The LTWOO V3 electronic groupset offers excellent electronic shifting performance at a fraction of major brand prices, but reliability concerns, poor customer support, and some technical quirks remain significant drawbacks.
Pros
- Excellent value for money compared to Shimano/SRAM
- Good shifting performance and speed when properly tuned
- Flexible compatibility with various cassettes, cranksets, and brake components
- Ergonomic shifters with comfortable hoods
Cons
- Poor reliability and high failure rates in early versions
- Very poor customer support and warranty service
- Water sealing issues, particularly in V1/V2 versions
- Mushy or unreliable shift buttons on early versions
Key Facts
- Uses standard 14500 800mAh 3.7V replaceable batteries
- Hydraulic brakes use mineral oil and are compatible with Shimano calipers
- V3 version features USB-C charging on the front derailleur only
Reviews & Ratings
The reviewer provides a long-term review of the LTWOO V3 eRX/eR9 electronic groupset after approximately 7,000 kilometers of use. He describes it as a semi-wireless Chinese groupset with shifters communicating wirelessly to derailleurs that are hardwired to a seatpost battery. Overall, his experience has been very positive, finding it well-made, functional, and enjoyable to use, though he notes some minor issues.
AI Summary
Pros
- Well-made and holding up well to use
- Light and efficient shifting
- Front and rear shifting is very good
more pros in the video
Cons
- Parts are more functional than pretty, not winning awards for industrial elegance
- Very light action on the shift buttons caused accidental gear changes when riding over bumps with hands resting on them
- The charging lead failed (it contains electronics for LED status), requiring a replacement to restore system function
more cons in the video
Key Points
- Model reviewed is the LTWOO ER9 (all aluminum) / eRX (with some carbon parts); they are functionally identical
- The reviewer used version 1; version 3 is now available with changes including USB-C charging directly to the front derailleur and firmer button action
- System is semi-wireless: shifters are wireless, front and rear derailleurs are hardwired to a battery in the seatpost
more key points in the video
The reviewer discusses the LTWOO V3 eRX eR9 electronic groupset as part of a broader overview of Chinese cycling components. He mentions it's an upgrade to the IR9 with some carbon elements, available for around 500-600€ for almost the entire groupset via AliExpress, and compares its feel to Shimano 105. He notes it uses a battery in the seatpost and has app control capability.
AI Summary
Pros
- Upgrade to IR9 with some carbon elements
- Available for around 500-600€ for almost the entire groupset
- Shifting feel is very comparable to Shimano 105
more pros in the video
Cons
- Battery must be installed in the seatpost and connected (doesn't have the advantage of a smaller derailleur or not needing two separate batteries for front and rear derailleurs)
Key Points
- Version 3 (V3) should be ordered
- Electronic groupset
- 2x12s/2x11s configuration
more key points in the video
The reviewer briefly mentions the L-TWOO 2025 eRX Road Electronic Hydraulic Disc Brake Groupset 2x10-12 SPEED but does not provide detailed analysis.
AI Summary
The reviewer briefly mentions the L-TWOO 2025 eRX Road Electronic Hydraulic Disc Brake Groupset 2x10-12 SPEED but does not provide detailed analysis.
AI Summary
The LTWOO eRX/eR9 (V3) is a Chinese electronic road groupset known for its low price, typically $300-$500 USD on AliExpress with coupons. It features 11/12-speed compatibility, hydraulic disc brakes using mineral oil, and replaceable 14500 batteries. Key attributes include: price around $300-$500, weight varies by model (eR9 alloy, eRX carbon; eR7 is a mid-tier option), and it uses standard road standards with compatibility for various cassettes (up to 34T with modifications) and cranksets. The V3 version introduced USB-C charging on the front derailleur, improved shift buttons, and better water sealing, though reliability and warranty support remain common concerns. A recurring issue is the groupset suddenly becoming unresponsive mid-ride, requiring a brief charger connection to 'wake up' the system. This is often caused by the battery holder slipping inside the seatpost, triggering BMS protection. Users recommend securing the battery holder with rubber mounts or bubble wrap. Additionally, the groupset does not support USB-C to USB-C (PD) charging; only USB-A to USB-C cables or OTG adapters work. Shifting performance is significantly improved with Shimano cassettes and chains, while aftermarket Chinese cassettes may cause hesitation. The groupset continues to mature, with newer versions featuring lighter brake calipers (about 70g lighter per caliper) and improved compatibility. A major recent update (June 2026) reintroduced auto-trimming for the front derailleur, which automatically adjusts to prevent chain rub and works on many firmware versions via app update. The 'First Aid Kit' option in the app is a new but undocumented feature. However, users report ongoing challenges: non-standard batteries (e.g., 1000mAh or 1500mAh) can cause failure to wake up; the battery holder can break when inserting tight batteries; and firmware updates can still brick components. Customer support remains poor, with reports of LTWOO representatives becoming defensive when criticized. The new fully wireless eGR groupset with integrated battery is not yet released as of mid-2026. Despite these issues, the groupset offers excellent value for DIY enthusiasts willing to troubleshoot.
AI Summary
Pros
- Excellent value for money, offering electronic shifting at a fraction of Shimano/SRAM prices.
- Good shifting performance and speed when properly tuned, with crisp and fast shifts.
- Flexible compatibility: works with various cassettes (beyond 32T with mods), cranksets, and mineral oil brake calipers from other brands.
more pros in the review
Cons
- Poor reliability and high failure rates, especially for early versions (V1/V2), with rear derailleurs dying from water ingress or other issues.
- Very poor customer support and warranty service from LTWOO, with sellers often unhelpful or ghosting customers.
- Water sealing issues, particularly in V1/V2 where charging ports allow water ingress, leading to failures.
more cons in the review
Key Points
- V3 version features USB-C charging on FD (no RD port), improved buttons, and better sealing.
- Compatible with cassettes beyond 32T (e.g., 34T, 36T) with pulley wheel swaps or OSPW cage.
- Uses standard 14500 800mAh 3.7V batteries. Non-standard capacities may cause issues.
more key points in the review
Where to Buy
LTWOO V3 eRX eR9 2x12s / 2x11s Electronic Groupset, Road Electronic Groupset, Replaceable battery, APP programming
L-TWOO 2026 eRX Road Electronic Hydraulic Disc Brake Groupset 2x10-12 SPEED
Specifications
Attributes
Included Components
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