LTWOO ER9 & ERX - Electronic groepsets

[mrpercussive]

So I went and impulse bought some Zrace XG calipers for my Ltwoo ER9 groupset. Was wondering since the pistons are both 22mm but the Ltwoo ones are ceramic and Zrace is aluminum... has anyone here swapped them to see if they're interchangeable? Lol

[jonathanf2]

So I went and impulse bought some Zrace XG calipers for my Ltwoo ER9 groupset. Was wondering since the pistons are both 22mm but the Ltwoo ones are ceramic and Zrace is aluminum... has anyone here swapped them to see if they're interchangeable? Lol

I switched back to GRX calipers mainly because I found the XG pistons tend to be sticky after long descents. They could be better if they were fitted with ceramic pistons.

[mrpercussive]

I switched back to GRX calipers mainly because I found the XG pistons tend to be sticky after long descents. They could be better if they were fitted with ceramic pistons.

Good to know... yea the zrace were an impulse buy as they were like $55 shipped for a pair... Sounds like possibly the aluminum zrace pistons expanding under high heat? I might try and retrofit the ltwoo pistons in there and see if that works if i dont like them haha|

Or maybe i could try something like this
https://www.aliexpress.us/item/3256803315987372.html?src=google&src=google&albch=shopping&acnt=708-803-3821&isdl=y&slnk=&plac=&mtctp=&albbt=Google_7_shopping&aff_platform=google&aff_short_key=UneMJZVf&gclsrc=aw.ds&albagn=888888&ds_e_adid=&ds_e_matchtype=&ds_e_device=c&ds_e_network=x&ds_e_product_group_id=&ds_e_product_id=en3256803315987372&ds_e_product_merchant_id=515767637&ds_e_product_country=US&ds_e_product_language=en&ds_e_product_channel=online&ds_e_product_store_id=&ds_url_v=2&albcp=19678427463&albag=&isSmbAutoCall=false&needSmbHouyi=false&gad_source=1&gclid=Cj0KCQjwgL-3BhDnARIsAL6KZ6_JUimFvSK-X2ZniA-N7pvCAOrqeBIjpb7JOGu-Pv-qGcLTqcEHKAwaAkznEALw_wcB&gatewayAdapt=glo2usa

[00Garza]

Good to know... yea the zrace were an impulse buy as they were like $55 shipped for a pair... Sounds like possibly the aluminum zrace pistons expanding under high heat? I might try and retrofit the ltwoo pistons in there and see if that works if i dont like them haha|

Or maybe i could try something like this
https://www.aliexpress.us/item/3256803315987372.html?src=google&src=google&albch=shopping&acnt=708-803-3821&isdl=y&slnk=&plac=&mtctp=&albbt=Google_7_shopping&aff_platform=google&aff_short_key=UneMJZVf&gclsrc=aw.ds&albagn=888888&ds_e_adid=&ds_e_matchtype=&ds_e_device=c&ds_e_network=x&ds_e_product_group_id=&ds_e_product_id=en3256803315987372&ds_e_product_merchant_id=515767637&ds_e_product_country=US&ds_e_product_language=en&ds_e_product_channel=online&ds_e_product_store_id=&ds_url_v=2&albcp=19678427463&albag=&isSmbAutoCall=false&needSmbHouyi=false&gad_source=1&gclid=Cj0KCQjwgL-3BhDnARIsAL6KZ6_JUimFvSK-X2ZniA-N7pvCAOrqeBIjpb7JOGu-Pv-qGcLTqcEHKAwaAkznEALw_wcB&gatewayAdapt=glo2usa

That could be a cheap solution if they use the same size piston. Have you measured the zrace ones?
If its a tolerance issue with zrace, then they probably won't solve the problem. I just ordered some grx400 calipers for $33 from ali to replace my ltwoo calipers. Couldn't resist at that price.

[mrpercussive]

That could be a cheap solution if they use the same size piston. Have you measured the zrace ones?
If its a tolerance issue with zrace, then they probably won't solve the problem. I just ordered some grx400 calipers for $33 from ali to replace my ltwoo calipers. Couldn't resist at that price.

