checking battery it just says 0%. And it often disconnects and reconnects.

Quote from: boxof13 on March 12, 2025, 09:54:52 AM
So, I took the new v3 eRX for a spin the other day. I certainly appreciate the improved ergonomic of the new shifters. The button click feels better somehow—it's like you need that extra push to make sure it actually shifts, which means no more second-guessing if you pressed it right. As for the shifting speed, I can't really say it's any faster because my old eR9s were already pretty quick.

One thing I that find odd is the choice of not allowing power delivery using USB-C to USB-C cable. You can only charge the FD using USB-A to USB-C cable. I assume this is to avoid charging higher voltage!? I tried bunch of cables and pretty much confirmed this. Not a deal breaker, but it would be a bummer to look for the right cable to charge the set.

do you find your v3 levers rattle a bit over bumpy terrain? I'm finding mine a bit rattly and I am looking for hacks or solutions if anyone has.

Maybe the secret sauce is in the Shimano chainrings. Because I am still using my R8000 crank after my conversion to eRX (v3) from R8000 mechanical and I find the front shifting to be at least as good or better. That being said I'm VERY particular about tuning my front mech and my R8000 was tuned very well.