2025 LTWOO eR9 TT + ZRACE Unchained Pro Powermeter Groupset

The 2025 LTWOO eR9 TT + ZRACE UNCHAINED PRO Powermeter Groupset is a top-tier wired electronic drivetrain built for time trial and triathlon racing. Featuring wireless blip-style shifters, race-optimized alloy derailleurs, and the integrated ARCRAYO dual-mode power meter inside the ZRACE UNCHAINED PRO crankset, this system delivers precise electronic shifting, real-time power data, and elite aerodynamic performance.

Key Features:

• Wireless electronic blip shifting (10–12-speed compatible)
• ARCRAYO power meter with ±1.5% accuracy (ANT+/Bluetooth)
• Medium cage rear derailleur (11T–32T), internal damping
• Hydraulic disc brakes with “Serial Channel” internal bleed routing
• UNCHAINED PRO crankset with AL7075 chainrings and full power data integration
• Free 12-speed ZRACE chain included

Shifters & Brake Levers

Model: BL-R8001 + SW-R8001-L

• Type: Wireless blip-style shifters
• Material: Aluminum (BL), Composite (SW)
• Braking Mode: Hydraulic Disc
• Speed Compatibility: 10–12-speed
• Weight: 296g total (148g L/R levers + 40g SWs)
• Notes: Clean cockpit setup for triathlon and TT bars

Electronic Controller

Model: SW-R8001-L

• Control Method: Wireless
• Compatibility: eR9 TT-specific
• Speed Compatibility: 10–12-speed
• Material: Composite Plastic
• Weight: 40g
• Notes: Seamless integration with cockpit and derailleurs

Front Derailleur

Model: FD-R8301

• Speed: 2-speed
• Max Chainring: 54T
• Chainline: 43.5–44.5mm
• Shifting: Wired electronic
• Material: Lightweight aluminum
• Weight: 138g
• Notes: Optimized for smooth front shifts in aero setups

Rear Derailleur

Model: RD-R8301

• Speed Compatibility: 10–12-speed
• Max Cassette: 11–32T
• Cage Length: Medium (93mm)
• Material: Aluminum
• Weight: 292g
• Features: Stable tracking, clean cable routing, oversized pulley-ready

Braking System (Included)

Model: BR-R6120-F (Pair)

• Type: Hydraulic disc
• Rotor Compatibility: 140mm / 160mm
• Caliper Weight: 220g (pair)
• Pad Type: Shimano-compatible
• Cooling: “Egg Roll” fin system for thermal control
• Maintenance: Internal Serial Channel routing

ZRACE UNCHAINED PRO Powermeter Crankset

• Crank Arm Sizes: 165mm / 170mm
• Axle: 29mm DUB Standard, 94mm length
• Q-Factor: 149mm
• Crank Arm Weight: 330g ±5g
• Spider: 6061 Aluminum Alloy, 60g
• Chainring Material: AL7075, T6 Treated
• Chainring Sizes & Weights:
  • 50-34T: 161g
  • 52-36T: 176g
  • 54-40T: 195g
• Crank Interface: EASTON
• BCD: 110mm, 4-bolt

ZRACE x ARCRAYO Power Meter Specs

• Accuracy: ±1.5%
• Power Range: 0–2200W
• Cadence Range: 30–180 RPM
• Measured Data: Power, Cadence, L/R Balance, Pedal Smoothness
• Protocols: ANT+, Bluetooth
• Device Compatibility: Garmin, Wahoo, CYCPLUS, Shanren, Maijin, Giant, IGPSTORT, more
• Calibration Options: Auto / Code Table / Bluetooth
• 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: Vented design for heat management

ZRACE Chain (Included Free)

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

 Cassette Options

ALPHA HG (12-Speed – HG Freehub)

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

STD HG (12-Speed – HG Freehub)

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

ALPHA XDR (12-Speed – XDR 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 DUB axle cranksets:

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

Why Choose This Groupset?

The 2025 LTWOO eR9 TT + ZRACE UNCHAINED PRO Powermeter Groupset combines race-ready shifting and braking with professional-grade power measurement. With wireless cockpit integration and precise left/right balance tracking, this is the ideal drivetrain for athletes who train with metrics and compete for the podium. Aero, accurate, and built for speed.

What’s Included in the Box?

• LTWOO eR9 TT Wireless Blip Shifters (BL-R8001)

• eR9 Wireless Control Unit (SW-R8001-L)

• Front Derailleur (FD-R8301, 2-speed)

• Rear Derailleur (RD-R8301, Medium Cage)

• Hydraulic Disc Brake Calipers (BR-R6120-F, Pair)

• ZRACE UNCHAINED PRO Crankset (165mm or 170mm, 29mm axle)

• Integrated ARCRAYO Power Meter (USB magnetic 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 rig with the 2025 LTWOO eR9 TT + ZRACE UNCHAINED PRO Powermeter Groupset and power every second with measurable precision.