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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.
AI-Generated Forum 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.
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.
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.
Frequently Asked Questions
What is the difference between eR9, eRX, and eR7?
eR9 is alloy, eRX is carbon (cosmetic/weight), eR7 is a newer mid-tier with standard RD mount (not shadow-plus). All V3 versions share USB-C charging on FD and similar electronics.
How do I charge the V3 groupset?
V3 charges via USB-C port on the front derailleur only; the rear derailleur has no charging port. For 1x setups without an FD, a special cable or older RD with charging port is needed.
What cassette sizes are supported?
Officially supports up to 32T, but users successfully run 34T and 36T cassettes with modifications like Shimano pulley wheels, OSPW cage, or careful tuning.
Is it compatible with Shimano cranksets and components?
Yes, works well with Shimano cranksets, chainrings, cassettes, and brake calipers (mineral oil). Many users mix components for optimal performance.
How is the water resistance and can it be ridden in rain/winter?
Poor in early versions; V3 has improved sealing. Users recommend dielectric grease, rubber cement, or varnish on PCBs for protection. Performance in cold/wet conditions is mixed, with some failures reported.
Where is the best place to buy and ensure I get the V3 version?
Recommended sellers include 80 Designer Store, Panda Podium, or LTWOO Official Store on AliExpress, but always message to confirm V3 stock and check photos, as old stock may be shipped.
Where to Buy
