When I put together my build, I got er9 for 460 EUR and combined it with a used crankset and a lightweight Aliexpress cassette & chain. 105 Di2 actually gets more expensive when you buy individual parts and not a full groupset. But I simply didn't need a complete groupset as I had various parts lying around. The cheapest offerings to put together a 105 Di2 mini groupset was something like 650-700 EUR IIRC. To me at the time, that was enough to go the cheaper route. Knowing what I know today, I'd probably get a Sram Mini gruppo which sometimes can be had for around 650ish EUR and be done with cables entirely. My wheels don't have an XD freehub but Sram should work just fine with regular cassettes/chains and chainrings as well. No definite need for flattop chains and 10tooth cog cassettes, I think.
Wheeltop seems interesting as well but I don't see the point when it's basically (almost) as expensive as Western brands.

You're a brave man, i applaud that.
on price matching, the lower prices are usually because people buy during a "sale" on aliX. Also depends on the region you're in. For example, if in EU, you see prices incl. VAT. Not the case in the UK. Shipping depends on region too. Those who live in Australia pay less in shipping. Long story short, it's complicated. There's a guy selling er9 on the forum btw, his user name is very long and has plates in it i think.
everything kind of works with everything. er9 doesnt sell rotors, cranks, cassette, chain, anyway. i have an ultralight steel & alu cassette, chinese, i m very happy with it, but you ll find people here saying it's shit. as long as it's calibrated properly, it works great, on my setup anyway.
there's a number of youtubers saying that expensive rotors dont brake any better than cheaper ones, so you may want to save your money there. It also depends on the riding you do, and your weight.

Basically what I want doesn’t exist or barely exists but is super expensive from a western brand. I want a Boost, flat mount, gravel fork with a ~400 A2C measurement, and clearance for 2.4” tire for a custom Ti frame I’m designing. There is the Curve Seek fork with 430mm A2C and the Bearclaw Ramhorn Boost fork with 41mm A2C, but both are over $600 USD. Does anyone know of a manufacturer who works with clients to design a custom carbon fork? Or perhaps knows who makes the Bearclaw or Curve forks? Thanks.

so you matched the prices but as you dropped LTWOO from your website no one can find this nice deals online?
or am i just too blind to find them?

Ltwoo has a website with fairly good listing of documentation. You can find the manual for the eR9/eRX series, and it's actually a pretty good manual. It clearly states that you can do fine tuning of individual gears through button presses on the groupset and brifters. Please go check that out to see the procedure. However, I don't see anything about being able to switch from 12speed to 11 or 10speed via buttons, so I think that functionality may be only available through the app.


How did you arrive at this answer? As far as I can see, the app is not mandatory (except to switch from 12 speed to some other speed cassette).


Exactly my thoughts. Except it doesn't even appear to be necessary to worry about long term app functionality, as you may only *really* need it to re-purpose the groupset onto other bikes and maximize your use of it long term. If you simply install it on a bike and keep it on that bike, you probably won't need the app 10 years from now as long as you keep it on the same bike.

Well, i have asked which functions can be set via buttons and i did not receive an answer, yet...but it has only be 8 month...i think i will have to patient...lol

As far as matching functionality to Di2, not even Shimano lets you swap the number of gears or even let you microadjust through an app so it's already a false comparison. If Ltwoo goes out of business tomorrow and their app ceases to exist, then you'd still have an electronic derailleur with as much functionality as a Shimano Di2 derailleur, right?

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

2) poor support from Ltwoo and availability of spare parts: I currently have two ltwoo groupset and I'm very happy with them (GRT and R9) but I recently broke the right shifters. When contacting Ltwoo official store or ltwoo factory store on Ali they are very very slow at replying and the only answer I got is that the R9 is out of production so they are unsure if they can sell me the single shifter and I should buy both (that apparently cost more than the full groupset). My concern is the following: mechanical groupset from ltwoo are fairly cheap, but if the same issue happen with the Erx or Er9 I wouldn't want to be payong an electronic groupset twice.