Trace Velo measured and said they were both 22mm? But i'm not sure...  I'm probably going to run the stock ones for a bit when mine get here and then if i'm not happy with them do the swap. I also noticed Lewis uses Ti pistons which is interesting! Never seen that before

[jonathanf2]

Pair of GRX 400 calipers:
https://www.aliexpress.us/item/3256807394938962.html

These GRX 400 calipers cost almost as much as the Zrace XG calipers. Weight-wise GRX calipers weigh less than both Ultegra and 105 and there's no difference between GRX 400/600/800 other than appearance. I confirmed with the seller this comes as a pair. I have a set of these on my gravel bike and on long descents the pistons don't get sticky and they're Shimano quality.

[boxof13]

So I went and impulse bought some Zrace XG calipers for my Ltwoo ER9 groupset. Was wondering since the pistons are both 22mm but the Ltwoo ones are ceramic and Zrace is aluminum... has anyone here swapped them to see if they're interchangeable? Lol

Yes, they use the same piston i.e. 22mm. In fact, I replaced my first two Zrace XG pistons with ceramics ones I bought from AE. Unfortunately, one of the two XGs I had started leaking from around the piston. I don't have much time to tinker around, so I replaced that with a new updated XG, which I bought for $22 using discount and coins. By the way, the new XG calipers comes with what looks to be ceramic piston. They are no longer Aluminum. Overall, I think the new updated XG calipers are much improved. This includes longer portion where we thread in the olive, supposedly to avoid having the channel blocked by olives or the hose. This was highlighted in TraceVelo video. Will give XG another chance before moving back to Shimano. Trying for a werightweenie build, so >50gr saving is tempting. Also, for the kind of riding I do, XG is plenty powerful already and have worked well for the past ~7000km for me.

[Takiyaki]

So I went and impulse bought some Zrace XG calipers for my Ltwoo ER9 groupset. Was wondering since the pistons are both 22mm but the Ltwoo ones are ceramic and Zrace is aluminum... has anyone here swapped them to see if they're interchangeable? Lol

I just got a set for my first hydro build... would not recommend. Got a pair, one seems to have a sticky piston. Dont wanna bother with rebuilding or w/e, I just ordered Ultegra.

[elmtree]

There's no way to switch which button is up and which is down on a given side, right? When sprinting I'm struggling to hit the rear button on the right to get a harder gear.

[mrpercussive]

There's no way to switch which button is up and which is down on a given side, right? When sprinting I'm struggling to hit the rear button on the right to get a harder gear.

AFAIK there isnt except for the front derailleur where you cans wap it to be a single button shift

[jonathanf2]

You can adjust lever position to move it closer to the drops. Especially if you can't reach the buttons.

[Sebastian]

I wish the buttons were customisable. Being able to do that is kind of the point of going electronic. I wonder why they’re not. Patent reasons or did LTWOO just not bother. I’d love to set the shift buttons up Sram style.

[elmtree]

The issue is I can too easily reach the further shift button so when I'm sprinting my finger rests on the shift button for going easier. Not ideal haha

Maybe I'll shoot them an email about configurable buttons

[jonathanf2]

Finally happened. My 2nd ER9 RD died on me during a ride. My 1st ER9 groupset is working great, but this 2nd one just stopped. FD works fine, shifters seem to be working and battery holder/cables haven't been compromised. Plus I don't ride in the rain, so it's definitely a bad RD and not a water ingress issue. I just contacted the 80 Design Store to see if I can get a replacement unit. Hopefully they live up to their customer service reputation!

[boxof13]

Finally happened. My 2nd ER9 RD died on me during a ride. My 1st ER9 groupset is working great, but this 2nd one just stopped. FD works fine, shifters seem to be working and battery holder/cables haven't been compromised. Plus I don't ride in the rain, so it's definitely a bad RD and not a water ingress issue. I just contacted the 80 Design Store to see if I can get a replacement unit. Hopefully they live up to their customer service reputation!

Ouch! Hopefully 80 Design Store will sort you out quickly!
Just wondering, you mentioned that FD is still fine. Does it still shift with dead RD? Could it be that RD is somehow stuck mechanically? I remember seeing TraceVelo had this issue on his eGR, I think!?