LTWOO ER7 2026 V3 Wireless Electronic Hydraulic Disc Brake Road Groupset 2x10 2x11 2x12 Speed APP Programmable Bike Upgrade Kit

ER7 Version Ⅲ Electronic Road Hydraulic Disc Brake Groupset

The 3rd‑Gen LTWOO ERX wireless electronic road groupset has undergone four years of iterative optimization, ranking as the most reliable domestic electronic shifting system on the China market.

The ER7 adopts the identical proven technology as ERX. They share exactly the same functions and firmware logic; the only difference lies in selected component materials. While ERX uses carbon‑fiber parts, the ER7 applies durable aluminum‑alloy constructions. It delivers the same fast‑response shifting, APP programmability and transport‑mode protection, with enhanced impact‑resistance, lower replacement cost and more cost‑effective value for daily‑use and bike‑upgrade scenarios.

Shift Lever

Type: Electronic Shifting & Hydraulic Disc Brake
Connection Mode: Wireless connection, Bluetooth, ANT+
Material: Aluminum Alloy brake lever
Operation: Electronic shift buttons
Power Supply: CR2032 coin cell battery
Applicable handlebar diameter：22.2mm | 23.8mm
Weight: ~258g per piece

Hold the shift lever function button for 5 seconds to enter pairing mode, then short-press the rear derailleur function button once to complete pairing.

Rear Derailleur

Speeds:Compatible with 10 to 12‑speed drivetrains, adjustable via dedicated APP

Compatible Cassette Teeth: Min 11T, Max 32T
Power Supply: Powered by seat post battery
Waterproof Rating: IPX7
Weight: Approx. 323 g

Front Derailleur

Maximum Compatible Sprocket: 54T
Total capacity: 16T
Chain line: 44.5-46.5mm
Installation angle: 61-66°
Limit adjustment: Electronic limit
Charging interface: Type-C
Power supply: Seat tube battery

USB-C charging port. Compatible with 5V/2A chargers. Power banks are supported.Fast charging is not supported.

Equipped with support screws to prevent front derailleur shifting.

Hydraulic Brake Calipers

One-piece CNC-machined caliper delivers superior rigidity and uniform force distribution.

·Minimal caliper flex under braking
·Direct brake power transfer
·Smooth, linear brake feedback
·Stable, predictable braking control

Rotor Compatibility

Rear Brake:
Direct fit for 140mm rotors;
Adapter mandatory for 160mm rotors

Front Brake:
Adapter required for both 140mm and 160mm rotors

Hose Length

Front brake 0.9m
Rear brake 1.6m

Dual-Way Hydraulic Bleeding System

The dual-direction hydraulic oil circuit improves fluid circulation efficiency and helps eliminate trapped air more effectively.

High-Wear-Resistance Bar-Type Brake Pads

Equipped with bar-style composite brake pads designed to balance heat dissipation and wear resistance.

Seat Post Battery

To prevent poor contact resulting from incorrect operation and vibration, LTWOO V3 seat post battery is non-openable & non-replaceable.

Rated Capacity: 800mAh, 5.92Wh
Nominal Voltage: 7.4V
Max Charging Current: 1.5A
Charging Voltage: 8.4V

L-TWOO APP

Search “LTWOO” in the mobile app store to download.
Supports iOS, Android, and HarmonyOS platforms.

Single-gear fine adjustment.

Each gear can be individually adjusted for clearance,
ensuring more precise shifting
and better cassette compatibility.

3-level shifting speed adjustment.

Speed can be freely adjusted
between fast and slow.