2025 LTWOO eR9 TT + ZRACE Unchained Groupset

The 2025 LTWOO eR9 TT + ZRACE UNCHAINED Groupset is a complete 1x/2x electronic drivetrain engineered for aerodynamic performance in time trial and triathlon racing. Featuring wireless blip-style shifters, a compact wireless control system, alloy derailleurs, and Shimano-compatible hydraulic brakes, it offers race-grade responsiveness and a clean cockpit layout. The ultralight ZRACE UNCHAINED carbon fiber crankset enhances stiffness and efficiency in every pedal stroke.

Key Features:

Wireless blip shifting (10–12-speed compatible)
Alloy rear derailleur (11T–32T), medium cage design
Hydraulic disc brakes with “Serial Channel” internal bleed routing
UNCHAINED carbon crankset with multiple lengths & chainring options
Wide cassette support (HG or XDR formats)
Free 12-speed ZRACE chain included

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 aero bar setups with clean integration

Electronic Controller

Model: SW-R8001-L

Control Method: Wireless
Compatibility: eR9 TT-specific setups
Speed Compatibility: 10–12-speed
Material: Composite
Weight: 40g
Notes: Lightweight wireless module for cockpit inputs

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: Compact and optimized for aero cranksets

Rear Derailleur

Model: RD-R8301

Speed Compatibility: 10–12-speed
Max Cassette Range: 11T–32T
Cage Length: Medium (93mm)
Material: Aluminum (main + cage)
Weight: 292g
Features: Compact design with reliable shifting performance

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: Serial Channel bleed routing for sleek cabling

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
Weight: 385g ±5g
Features: Aero-optimized stiffness with ultralight design

ZRACE RT-RX Disc Brake Rotors

Material: Stainless Steel + Aluminum Bracket
Size: 160mm
Weight: 111g (Center Lock) / 126g (6-Bolt)
Features: Vented structure for consistent braking in high heat

ZRACE Chain (Included Free)

Speed: 12-speed compatible
Weight: 271g (126 links)
Color: Silver
Features: Low-friction finish for extended life and smooth 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

For the 28.99mm axle carbon crankset, choose one:

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

Why Choose This Groupset?

The 2025 LTWOO eR9 TT + ZRACE UNCHAINED Groupset combines high-performance wireless shifting with lightweight carbon construction. Designed for serious triathletes and time trial riders, this package delivers optimized power transfer, seamless shifting, internal hydraulic routing, and compatibility with modern wide-range cassettes—all with a focus on aerodynamic advantage and cockpit simplicity.

What’s Included in the Box?

LTWOO eR9 TT Wireless Blip Levers (BL-R8001)
eR9 TT 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 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 to race at your highest level? Equip your triathlon or TT bike with the 2025 LTWOO eR9 TT + ZRACE UNCHAINED groupset and unleash pure aerodynamic power.