Trek Rail 9.9 XX1 AXS Gen 4
Trek Rail 9.9 XX1 AXS Gen 4
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Trek Rail 9.9 XX1 AXS Gen 4
Product Introduction
The Trek Rail 9.9 XX1 AXS Gen 4 is one of Trek's flagship electric mountain bikes, engineered for riders seeking uncompromising performance on the most demanding trails. Combining an ultra-light OCLV Mountain Carbon frame with Bosch's renowned Performance Line CX motor and premium suspension, it delivers exceptional climbing power, descending confidence and all-day comfort.
Designed for aggressive trail riding, enduro adventures and alpine terrain, the Rail 9.9 features FOX Factory suspension, SRAM XX1 Eagle AXS wireless electronic shifting and Bontrager carbon wheels, offering world-class precision, durability and control.
Whether you're tackling technical singletrack, steep climbs or fast descents, the Rail 9.9 XX1 AXS Gen 4 provides outstanding performance with the latest premium components.
Key Features
- OCLV Mountain Carbon Frame
- Bosch Performance Line CX Smart System
- Bosch PowerTube 750 Wh Battery
- 250 W Motor
- 85 Nm Torque
- FOX 38 Factory Fork
- FOX Float X Factory Shock
- SRAM XX1 Eagle AXS Wireless Drivetrain
- Shimano XTR Hydraulic Disc Brakes
- Bontrager Line Pro 30 Carbon Wheels
- Internal Cable Routing
- Adjustable Geometry
Motor — Bosch Performance Line CX
- Bosch Performance Line CX Smart System
- 250 W Motor
- 85 Nm Torque
- eBike Flow App Compatible
- Smooth and Natural Pedal Assistance
- Assistance up to 25 km/h
Battery — Bosch PowerTube 750 Wh
- Fully Integrated
- Removable
- Long Range Performance
- Bosch Smart System Compatible
Frame — OCLV Mountain Carbon
- Lightweight Carbon Construction
- Internal Cable Routing
- Removable Integrated Battery (RIB)
- Adjustable Geometry (Mino Link)
- Knock Block Steering Protection
Suspension
Front Fork: FOX 38 Factory, 160 mm Travel
Rear Shock: FOX Float X Factory, 150 mm Travel
Drivetrain — SRAM XX1 Eagle AXS
- Wireless Electronic Shifting
- 12-Speed
- Carbon Crankset
- Ultra-Precise Gear Changes
Brakes — Shimano XTR Hydraulic Disc
- Four-Piston Calipers
- Powerful Braking
- Excellent Heat Management
Wheels — Bontrager Line Pro 30 Carbon
- Tubeless Ready
- 29" Front
- 29" Rear
Technical Specifications
| Frame | OCLV Mountain Carbon |
| Motor | Bosch Performance Line CX Smart System |
| Motor Power | 250 W |
| Torque | 85 Nm |
| Battery | Bosch PowerTube 750 Wh |
| Fork | FOX 38 Factory |
| Front Travel | 160 mm |
| Rear Shock | FOX Float X Factory |
| Rear Travel | 150 mm |
| Drivetrain | SRAM XX1 Eagle AXS |
| Brakes | Shimano XTR Hydraulic Disc |
| Wheelset | Bontrager Line Pro 30 Carbon |
| Wheel Size | 29" |
| Frame Material | Carbon |
| Weight | Approximately 22.8 kg (Size M, manufacturer claimed) |
Why Choose This Bike?
The Rail 9.9 XX1 AXS Gen 4 brings together an ultra-light OCLV Mountain Carbon frame, Bosch's Performance Line CX Smart System, FOX Factory-level suspension front and rear, and a fully wireless SRAM XX1 Eagle AXS drivetrain — a build that pairs flagship-level trail performance with genuine all-day comfort. For riders who want top-tier componentry on technical singletrack, steep climbs and fast descents alike, this is one of Trek's most capable electric mountain bikes.