2025 LTWOO eRX TT + ZRACE UNCHAINED PRO POWERMETER Groupset

The 2025 LTWOO eRX TT + ZRACE UNCHAINED PRO Powermeter Groupset is a premium, fully wired electronic drivetrain designed for performance time trial and triathlon setups. Featuring blip-style shifters, carbon-enhanced derailleurs, and the advanced ZRACE UNCHAINED PRO crankset with integrated ARCRAYO power meter, this groupset provides precise electronic shifting, real-time power feedback, and pro-level aerodynamics for serious competitors.

Key Features:

• Wired electronic blip shifting (10–12-speed compatible)
• Integrated dual ANT+/Bluetooth power meter with ±1.5% accuracy
• Carbon rear derailleur cage (11T–32T), oversized pulley option
• Hydraulic disc brakes with “Serial Channel” internal bleed routing
• UNCHAINED PRO crankset with AL7075 chainrings and power data support
• Free ZRACE 12-speed 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: Clean aero integration for TT/Tri setups with minimal bar interference

Electronic Controller

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

Front Derailleur

• Speed: 2-speed
• Max Chainring Size: 56T
• Chainline: 43.5–44.5mm
• Shifting: Wired Electronic
• Material: Lightweight Alloy
• Weight: 140g
• Design: Fast, quiet chainring transitions optimized for aero drivetrains

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 ready

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
• Maintenance: “Serial Channel” internal bleed routing

ZRACE UNCHAINED PRO Powermeter Crankset

• Crank Arm Sizes: 165mm / 170mm
• Axle: 29mm DUB Standard
• Axle Length: 94mm
• Q-Factor: 149mm
• Crank Arm Weight: 330g ±5g
• Spider: 6061 Aluminum Alloy (60g)
• Chainring Material: AL7075, T6 Heat Treated
• Chainring Sizes & Weights:
  • 50-34T: 161g
  • 52-36T: 176g
  • 54-40T: 195g
• Crank Interface: EASTON
• Chainring Interface: 4-bolt BCD110

ZRACE x ARCRAYO Power Meter Specs:

• Accuracy: ±1.5%
• Power Range: 0–2200W
• Cadence Range: 30–180 RPM
• Measured Data: Power, Cadence, Left/Right Balance, Pedal Smoothness
• Data Protocols: ANT+, Bluetooth
• Compatible Devices: Garmin, Wahoo, CYCPLUS, Shanren, Maijin, Giant, IGPSTORT, and more
• Calibration: Auto, Code Table, or Bluetooth Calibration
• Battery Life: 260 Hours
• Charging: USB Magnetic
• Waterproof Rating: IP68
• Operating Temp: –20°C to 50°C
• Power Meter Weight: 109g
• Warranty: 30 months (non-abuse replacement)

ZRACE RT-RX Disc Brake Rotors

• Material: Stainless Steel Disc + Aluminum Bracket
• Size: 160mm
• Weight: 111g (Center Lock) / 126g (6-Bolt)
• Features: Optimized venting for temperature stability during long descents

ZRACE Chain (Included Free)

• Speed: 12-Speed Compatible
• Weight: 271g (126L)
• Color: Silver
• Features: Low-friction coating for smooth and quiet operation

Cassette Options

ALPHA HG (12-Speed – HG Freehub)

• Material: Molybdenum Steel + 7075 Aluminum
• Sizes:
  • 11-28T: 133g
  • 11-30T: 142g
  • 11-32T: 144g

STD HG (12-Speed – HG Freehub)

• Material: AL7075 CNC-Machined
• Sizes:
  • 11-30T: 312g
  • 11-32T: 341g

ALPHA XDR (12-Speed – XDR Freehub Only)

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

Bottom Bracket Compatibility (for 29mm UNCHAINED PRO Crank)
Compatible with ROAD-spec DUB bottom brackets only:

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

Why Choose This Groupset?
With elite-level shifting, precise braking, and true power-based data tracking, the LTWOO eRX TT + ZRACE UNCHAINED PRO Powermeter Groupset is the ultimate drivetrain package for athletes targeting time gains and training optimization. Every pedal stroke is measured, every gram is counted, and every shift is refined for aero racing at the highest level.

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)
• ZRACE UNCHAINED PRO Crankset (165/170mm)
• Integrated ARCRAYO Power Meter (USB charging)
• 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: ROAD-spec DUB type)
• USB Magnetic Charging Cable

Unlock data-driven racing. Equip your setup with the 2025 LTWOO eRX TT + ZRACE UNCHAINED PRO Powermeter Groupset and power every second with precision.