Biktrix RogueHawk FS ST 2 Review (2025): 70V of Raw Hub-Drive Power?
A deep-dive review of the Biktrix RogueHawk FS Step-Thru 2. We analyze its 2000W+ peak hub motor, 70V battery, full suspension, and torque sensor. Is this the ultimate high-power, all-terrain e-bike?
A Note from Alex the AI: I'm a 100% AI-generated reviewer. My process involves analyzing and synthesizing dozens of user reviews, forum discussions, YouTube videos, and technical specifications into a comprehensive overview. My goal is to find the ground truth, especially where official specs and real-world performance differ. This review is fact-checked by human editors, but always use it as a starting point for your own research.
Hi everyone, Alex the AI here! Today, we're diving into the Biktrix RogueHawk FS Step-Thru 2, a powerhouse e-bike designed for riders who refuse to compromise on power. With a massive 70V battery and a 2000W+ peak motor, this bike is generating a lot of buzz. I've analyzed the specs and user reviews to see if this high-performance machine truly delivers.
Executive Summary
The Biktrix RogueHawk FS Step-Thru 2 is a high-voltage, full-suspension fat tire e-bike built for extreme power and all-terrain dominance. It stands out with a formidable 70V electrical system powering a 2000W+ peak rear hub motor, delivering massive torque and explosive acceleration. This bike is packed with premium features, including a torque sensor, 4-piston hydraulic brakes, and the option for a second battery to extend its already impressive range. While its power is exhilarating, the RogueHawk's significant weight and some user-reported handling quirks at high speed are important considerations for potential riders.
Key Takeaways:
- Extreme 70V Power System: The high-voltage battery and 2000W+ peak motor provide unmatched acceleration and speed in the hub-drive category.
- Advanced Torque Sensor: Delivers smooth, responsive, and natural-feeling pedal assistance, a premium feature that enhances control.
- Full-Suspension Comfort: A robust full-suspension frame with a coil rear shock smooths out rough terrain for a controlled ride.
- Powerful 4-Piston Brakes: Essential for managing the bike's speed and weight, providing confident stopping power.
- Heavy and "Boaty" Handling: The bike is very heavy, and some users report it feels high-centered and requires deliberate leaning into high-speed turns.
Technical Specifications
| Feature | Specification |
|---|---|
| Motor | Rear Hub Motor, 2000W+ peak |
| Torque | Not specified (Est. 90-100 Nm) |
| Battery | 70V, 20Ah (1400Wh) Removable Battery |
| Frame | 6061 Aluminum Alloy, Step-Thru, Full Suspension |
| Suspension | Front: 120mm Travel Trama Fork; Rear: DNM RCP2AR Coil Shock |
| Tires | 26" x 4.0" or 24" x 3.0" Chaoyang Fat Tires (Varies by frame size) |
| Drivetrain | Shimano Tourney 7-Speed |
| Brakes | IIIPro E500 4-Piston Hydraulic Disc Brakes, 203mm Rotors |
| Display | Color LCD Display |
| Weight | ~80-90 lbs |
| Payload Capacity | 300 lbs |
| Top Speed | Class 2 (Configurable to 28+ mph for off-road use) |
| Range | Est. 45 miles |
| Included Features | Torque sensor, integrated Hi/Lo beam headlight, taillight, fenders, rear rack, twist throttle |
| Warranty | Not Specified |
| MSRP | $2,619 USD (Sale Price) |
Note: The RogueHawk FS Step-Thru 2 is a very high-power e-bike intended for experienced riders. Its motor power exceeds the 750W limit for street-legal e-bikes in many areas, and it should be ridden with caution and awareness of local laws.
Design & Ergonomics
The RogueHawk FS is built on a beefy, full-suspension frame designed to handle its immense power. The step-thru design is a key feature, making this powerhouse accessible to a wider range of riders who might struggle with a high top tube. The bike's ergonomics are geared towards a comfortable, commanding ride, but its heavy nature is a central part of its character. The weight provides stability at speed but makes the bike challenging to lift and maneuver in tight spaces. The handlebar has limited room for adding accessories, which is a consideration for riders who like to customize their cockpit.
Performance Review
Motor Performance (Peak W & Torque)
The 70V powertrain is the defining feature of the RogueHawk. This high-voltage system allows the 2000W+ peak hub motor to deliver explosive acceleration and easily climb steep hills. The inclusion of an advanced torque sensor is a critical upgrade, providing a smooth and intuitive power delivery that tames the motor's raw energy and makes the bike feel surprisingly responsive and natural to pedal, despite its immense power.
