2025 LTWOO eRX TT + ZRACE UNCHAINED PRO Groupset

Overview & Key Features
The 2025 LTWOO eRX TT + ZRACE UNCHAINED PRO Groupset is a complete wired electronic drivetrain built for aerodynamic efficiency, precision control, and podium-level performance in time trial and triathlon racing. The blip-style shifters integrate seamlessly into aero cockpits, while the carbon-caged derailleur and UNCHAINED PRO crankset deliver optimized power transfer and stiffness. Designed for clean cable routing, wide-range gearing, and high-output riding, this is your race-day weapon.

Key Features:

• Electronic blip control (10–12-speed compatible)
• Carbon rear derailleur cage (11T–32T) with oversized pulley option
• Hydraulic disc brakes with “Serial Channel” internal bleed system
• UNCHAINED PRO carbon alloy crankset with T6-treated AL7075 chainrings
• Multiple chainring size options including 54-40T for flat TT power
• Free 12-speed ZRACE chain included
• Cassette support for both HG and XDR systems
  

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 PRO Crankset

• Model: UNCHAINED PRO
• Crank Arm Sizes: 165mm / 170mm
• Axle Diameter: 29mm (DUB standard)
• Axle Length: 94mm
• Q-Factor: 149mm
• Crank Arm Weight: 330g ±5g
• Spider: 6061 Aluminum Alloy, Weight: 60g
• Chainring Material: AL7075, T6 Heat Treated
• Chainring Colors: Black
• Chainring Sizes & Weights:
  • 50-34T: 161g
  • 52-36T: 176g
  • 54-40T: 195g
• Features: Ultra-light, high-stiffness power transfer optimized for aero and high-cadence TT use

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 PRO Groupset with LTWOO eRX TT is purpose-built for aerodynamic dominance, effortless shifting, and drivetrain stiffness. The PRO crankset’s carbon construction, precision-machined spider, and T6-treated chainrings provide unmatched efficiency and power delivery, while the eRX system offers tight, responsive shifting and electronic integration for modern TT machines.

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 PRO Crankset (165mm or 170mm)
• AL7075 Chainring Set (50-34T / 52-36T / 54-40T)
• ZRACE RT-RX Rotors (160mm, Center Lock or 6-Bolt)
• ZRACE 12-Speed Chain (Silver)
• Cassette (user choice: ALPHA HG / STD HG / ALPHA XDR)
• Bottom Bracket (user choice: DUB-compatible ROAD type)

Chase your best time yet—equip your ride with the 2025 LTWOO eRX TT + ZRACE UNCHAINED PRO Groupset and deliver your peak performance, every ride.