LTWOO ER9 & ERX - Electronic groepsets

[jonathanf2]

Warranty issues aside how are the details on the groupset? did they copy old shimano mistakes like plastic threads on bleed port, flathead brake pad pin, random useless sharp bit in the caliper etc
and is it possible to buy electronic ltwoo with the zrace/iiipro calipers like it is for the mechanical version?

LTwoo brake calipers are actually pretty decent. I use them on my Ultegra build bike. Only issue is that I had to manually adjust brake pad spacing (removed the pads) by squeezing the levers several times to get the pistons closer. I think this was an issue with earlier calipers, because my newer ER9 calipers don't need much lever pull.

The Zrace calipers, while being less weight are more cheaply made. On the pair I was using, the pistons can actually fall out if too much pressure is applied without a brake block. Let's just say I had to clean up a big mess.

[kbernstein]

The Zrace calipers, while being less weight are more cheaply made. On the pair I was using, the pistons can actually fall out if too much pressure is applied without a brake block. Let's just say I had to clean up a big mess.

Had this happen with shimano... Costly mistake lol. Brought it to a shop and they said shimano specifically asks to not service them in those cases so I had to buy a new one, thankfully of newer generation which is infinitely better made than the old gen sack of shit caliper

[max_the_rider]

Hello folks,

I do have a doubt about my er9 groupset...

It works perfectly when connected to the charging cable (via the app and sync with the levers), but as soon as I plug it out, nothing happens... No green light on the rear derailleur...

I guess it's not normal but hum...?!

[SirBikealot]

Hello folks,

I do have a doubt about my er9 groupset...

It works perfectly when connected to the charging cable (via the app and sync with the levers), but as soon as I plug it out, nothing happens... No green light on the rear derailleur...

I guess it's not normal but hum...?!

had quite the same problem yesterday. Try holding the RD button when attached to the charging calbe. The RD jumped into the smallest cog and worked fine since. This should be some kind of factory reset, if i understood right.

[jonathanf2]

I've been abusing my ER9 all week with fast flats, long climbs and sketchy road descents. I'm definitely using the full range of my shifting. I hop curbs and take my bike on dirt roads, something my mechanical setup could easily handle. I also fixed my mis-shift issues on the 3 big cogs, now it's shifting perfectly.

On occasion I have to press the RD button to link up to the app as opposed to just shaking the bike to have it connect. Besides that everything is working fine. I'll definitely chime in if I have any issues. Not doing any rain rides though!

[zerstorer]

Hello folks,

I do have a doubt about my er9 groupset...

It works perfectly when connected to the charging cable (via the app and sync with the levers), but as soon as I plug it out, nothing happens... No green light on the rear derailleur...

I guess it's not normal but hum...?!

Check the batteries/connection?

Can you see the battery status when power cable is connected?

[jonathanf2]

That is a reset indeed. When it's not broken, you can then shift again normally, but you probably have to recalibrate the gears with the app (which, the more you do it, the quicker you get).
But if your RD is F'ed like 2 of mine, then it makes weird noises, and refuses to shift.
Trying to hear back from Ltwoo via the chinese intermediary that sold me the groups, and so far i m getting nowhere.

Have you tried contacting LTwoo directly?

https://www.ltwoo.com/foot/Contact_us/Contact_us

[Jonty12]

Quick Q, Does eRX have a button that can control the head unit screen like Di2 (Ultegra+) has? 

To clarify, with Ultegra and DA Di2, there are buttons on top of the hoods that can be programmed to page up/down on your head-unit.

[toxin]

No

[Serge_K]

Have you tried contacting LTwoo directly?

https://www.ltwoo.com/foot/Contact_us/Contact_us

The support / ticket page i saw said to go via your reseller first, so i did. if i understand him correctly (his English is conveniently dubious at critical times), ltwoo is sending him 2 replacements and then he'll have to ship them to me. I'm not sure i understood correctly, it's happening in real time and he's bad at answering emails and gets upset when i chase him. There hasn't been any feedback on what the problem may be / is. If they are sending replacements i guess they're just broken? I would have wished there would be a software / reset solution to it, because it means 2 RDs just randomly died under normal use.
I have extremely mixed feelings about RD randomly dying for no reason, imagine a cycling holiday, a bike tour, or a long day out, how F'ed you are if that happens...

[jonathanf2]

I have extremely mixed feelings about RD randomly dying for no reason, imagine a cycling holiday, a bike tour, or a long day out, how F'ed you are if that happens...

It's definitely concerning to hear about the ER9/X RDs just dying. By any chance do you have a bar code on your RD? Joe from China Cycling said it should say the manufacturing date. Reading the first 6 digits, mine says 250123. If that's dd/mm/yy, that means I have an RD from early last year. 

I'm not sure I would take the ER9 groupset as my travel bike either. Luckily I have other mechanical bikes for travel. I'm just wondering if there's a way we can narrow down the problematic groupsets or if they're all ticking time bombs! 

[coffeebreak]

Don't know if I should feel happy or sad. My second purchase of the ER9 has been sent back to seller because of the batteries. This is after I sent message to seller (for once they replied) and confirmed if its without batteries. Then I placed the order and sent them order number. No dice. They included battery and pretty much immediately was back in their hands. Now reading these reports, may be it was for the better.

[Finkster]

It's definitely concerning to hear about the ER9/X RDs just dying. By any chance do you have a bar code on your RD? Joe from China Cycling said it should say the manufacturing date. Reading the first 6 digits, mine says 250123. If that's dd/mm/yy, that means I have an RD from early last year. 

I'm not sure I would take the ER9 groupset as my travel bike either. Luckily I have other mechanical bikes for travel. I'm just wondering if there's a way we can narrow down the problematic groupsets or if they're all ticking time bombs! 

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.

[max_the_rider]

Hello folks,

I do have a doubt about my er9 groupset...

It works perfectly when connected to the charging cable (via the app and sync with the levers), but as soon as I plug it out, nothing happens... No green light on the rear derailleur...

I guess it's not normal but hum...?!

I might have solved my problems... But... Don't ask me how, I don't really know... Plug out/plug in batteries, long press on RD, reset, fine tuning and that's it!

[Pedaldancer]

I have access to 4 of the 5 now (2 broken, 1 on my road bike that's working and 1 that's not broken but on a bike with a broken wheel & a trashed RD hanger, so not seeing any use for several weeks already):
Broken: 250123
Broken: 250123
Working: 250123
Working: 250123
...
Maybe more interestingly full numbers 250123XXXX0119 / 123 / 122 / 133.  I blanked out the middle, idk if it's sensitive or not to share the serial #.

You are in the EU? I am familiar with the physical analysis of broken electronic units.
I can't of curse guarantee anything, but if this failure is due to a water ingress or internal dewing event there should be visible traces on the printed board. Sometimes it's also possible to see bad solder joints.
Internal damages of components unfortunately very often do not show any signs of something which can be seen visually. Sometimes they show discoloration on pins or melted housing but that's not always the case.
This analysis is very often destructive,. But .. its already dead, right?