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Over the past few years, Chinese cycling brands have gone from budget mechanical groupsets to fully electronic systems that claim to compete with the biggest names in the industry.
After swapping Dura Ace Di2 for Ltwoo ERX V3 on my training bike, I installed it, lived with it, trained on it and judged it honestly to see how close it really gets.
If you want to check out LTWOO ERX V3 yourself: https://s.click.aliexpress.com/e/_c3Dj8FVh
Or to check out any other aliexpress products I reccomend https://s.click.aliexpress.com/e/_EGJ3FYo or enter the search code [AYUMEQ] on the AliExpress homepage.
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Timestamps
0:00 Intro
1:20 The Bike its Going On
2:40 Install
3:10 What it Weighs
7:10 Shifting Performance
8:03 Brakes
9:20 Shifter Ergonomics
10:20 Buttons, or Lack Of
11:03 The App
13:48 USB-C Charging
15:00 Durability Concerns
17:03 The Price
20:55 Is It Worth It?
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Bike part mentions in this video
GroupsetLTWOO eRX Road Electronic Groupset, eRX 2x12s / 2x11s Electronic Groupset, ERX Replaceable Battery, APP Programming
Created: July 06, 2025The reviewer purchased and installed the LTWOO ERX (referred to as L2, L2 V3, L2 ERX, and ERX) electronic groupset on a winter training bike, replacing Dura Ace Di2. They tested it for approximately 5 months. The reviewer states the rear shifting is fast, reliable, and crisp, comparable to other electronic groupsets. The front shifting is noted as noisy, clunky, and slow, reminiscent of older generation products. The app offers extensive customization, including selecting 11 or 12-speed operation and micro-adjusting individual sprockets, but the initial setup was challenging with a default Chinese language setting. The groupset uses a semi-wireless design with USB-C charging via the front mech, which is praised, and battery life is reported as good. The brakes require non-standard adapters for flat mount frames, which the reviewer dislikes. The groupset is significantly heavier than Dura Ace, comparable to Shimano 105. The price is a major advantage, coming in considerably cheaper than Shimano 105 Di2 when factoring in additional drivetrain components. The reviewer concludes it is a solid competitor to 105 Di2 for tinkerers and self-builders, but has compromises compared to top-tier groupsets.
AI-Summary
Pros
- Rear shifting performance is fast, reliable, and crisp.
- Extensive app customization: can be set to 11 or 12-speed, micro-adjust individual sprockets.
- USB-C charging via the front mech is convenient and uses a universal charger.
- Good battery life, on par with Shimano Di2.
- Semi-wireless installation is as easy as Shimano's system.
- Powerful brake bite and easy bleeding (mineral oil).
- Good shifter ergonomics, better than old SRAM eTap.
- Significantly cheaper than Shimano 105 Di2.
- Looks good on the bike, doesn't look cheap.
Cons
- Front shifting is noisy, clunky, and slow, not on par with Dura Ace.
- Brake calipers use a non-standard mount requiring ugly adapters for most flat mount frames.
- The groupset is heavy, comparable to Shimano 105 level, not lightweight.
- Shifter hood rubber is stiff compared to Shimano.
- No auxiliary buttons or satellite shifter compatibility on shifters.
- App was initially in Chinese, requiring guesswork to change language.
- Setup instructions are less documented than major brands, requiring tinkering.
- Potential fragility of the 4-pin cables.
- Past generations had water ingress issues (reviewer did not experience this).
- Lack of support from bike shops, only suitable for confident self-installers.
- Cannot configure shifters for Shimano's 'multi-shift' setup (one button up/down).
Key Points
- Model: LTWOO ERX (also called L2 V3, L2 ERX).
- Type: Semi-wireless electronic groupset.
- Speeds: Configurable via app as 2x11s or 2x12s.
- Charging: USB-C port on the front mech.
- Battery: Replaceable, good battery life.
- App: Allows speed configuration, micro-adjustment per sprocket, and calibration. No physical limit screws on front mech.
- Compatibility: Uses mineral oil brakes. Shifters are wireless, mechs connect via cable to battery.
- Weight: Much heavier than Dura Ace, similar to Shimano 105.
- Price: Paid approx. £350 for shifters, mechs, brakes, battery, and cables.
