LTWOO ER9 Wireless Electronic Shifting Groupset, Compatible with 3-12 Speed for 14-20 Inch Folding Bike/Flat Bar Road Bike

L-TWOO ER9 Wireless Electronic Shifting Groupset

Core Selling Points

Wireless Control

​No cables, no clutter. Enjoy an ultra-clean bike setup with quick and hassle-free installation.

IPX7 Waterproof Rating

​Industry-leading waterproof protection. Built to handle rain, mud, and ​high-pressure washing with confidence.

High-Precision Signal Transmission

​Powered by a 2.4G wireless protocol with a signal packet loss rate of less than 0.01%, ensuring instant and precise shifting response.

Multi-Speed Compatibility

​One rear derailleur supports 10-speed, 11-speed, and 12-speed systems.
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Easily switch between gear modes through the APP with one click.

Smart APP Fine Tuning

​Compatible with the official L-TWOO APP, featuring 32-level micro-adjustment for precise indexing and ultra-smooth shifting ​performance.

Technical Specifications

Rear Derailleur

Model: ER9 Wireless Short Cage Rear Derailleur
Material: High-strength aluminum alloy body
Cage Length: 55mm
Compatible Speeds: 10 / 11 / 12 Speed
Cassette Compatibility:
·Minimum Cog: 10T / 11T
·Maximum Cog Capacity: 32T (Min) – 40T (Max)
Battery: Built-in rechargeable lithium battery (non-removable)
Battery Life: Approx. 1200–1500 km per charge
Charging Port: USB-C
Weight: Approx. 311g

Wireless Shifter

Material: Lightweight composite material
Battery Type: CR2032 button battery
Battery Life: Approx. 4–6 months
Connection Protocols:2.4G / Bluetooth / ANT+
Weight: Approx. 50g

Compatible Bike Types

1. 14–20 Inch Folding Bikes

​Short cage design provides increased ground clearance for more stable shifting performance.

2. Flat Bar Road Bikes

​Delivers a more responsive and race-inspired shifting experience.

3. Urban Commuter / Hybrid Bikes

​Lower maintenance requirements with more intuitive and user-friendly operation.

User Guide & FAQ

How to Activate the System?

Upon receiving the product, press and hold the function button for 5 seconds to disable Transport Mode and activate the system.

How to Pair the Components?

Before installation, press and hold the shifter button for 3 seconds until the green indicator stays on, then short press the rear derailleur function button to complete wireless pairing.

How to Switch Speed Modes?

Download the “L-TWOO” APP, connect via Bluetooth, and freely switch between 10-speed / 11-speed / 12-speed modes.

Package Includes

1 × ER9 Wireless Rear Derailleur
1 × Wireless Shifter
1 × Charging Cable
1 × User Manual