This electronic road groupset offers excellent value with performance comparable to premium brands when properly tuned, but suffers from reliability concerns, poor customer support, and technical complexities.
Pros
- Excellent value at 300-500 USD for full electronic shifting
- 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
- Firmware updates can potentially brick components
Key Facts
- V3 version features USB-C charging on front derailleur only
- Uses standard 14500 800mAh 3.7V replaceable batteries
- Hydraulic brakes use mineral oil and are compatible with Shimano calipers
Reviews & Ratings
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
- Uses familiar two-button shifting (up/down)
- Has app control capability
- Can be ordered directly via AliExpress when available
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
- Replaceable battery (installed in seatpost)
- APP programming/control available
- Shifting mechanism uses two buttons like Shimano
- Part of LTWOO's lineup of electronic groupsets
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 not heavily discussed but noted as competitive, materials include alloy (eR9) or carbon (eRX) components, 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. Recent updates indicate the groupset is maturing with fewer issues, and newer versions feature upgraded brake calipers that are about 70g lighter per caliper. However, users report ongoing challenges with firmware updates potentially bricking components, inconsistent firmware versions affecting compatibility, and difficult brake bleeding procedures requiring specific techniques. The groupset supports a wide range of gearing, including 50/34 chainrings with 11-34 cassettes, and pulley wheel swaps (e.g., to Shimano) are recommended for improved shifting performance with larger cassettes.
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.
- Ergonomic shifters with comfortable hoods, appreciated by users with medium hands.
- Replaceable standard batteries (14500) allow easy swaps and avoid proprietary battery issues.
- The groupset is maturing with fewer reported issues over time, and newer versions like the ERX with upgraded brake calipers address earlier shortcomings.
- Supports a wide range of gearing setups, including 50/34 chainrings with 11-34 cassettes, with proper tuning.
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.
- Mushy or unreliable shift buttons on early versions, and occasional software glitches causing erratic behavior.
- Weak chain tension in the rear derailleur cage, leading to chain slap and drops, especially compared to Shimano.
- Front derailleur adjustment difficulties, including rubbing issues and limited inward movement, particularly with standard chainlines.
- Firmware updates can potentially brick components, with reports of front derailleurs being killed during updates.
- Bleeding hydraulic brakes can be problematic, requiring specific techniques like using two syringes, ensuring the caliper bleed port is the lowest point, and loosening a small screw in the shifter lever.
- Inconsistent firmware versions and product compatibility, with some components (e.g., V3 shifters with V2 front derailleurs) not pairing correctly despite being the same type.
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.
- Hydraulic brakes use mineral oil and are compatible with Shimano/other calipers.
- App allows fine-tuning, firmware updates, and gear protection settings.
- Components (eR9, eRX, eGR, eR7) are largely cross-compatible.
- New versions (2026) have updated brake calipers and gold logos.
- New V3 brake calipers are ~70g lighter per caliper than older V3 calipers.
- Firmware updates can risk bricking components; inconsistent versions affect compatibility.
- Brake bleeding requires specific techniques: use two syringes, ensure caliper bleed port is lowest point, and loosen a small screw in the shifter lever.
Where to Buy
L-TWOO 2025 eRX Road Electronic Hydraulic Disc Brake Groupset 2x10-12 SPEED
Specifications
Attributes
Included Components
Questions about LTWOO V3 eRX eR9 2x12s / 2x11s Electronic Groupset, Road Electronic Groupset, Replaceable battery, APP programming
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