What they are stating is fair. As far as in Europe (and maybe in other countries as well), it's the store who needs to provide warranty cases with the consumer and not the company of the product. So if you claim warranty, you need to contact your seller rather than directly Wheeltop.

Idk how it is to deal with Ltwoo directly. What i do know is that dealing with my reseller is torture.

I honestly can not imagine why anyone in their right mind is still buying these groupsets now... The failure rate is so enormous and the aftersale service is so horrible...
The low price is just not worth getting stuck somewhere (and the question seems to be when and not if this will happen) without any chance of repairing the groupset on the road...

Hi all, I'm considering purchasing either the Erx or the Er9 from ltwoo for a new build, but there are few points on which I'd like to ask about your experience:

1) indexing of the gear: from what I can read on the forum and bits and pieces of information from Ltwoo on AliExpress (I could not find a comprehensive description of the groupset) the indexing is done via the partner app. Is there a way to use and index the group without the need to install any app?
Can you press a combination of buttons on the levers that will put the group into a "indexing mode" where you can go through each cogs and do micro adjustments just by clicking on the buttons and then memorizing that specific configuration or the app is the only way to go? (Opposite to what is possible with Shimano ).
My concern is that if in the near future the app becomes unusable (lack of support, new OS version of iOS or Android that do not supper and old app) I will be be left with an electronic for upset that I cannot index anymore

Additionally, there is a report of PCB corrosion caused by condensation due to temperature changes (dew point).

I just put one of the all-steel monoblock cassettes on my road bike, this one from Goldix (cheaper than the ZTTO version and exactly the same): https://www.aliexpress.us/item/3256806508481172.html

I got the 12 speed 11-34 cassette. It weighed in at 252 grams, replacing a 105 cassette weighing 353 grams, so an easy 101 grams saved. I also like the black anodized finish, though I know it's going to wear off and probably not look super great, but that's a problem for future me. It shifts absolutely perfectly in the workstand; unfortunately I'm off the bike for at least another week due to road rash from a crash, so I can't give a full vote of confidence. But all the shifting issues I've experienced on the road have been very obvious in the workstand, so a total lack of such problems is reassuring. Will update when I get a ride or two in.