LTWOO GRT Disc 1x12 Speed Hydraulic Disc Brake Gravel Groupset Carbon Alloy Version ZRACE XG Caliper Flat Mount Capable GRX

GRT 1x12 Speed Gravel Bike Carbon & Alloy Version Groupset Mechanical Shifting Hydraulic Disc Brake

Package Components

LTWOO GRT Right Shifter ×1 (Shifting cable included)
LTWOO GRT Left Shifter ×1
LTWOO GRT Rear Derailleur ×1

ZRACE XG Calipers ×2

Options:
LTWOO GRT Carbon Version
LTWOO GRT Alloy Version

Version Guide

Design for gravel enthusiasts, the LTWOO GRT 1x12 speed groupset is available in both carbon fiber and aluminum alloy.

Both versions share identical core functionality, differing slightly only in material composition, shifter refinement, and graphic design.

Notice

In order to avoid SHIMANO's patent, LTWOO's Hydraulic Disc Brake Caliper uses a 70mm spacing mounting seat, and then installs it through an adapter, so that not only the Caliper is heavy, but the adapter is also very heavy, and the most important thing is that for some frames It is still not compatible, so we replaced the Flat Mount Caliper of ZRACE XG, so that the whole set can reduce weight 120g! and can be compatible with all flat mount frames and Forks.

​And it can be installed on the frame of Post Mount and IS Mount through ZRACE's Flat to Post / IS Adapter.

Shifter ( Carbon version)

Material:
Carbon fiber brake lever.

Operation:
Right: Dual shifter lever.
Left: Brake lever only.

Cables:
Shifting cables included.

Weight:
Left: ≈214g
Right: ≈280g

Shifter (Aluminum alloy Version)

Material:
Aluminum alloy brake lever.

Operation:
Right: Dual shifter lever.
Left: Brake lever only.

Cables:
Shifting cables included.

Weight:
Left: ≈235g
Right: ≈305g

Rear Derailleur

Features a one-way mechanical damper system for a more stable chain on rough roads.

Both pulley wheels feature a narrow-wide tooth structure, making it perfect for large cassette riding and ensuring maximum chain stability.

Max Sprocket: 52T
Carbon Version Weight: ≈283g
Alloy Version Weight: ≈300g

ZRACE XG Calipers

Extruded and machined from a single block of 7075 aluminum, eliminating caliper flex under heavy braking.

It delivers a rock-solid lever feel, superior heat dissipation, and eliminates any risk of joint leakage by removing traditional body bolts and internal O-rings.

Weight: 96g