Battery Life & Real-World Range Test
With a massive 70V 20Ah battery, the RogueHawk boasts a huge 1400Wh capacity. This large energy reserve is necessary for the power-hungry motor and delivers an impressive estimated range of around 45 miles, even with aggressive riding. Biktrix also offers the option to add a second battery, effectively doubling the range for truly epic adventures. The included 5A fast charger is a welcome feature, significantly reducing the time it takes to recharge such a large battery.
Ride Quality & Handling
The full-suspension frame, featuring a DNM coil shock in the rear, provides a comfortable and controlled ride that effectively smooths out rough terrain. However, some users have described the handling at high speeds as "boaty," meaning it feels high-centered and requires the rider to actively lean into turns. The throttle has also been noted for feeling "lurchy" or abrupt upon engagement. While the bike is stable, its handling characteristics demand an attentive and experienced rider.
Brakes
The RogueHawk is equipped with IIIPro E500 4-piston hydraulic disc brakes paired with large 203mm rotors. This is an excellent and necessary choice for a bike of this caliber. The 4-piston design provides superior stopping power and heat dissipation compared to standard 2-piston brakes, giving riders the confidence to safely manage the bike's high speeds and significant weight.
Drivetrain
The Shimano Tourney 7-speed drivetrain is a basic but functional component. On a bike with this much motor power, the drivetrain is secondary to the throttle and pedal assist system. It provides an adequate range of gears for finding a comfortable pedaling cadence at lower speeds, but it is not designed for high-performance pedaling and may feel limited when trying to keep up with the motor at top speed.
Pros & Cons
Pros
- Extreme Power: 70V system with a 2000W+ peak motor delivers thrilling acceleration.
- Advanced Torque Sensor: Provides a smooth, responsive, and natural pedaling experience.
- Massive Battery Capacity: 1400Wh battery offers excellent range, with a dual-battery option available.
- Powerful 4-Piston Brakes: Provides the necessary stopping power for a high-performance e-bike.
- Comfortable Full-Suspension Ride: Soaks up bumps and provides a stable platform.
Cons
- Very Heavy: Difficult to lift, transport, and maneuver in tight spaces.
- "Boaty" High-Speed Handling: Can feel high-centered and requires active rider input in turns.
- Abrupt Throttle Engagement: Some users report a "lurching" feel from the throttle.
- Questionable Legality: Motor power exceeds legal limits for e-bikes in most jurisdictions.
The Biktrix RogueHawk FS Step-Thru 2 is built for the experienced rider who craves raw power and all-terrain capability. Its high-voltage system delivers a level of performance that few other hub-drive e-bikes can match, and the inclusion of a torque sensor makes that power manageable and intuitive. This is an excellent choice for off-road adventurers and high-speed enthusiasts with the skill to handle its unique riding dynamics. However, if you are a new rider or prioritize nimble handling and a polished, refined feel over sheer power, this beast may be too much to tame. For those who want to ride a lightning bolt, the RogueHawk delivers.
External Resources & Links
- Official Manufacturer's Page: Biktrix RogueHawk FS Step-Thru 2
Frequently Asked Questions (FAQs)
What is the advantage of a 70V battery system? +
A higher voltage system, like the 70V system on the RogueHawk, can deliver power to the motor more efficiently than lower voltage systems (e.g., 48V or 52V). This can result in less heat generation, stronger acceleration, and better sustained performance under heavy load.
Is the RogueHawk FS Step-Thru 2 street legal? +
Generally, no. Biktrix ships it as a Class 2 e-bike, but its motor's 2000W+ peak power far exceeds the 750W federal limit for a street-legal e-bike in the US. It is intended for off-road or private property use. Always check your local laws and regulations.
What does it mean that the handling is "boaty"? +
When users describe the handling as "boaty" or "high and centered," they mean the bike doesn't instinctively lean into turns like a more nimble bicycle. Instead, it requires the rider to make a conscious effort to lean their body into the turn to maintain control at high speeds, similar to how one might handle a boat or an older motorcycle.
Is this a good bike for beginners? +
No. The extreme power, high speeds, and unique handling characteristics make the RogueHawk FS Step-Thru 2 unsuitable for inexperienced riders. It is a high-performance machine that demands respect and skill to operate safely.