2025 LTWOO eR9 TT + ZRACE Unchained Pro Groupset

The 2025 LTWOO eR9 TT + ZRACE UNCHAINED PRO Groupset is a fully electronic drivetrain built for aerodynamic efficiency, precision control, and podium-level performance in time trial and triathlon racing. With wireless blip-style shifters, alloy derailleurs, and an elite carbon-alloy UNCHAINED PRO crankset, it’s a top-tier race-day system. Integrated hydraulic disc brakes and clean cable routing deliver both performance and aesthetics.

Key Features:

Wireless electronic blip control (10–12-speed compatible)
Medium cage rear derailleur (11T–32T), internal damping
Hydraulic disc brakes with “Serial Channel” internal bleed system
UNCHAINED PRO carbon alloy crankset with T6 AL7075 chainrings
Chainring sizes up to 54-40T for high-power flat TT setups
Free 12-speed ZRACE chain included
Cassette support for both HG and XDR formats

Shifters & Brake Levers

Model: BL-R8001 + SW-R8001-L

Type: Wireless blip lever system
Material: Aluminum (BL), Composite (SW)
Braking Mode: Hydraulic disc
Side: Left / Right Pair
Speed Compatibility: 10–12-speed
Weight: 296g total (148g L/R levers + 40g SWs)
Notes: Designed for TT/Tri bars with minimal cockpit intrusion

Electronic Controller

Model: SW-R8001-L

Control Method: Wireless
Compatibility: eR9-specific TT setups
Speed Compatibility: 10–12-speed
Material: Composite
Weight: 40g
Notes: Central routing and pairing hub for wireless cockpit components

Front Derailleur

Model: FD-R8301

Speed: 2-speed
Max Chainring Size: 54T
Chainline: 43.5–44.5mm
Shifting: Wired electronic
Material: Aluminum
Weight: 138g
Design: Smooth, quick shifts for large aero chainrings

Rear Derailleur

Model: RD-R8301

Speed Compatibility: 10–12-speed
Max Cassette Range: 11T–32T
Cage Length: Medium (93mm)
Material: Aluminum
Weight: 292g
Features: Compact, race-optimized, with stable gear tracking

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
Maintenance: Serial Channel internal bleed routing

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 (60g)
Chainring Material: T6-treated AL7075
Chainring Colors: Black
Chainring Sizes & Weights:
- 50-34T: 161g
- 52-36T: 176g
- 54-40T: 195g
Features: Ultra-light, high-stiffness construction for aero power transfer

ZRACE RT-RX Disc Brake Rotors

Material: Stainless Steel Disc + Aluminum Carrier
Size: 160mm
Weight: 111g (Center Lock) / 126g (6-Bolt)
Features: Vented structure for superior heat control

ZRACE Chain (Included Free)

Speed: 12-speed compatible
Weight: 271g (126L)
Color: Silver
Features: Low-friction finish for smooth and efficient shifting

Cassette Options

ALPHA HG (12-Speed – HG Freehub)

Materials: 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): 11-12-13-14-15-16-17-19-21-23-26-30T
- 11-32T (341g): 11-12-13-14-15-17-19-21-23-25-28-32T

ALPHA XDR (12-Speed – XDR Freehub)

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

Compatible with the 29mm DUB axle:

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

Why Choose This Groupset?

The 2025 eR9 TT + ZRACE UNCHAINED PRO Groupset delivers the ultimate triathlon and TT experience with uncompromising wireless control, carbon-alloy stiffness, and full 12-speed drivetrain integration. Optimized for maximum cadence and power delivery in flat, aero-intensive races, it’s your go-to system for peak performance.