LTWOO ER9 & ERX - Electronic groepsets

[Frankie]

I believe LTwoo and Sensah rivet on their pulley cages so they're non-removable. At best you might be able to get away with 12t and 14t jockey wheels with the stock cage. I use these POM jockey wheels from Fovno with steel bearings on my gravel bike. They spin smooth with no issues even with mud and dirt:

https://www.aliexpress.us/item/3256804850728680.html

After I’ve checked on my rx mechanical derailleur its defenetly a set screw.

[Pedaldancer]

I can unscrew the jockey wheels on my ER9. The jockey wheel is narrow wide so you need to feed the chain right otherwise it doesn't work. I'm not sure it helps with shifting to have that profile. It took me a while to realize that, hence i almost changed the pulley wheel itself before realizing i was just being thick.

I guess the question was about exchanging the complete cage and not the jockey wheels. They should be replacable as they are aging and at some point must be replaced.

[esdrus]

Has anyone found any replacement parts yet, things like hoods for example.

[MccWcc]

My eRX Rear Derailleur stops working during ride. Anybody have a fix?

One hour into ride, rear derailleur “crashed” in gear 12. Derailleur would not come out of 12th gear. There was noise coming from the derailleur, but no movement. Front derailleur kept working.
When I plugged the charger onto the derailleur, nothing changed. It will not come out of 12th gear so I can't recalibrate via the App. Front derailleur still working.

Is there something I can do? Do I need a new rear derailleur?

Thank you for your help!

[Dmgreen13]

Is crash protection on the app on or off?

[MccWcc]

Is crash protection on the app on or off?

Thanks for your feedback. I checked settings in the App and "Gear Protection" was "OFF." I switched it "ON" and nothing changed. The RD still makes a movement sound, but no movement. The App thinks it is in gear 10. when I try to switch up or down, the App jumps to the gear, but then switches back to gear 10 when the RD motor stops.

[MccWcc]

Do you have the version of the battery that holds batteries with tabs or springs? It's been established that the tabs version led to problems, vs i'm unaware of problems with the springs version. I would start there, because if you have the tabs version, contact LTWOO and get a springs version. The battery housing weighs nothing so shipping it to you should be super cheap for them. And in the meantime, you can add shims to increase the pressure / tension on the system.

It is unlikely that any of your group is broken, stuff typically doesnt randomly breaks just like that, especially when it's new and you weren't doing anything weird with it.

Thanks Serge_K. I have the battery with the springs version insert. I hope you are right, and nothing is broken. I am trying to exercise warranty through "LTWOO Official Store" on Aliexpress, but so far no luck.

[Sebastian]

I've installed 5 ER9 groups in the last 2 weeks. 1 gave me issues for some reason, but it was my fault. Make sure the limit screws are set properly, as well as the 3rd screw that sets the tension on the cage. The RD protects itself very quickly, so if any of the 3 screws are off, the cage wont shift. It's given me a new appreciation for my own incompetence and the fact that stuff usually works as long as it's installed and setup properly. During the builds i'm often thinking "this is such POS" but then an hour later, or a week later, i realize it's just me being incompetent / thick / tired.
Did you unplug and reset? battery's charged?
If you remove the wheel, does the RD shift? Are both FD & RD running the latest firmwares?

I second that. I've found that as soon as the RD's motor will experience excessive vibration or resistance it will stop shifting and/or shift back to it's original position. For instance, it avoided the big big chainring/casette sprocket combo when I had the RD's upper pulley set up too close to the cassette. It didn't touch. But the vibrations alone caused it to immediately shift back as soon as it went into that gear. A short tweak of the b-screw and the issue stopped.

[boxof13]

Has anyone found any replacement parts yet, things like hoods for example.

80 Designer Store has now put an eR9 RD listing. I am guessing we will start to see more replacement parts listed up on AliExpress.

https://www.aliexpress.us/item/3256806373886040.html

edit: They also already had cables, battery holder/box and charger listed for quite a while.

[jonathanf2]

If using the silicone grease method to protect the RD cable, has the ER9/ERX groupset gone through enough manufacturing revisions to be recommended (by users on here)? It looks like most of the kinks have been ironed out and if the silicone grease does indeed enhance weather protection, one could just buy a backup battery/cable set off 80 Design Store for $20 USD and the rest of the components should be solid.

[neobiker]

What about the heat shrink tubes? They are waterproof and they sure protect from water entering the RD?

[zerstorer]

The cable plugs into a slight indent. I don't think there's enough space for shrink wrap to work properly.

I coat liquid electrical tape around the indent to form a waterproof seal and it's been solid.

[Dmgreen13]

My eRX Rear Derailleur stops working during ride. Anybody have a fix?

One hour into ride, rear derailleur “crashed” in gear 12. Derailleur would not come out of 12th gear. There was noise coming from the derailleur, but no movement. Front derailleur kept working.
When I plugged the charger onto the derailleur, nothing changed. It will not come out of 12th gear so I can't recalibrate via the App. Front derailleur still working.

Is there something I can do? Do I need a new rear derailleur?

Thank you for your help!

Did you work this out?

[TidyDinosaur]

Because i'm intellectually challenged, i went for a ride and the battery of the er9 died on me. Folks, don't forget to charge your group regularly, please be smarter than me
I am not using the original l-twoo batteries because of problems with shipping lithium internationally, so i bought what i found, and the capacity of the cells i found is SHIT. Therefore, i think i can get 500km autonomy or so. This is, afaik, the lithium's fault, not l-twoo's fault. Charge your group very regularly, it's quick to do, but no juicy, no sexy. Was a flat ride, was ok. In the mountains, it would have sucked hard.

Does anyone know if there's a garmin data field with the battery indicator of the er9/erx group?

Try https://www.nkon.nl/ for batteries

[boxof13]

Because i'm intellectually challenged, i went for a ride and the battery of the er9 died on me. Folks, don't forget to charge your group regularly, please be smarter than me
I am not using the original l-twoo batteries because of problems with shipping lithium internationally, so i bought what i found, and the capacity of the cells i found is SHIT. Therefore, i think i can get 500km autonomy or so. This is, afaik, the lithium's fault, not l-twoo's fault. Charge your group very regularly, it's quick to do, but no juicy, no sexy. Was a flat ride, was ok. In the mountains, it would have sucked hard.

Does anyone know if there's a garmin data field with the battery indicator of the er9/erx group?

It happens to the best of us! I now carry the USB charger cable with a USB C to A converter, so I can quickly top up just enough to get me home/anywhere to stop and charge using only my phone. Both the cable and USB converter are so compact I can easily shove them in my saddle bag.