2026 LTWOO eR9 Wireless Electronic Shifting Groupset, Compatible with 10-12 speed for 14-20 inch Folding bike/Flat bar Road bike

Description:

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.

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（Including the official box）

1 × ER9 Wireless Rear Derailleur

1 × Wireless Shifter

1 × Charging Cable

1 × User Manual