00:08:46Miller_cycling
7,000km with Ltwoo eRX/9 Electronic Groupset: is it any good?
Miller_cycling
November 23, 2025
Description
Long term review of Ltwoo eRX/eR9 v1 groupset.
I have no affiliation or connection with Ltwoo.
GroupsetLTWOO V3 eRX eR9 2x12s / 2x11s Electronic Groupset, Road Electronic Groupset, Replaceable battery, APP programming
Created: March 02, 2025The 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
- Rubber moldings for the hoods have stayed in really good condition
- The accompanying app is pretty good and allows fine-tuning of derailleur position for each gear and adjustment for different cassette types (9-13 speed)
- System is cheap compared to major brands (cost him £375 for shifters, derailleurs, brake calipers, and battery holder)
- Derailleurs are less bulky than some competitors because they don't carry individual batteries
- Rear derailleur can handle large cassettes (he uses a 34 and believes it could go bigger)
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
- On rare occasions in cold weather, the rear derailleur has swung all the way to the biggest sprocket when selecting a lower gear, giving a much lower gear than expected
- LTWOO does not have its own chainset (he used a separate carbon chainset from another manufacturer)
- Slightly clunky mounting system for brake calipers, using adapters marked front/rear to use the same caliper design for both
MyBikeParts
aliexpress.com#1005007170966967Affiliate · MyBikeParts
🇺🇸$712.97
🇫🇷€418.39
🇬🇧£359.59
Checked 10 months ago