2025 LTWOO eRX TT + ZRACE RX 12-Speed TT/Tri Groupset

Overview & Key Features
The 2025 LTWOO eRX TT + ZRACE RX Groupset is a full 1x/2x electronic drivetrain engineered for elite time trial and triathlon setups. With low-drag blip shifting, precise 10–12-speed compatibility, carbon-enhanced components, and Shimano-compatible hydraulic disc brakes, it delivers aerodynamic efficiency and uncompromising performance. Included ZRACE crankset, rotors, and free 12-speed chain round out a race-ready package.

Key Features:

Electronic blip control for TT/Tri bars (10–12-speed compatible)
Carbon rear derailleur cage (11T–32T) with oversized pulley option
Hydraulic disc brakes with internal Serial Channel bleed
ZRACE RX crankset (DUB compatible) + heat-dissipating 160mm rotors
Wide cassette range options in HG or XDR formats
Free 12-speed ZRACE chain included

Shifters & Brake Levers

Type: Electronic Blip System
Material: Carbon Fiber
Braking Mode: Hydraulic Disc
Side: Left / Right Pair
Speed Compatibility: 10–12-speed
Weight: 296g (pair)
Notes: Designed for TT/Tri bars with minimal cockpit interference and dedicated blip ports

Electronic Controller

Control Method: Wireless blip input
Compatibility: eRX-specific (TT setups only)
Speed Compatibility: 10–12-speed
Material: Composite Plastic
Weight: 109g (pair)
Notes: Central routing hub for all cockpit electronics

Front Derailleur

Speed: 2-speed
Max Chainring Size: 56T
Chainline: 43.5–44.5mm
Shifting: Wired Electronic
Material: Lightweight Alloy
Weight: 140g
Design: Smooth, fast transitions for large aero chainrings

Rear Derailleur

Speed Compatibility: 10–12-speed
Max Cassette Range: 11T–32T
Material: Aluminum Body, Carbon Fiber Long Cage
Weight: 270g (292g with oversized pulley option)
Features: Internal damping, cage lock, oversized pulley upgrade option

Braking System (Included)

Type: Hydraulic Disc
Rotor Compatibility: 140mm / 160mm
Caliper Weight: 277g (pair, with pads)
Pad Type: Shimano-compatible
Cooling: "Egg Roll" fin system for heat management
Maintenance: "Serial Channel" internal bleed routing for cleaner cockpit

ZRACE RX Road Crankset

Material: 6061 Aluminum Crank Arms + 7075 Aluminum Chainrings
Q-Factor: 148mm
BCD: 110mm
Bottom Bracket Compatibility: DUB
Weight: 525g
Features: 3-Hole Hollowtech, CNC-machined arms for efficiency & stiffness

ZRACE RT-RX Disc Brake Rotors

Material: Stainless Steel Disc + Aluminum Bracket
Size: 160mm
Weight: 111g (Center Lock) / 126g (6-Bolt)
Features: Vented design for optimized heat dissipation

ZRACE Chain (Included Free)

Speed: 12-Speed Compatible
Weight: 271g (126L)
Color: Silver
Features: Low-friction coating for smooth, durable shifting

Cassette Options

ALPHA HG (12-Speed – HG Freehub)

Materials: Molybdenum Steel + 7075 Aluminum
Multiple color options
Options:
- 11-28T: 133g
- 11-30T: 142g
- 11-32T: 144g

STD HG (12-Speed – HG Freehub)

Material: AL7075 CNC-Machined
Options:
- 11-30T (312g): 11-12-13-14-15-16-17-19-21-23-26-30T
- 11-32T (341g): 11-12-13-14-15-17-19-21-23-25-28-32T

ALPHA XDR (12-Speed – XDR Only)

Material: Cr-Mo Steel + 7075 Aluminum
Range: 10-28T
Weight: 208g
Tooth Layout: 10-11-12-13-14-15-16-17-19-22-24-28T

Bottom Bracket Compatibility (DUB Crankset Compatible Only)
Choose one of the following ROAD-SPECIFIC Aluminium bottom brackets:

BB30-ROAD
PF30-ROAD
BB86
BB92
BB386
BSA-ROAD

Why Choose This Groupset?

This is a complete, high-performance time trial and triathlon drivetrain built to compete. The LTWOO eRX TT offers fully electronic precision, while ZRACE provides CNC-machined crank and rotor systems with exceptional power and heat control. With wide cassette support, efficient braking, and an integrated cockpit layout, it’s a podium-ready upgrade for serious athletes.

What’s Included in the Box?