LTWOO ER9 & ERX - Electronic groepsets

[Benbenben]

I have two ER9 sets, one with the RD phantom batt drain fault that I described a few pages back.  Both have serial numbers starting with 250123.  First set was bought in Nov 2023, second in Feb 2024.  More likely that these numbers are just product codes identifying it is an ER9 RD with the following numbers the actual serial number.  Unless someone actually owns an ER9 RD that has different first six numbers.

I'm hesitating installing the 2nd ER9 set on my gravel tourer due to reliability concerns.  When riding on the road near home in relatively good conditions, its not a big deal, but in a foreign country with limited access to LTWOO ERX/ER9 parts, its a big risk unless you carry a spare ER9 RD around on your travels.  With SRAM and Shimano, almost every decent bike shop will be able to provide the needed parts in a jiffy.

I have a ER9 and RD code starts with 250124

[Sebastian]

My RD's serial number starts with 250123 as well. Bought in Sept 23.
No issues yet apart from one ride with intermittent shifting due to humidity in the plug. Without issues since I weatherproofed the connection.
I've done roughly 3000km and 16.000 shifts with it. Fingers crossed.

I did shy away from using the bike in a race recently due to the number of reports here. I didn't want to be stranded on the side of the road with non working derailleurs, so I used my mechanical bike. But I've done 6+ hour long gran fondos with this and used the battery with as little as around 25% of its capacity. It kept working. I also regularly ride cobbled and dirt roads on my rides and the vibrations have not been a problem so far.

[Avalius]

Mine is working fine so far, damn I really hope that it just doesn't die in the middle of a race here. But if it happens oh well bad luck than lol

I'm selling an eGR group in Belgium. Don't wonna take the risk on the gravel since I'm mostly far from home when riding gravel.
Asking the price i've paid for it, if it doesn't sell I'll try it anyway.

[jonathanf2]

I have a ER9 and RD code starts with 250124

Curious which seller you bought your ER9 groupset from? Also report back if you have any issues. If the 250124 is a newer batch with silent revisions, perhaps those are the groupsets to buy?

I somewhat have this love/distrust with the ER9. Now that my ER9 is setup properly, functionality-wise it's been running great. The way I can hammer the shifts on the fly is awesome in conjunction with a close ratio 12 speed cassette, finely tuned cog spacing and gear protection helps so I can just focus on my cadence. I rode my mechanical Ultegra the other day and totally forgot I had no gear protection (shifted into big/big) and I was wondering why my computer wasn't seeing the shifters? Lol

Only if LTwoo weren't such dumba**es and put a bit more effort in refining their product. They could literally sweep the market if the ER9/X was far more reliable. All these user reports of failing RDs and lack of support just undermines a potentially good product. Hell, I'd pay $100 USD extra if they could improve their quality assurance and customer support. The fact I can use 7-13 speed cassettes and use run-of-the-mill rechargeable batteries is enough for me to pay extra.

[Finkster]

So it seems more likely that 250123 and 250124 are batch numbers.  I'll have a replacement RD coming in a week or so.  We'll see what numbers this one has.

[Pedaldancer]

Yes i'm either in France or Romania. after i get the replacements, let's chat. I may open one myself to see if there's something obvious, i could maybe send you one if you're curious to play around. It would be interesting to figure out what happened.
Either way, neither died because of water or humidity. One died after a descent on bad asphalt with teeth rattling vibration, the other one just died at the very start of the ride, but we're not in humid climate or season so can't be condensation.

  sometimes the damages are a weirdo combination of several things. Yes, I agree , your description doesn't sound like water at the first space. I am super curious, last year i opened a failed Shimano front derailleur and I could figure out the damage.. purely mechanic damage, the electronic part was super fine. I didn't expect that frankly... I am open for that experiment, let's just chat then 

[Avalius]

My set that I received a month ago is 250140. Didn't receive my electrical tape yet and did a few pouring rain rides already.
Fingers crossed.

[jonathanf2]

My set that I received a month ago is 250140. Didn't receive my electrical tape yet and did a few pouring rain rides already.
Fingers crossed.

Okay, so 250123 batches seem to be problematic. 250124 and 250140 could be newer batch runs. Maybe all the deep sales are for the older 250123 batches? What seller did you buy yours from?

[Finkster]

Looks like my first ER9 set is a lemon.  After the RD gave me batt drain issues, the right brake lever also has a fault.  When pulling the brake lever, at first it travels normally, hits the wall of resistance when the caliper pistons move and brake pads press against the rotor (normal so far).  But when more force is applied, a loud clunk comes from the hinge area of the brake lever/shifter, and there is no further force generated by the hydraulics to squeeze harder on the rotor.  So essentially, the rear brake doesn't work no matter how hard I pull on the lever.  There is felt resistance at the lever, but it feels like something gave way internally of the lever and no fluid is moved from that point.  There are no fluid leaks to be seen anywhere.

So to troubleshoot, yet again I had to rob parts from my 2nd ER9 set, installed the right shifter and it totally works fine.  No more brake issues.

Contacted 80's designer again to request for a replacement and awaiting their response.  Meanwhile I'll try to dissect the lever and see what's wrong if possible.

[Avalius]

Okay, so 250123 batches seem to be problematic. 250124 and 250140 could be newer batch runs. Maybe all the deep sales are for the older 250123 batches? What seller did you buy yours from?

80 Designer store here on Ali.

Contacted 80's designer again to request for a replacement and awaiting their response.  Meanwhile I'll try to dissect the lever and see what's wrong if possible.

Atleast this looks like a seller that's handling issues. :s

[amacal1]

I just received an eGR 1x setup. I have a 220124 date code, so let's hope it's in better shape.

Does anyone have both an eRX/eR9 as well as an eGR? Can anyone comment if any of the parts are interchangeable? (i.e using an eGR RD with an eR9 FD,or using eR9 shifters with eGR derailleur, etc.)

[SirBikealot]

Has anyone tried this set for bleeding.
It's SRAM specific but should work for the calipers?
https://aliexpress.com/item/1005001317203067.html

[SirBikealot]

Just came back from my first ride.
Was super happy with the ER9. Nice shifting (some small adjustments have to be done to be spot on) until i tried to shift both derailleurs at the same time.
Front from big to small and back vice versa. Ended up in a half shifted gear and a complete dead groupset.
Has anyone had this problem before? And is there a hack to bring it back to life without attaching the charging cable?

[jonathanf2]

Have you tried doing a long hard press on the RD button? Also have you double checked all your battery cables to make sure they aren't loose? Mine are all rubber cemented on the derailleurs and then coated with dielectric grease. Were your batteries charged? I would definitely check all connectors to make sure they are firmly attached.

[SirBikealot]

Have you tried doing a long hard press on the RD button? Also have you double checked all your battery cables to make sure they aren't loose? Mine are all rubber cemented on the derailleurs and then coated with dielectric grease. Were your batteries charged? I would definitely check all connectors to make sure they are firmly attached.

yes.
yes even unplugged every cable even removed the cables from the battery pack.
and yes everything is charged.
just a small connecting to an external power source and tada everything was back to normal