2025 LTWOO eRX TT + ZRACE UNCHAINED Groupset

Overview & Key Features
The 2025 LTWOO eRX TT + ZRACE UNCHAINED Groupset is a complete electronic drivetrain engineered for aerodynamic performance in time trial and triathlon racing. Featuring blip-style shifters, a compact wired control hub, carbon-enhanced derailleurs, and Shimano-compatible hydraulic brakes, it offers race-grade responsiveness and cockpit cleanliness. The ultralight UNCHAINED carbon fiber crankset adds stiffness and efficiency to this podium-ready setup.

Key Features:

• Electronic blip shifting (10–12-speed compatible)
• Carbon rear derailleur cage (11T–32T), oversized pulley upgrade available
• Hydraulic disc brakes with “Serial Channel” internal bleed routing
• UNCHAINED carbon crankset with multiple length & chainring options
• Wide cassette support (HG or XDR)
• 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 UNCHAINED Carbon Fiber Crankset

• Material: Carbon Fiber
• Crank Arm Sizes: 165mm / 170mm / 172.5mm
• Axle Diameter: 28.99mm
• Q-Factor: 152mm
• Chainring Sizes: 50-34T / 52-36T / 53-39T
• Color: Black Marble Carbon Pattern
• Weight: 385g ±5g
• Features: Lightweight, high-stiffness carbon construction built for aero power delivery

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?

The ZRACE UNCHAINED Groupset paired with LTWOO eRX TT is built for speed, precision, and aerodynamic integration. With fully wired electronic control, ultra-light carbon crankset, high-stiffness shifting components, and smooth hydraulic braking, it delivers a complete system for riders chasing marginal gains in every second.

What’s Included in the Box?

• LTWOO eRX TT Blip Shifters (Pair)
• eRX Electronic Control Unit
• Front Derailleur (2-speed, alloy)
• Rear Derailleur (Carbon Cage)
• Hydraulic Disc Brake Calipers (Pair)
• UNCHAINED Carbon Fiber Crankset (28.99mm axle)
• ZRACE RT-RX Rotors (160mm, Center Lock or 6-Bolt)
• Free 12-speed ZRACE Chain (Silver)
• Cassette (user choice: ALPHA HG / STD HG / ALPHA XDR)
• Bottom Bracket (user choice: road-specific type)

Ready for your fastest season yet? Equip your bike with the 2025 LTWOO eRX TT + ZRACE UNCHAINED groupset and take control of every second on race day.