The Ghost Cat F4X Pro is an electric bike that redefines power, speed, and versatility. Designed with a robust build and advanced features, it’s one of the wildest eBikes available today, especially with the optional “beast mode” upgrade. Whether you’re a commuter, an off-road enthusiast, or simply someone who loves thrilling rides, the F4X Pro offers a unique blend of performance and comfort.

In this comprehensive review, we’ll explore everything from the bike’s specifications, pedal assist levels, battery capabilities, and off-road performance, to the all-important beast mode upgrade that transforms this bike into a true powerhouse.

Class 2 and Class 3 Capabilities

The F4X Pro ships as a Class 2 eBike, allowing speeds up to 20 mph via throttle, with five levels of pedal assist and a cadence sensor. For riders seeking higher speeds, it can be unlocked to Class 3, increasing the throttle speed to 28 mph.

With beast mode installed, which requires a controller upgrade done by Ghost Cat, the bike’s performance ramps up dramatically, allowing speeds well beyond the stock settings.

Lightweight Yet Durable Design

Weighing in at just 86 pounds, the F4X Pro supports a maximum payload capacity of 330 pounds. This lightweight design combined with a powerful motor makes it nimble and responsive, yet capable of handling heavy riders and cargo.

Multiple Color Options

The bike comes in seven eye-catching colors: army green, blackout, white, burnt orange, dark purple, neon green, and red. This range allows riders to personalize their ride to match their style.

Motor and Torque

At the heart of the F4X Pro is a 60V 2200W Hentac rear hub motor, boasting a peak power output of 3,300 watts and delivering a hefty 160 Newton meters of torque. This powerful setup ensures exceptional acceleration and hill-climbing ability.

Transmission and Pedaling

The bike features a single-speed transmission with a 40-tooth chainring and a full twist throttle. While it is pedal-assist capable, the F4X Pro is not designed primarily for pedaling, rather it excels with motor power.

Battery Life and Charging

The F4X Pro uses a massive 60V 25Ah battery with 1,500 watt-hours of power. Riders can expect up to 50 miles of range using pedal assist and about 35 miles on throttle alone. The battery is removable and comes with two straps for secure off-road use.

A 4-amp charger is included, allowing a full charge in approximately 7 hours. The battery also features an easy-to-read indicator and a USB charging port for mobile devices.

Front Suspension

Ghost Cat’s dual crown inverted forks provide 120 mm of travel, with adjustable compression and rebound. The inverted design means all movement occurs at the bottom of the forks, protected by sturdy guards.

Rear Suspension

The rear suspension by KK features 85 mm of travel and adjustable compression and rebound, with a 550-pound spring customizable via a spanner tool. This setup offers excellent shock absorption for both street and light off-road terrains.

Tires

Standard bikes come equipped with CST Scout 20×4 inch tires optimized for street use. Upcoming models will feature Maxis knobby tires, better suited for off-road adventures.

Handlebar Controls

• Left side: Rear brake lever (unusually located here, requiring adjustment for riders used to front brake on left)
• Right side: Front brake lever and full twist throttle

Display Panel

The full-color display shows:

• Battery level and voltage
• Current speed and wattage output
• Pedal assist level
• Odometer, max speed, average speed, and trip time (toggle via the “I” button)
• Headlight status

Advanced Settings

Users can access advanced menus by entering a password (default: 2000) to customize:

• Wheel size (stock 23 inches)
• Max speed (up to 49 mph)
• Pedal assist levels (configurable from 0-5, 1-5, or 0-9)
• Current limit (20 amps stock, upgradeable to 55 amps for beast mode)
• Pedal assist delay and power
• Drive mode (pedal assist only, throttle only, or both)
• Units (miles or kilometers)
• Password protection and factory reset

Commuter Performance

The F4X Pro excels as a city commuter bike, especially when tuned to lower amperage modes for safer and more controlled rides. The adjustable pedal assist allows smooth acceleration, and the hydraulic brakes with 203 mm rotors provide confident stopping power.

The bright Star Union headlight and rear brake light enhance safety during night rides.

Off-Road Capabilities

The suspension system smooths out rough terrain effortlessly, making the F4X Pro a capable off-road machine. Though the stock CST Scout tires are street-oriented, the bike still handles sand, dirt, and light trails effectively. The upcoming Maxis tires promise to elevate off-road performance further.

Power and Speed Testing

• Stock mode (20 amps): Top speeds hover around 29-30 mph.
• Beast mode (55 amps): Top speeds increase dramatically, reaching up to 41 mph.
• Acceleration in beast mode is aggressive, pulling the front wheel easily and requiring cautious handling.
• The bike climbs steep hills with ease, even at lower pedal assist levels in beast mode.

Brake Performance

• At 20 mph (Class 2 mode), the bike stops within approximately 21.5 feet.
• At 28-29 mph (Class 3 mode), stopping distance extends to around 50 feet.
• The hydraulic brakes are effective but require acclimation due to the unique brake lever placement.

Battery Life and Range Insights

I experienced a battery cutoff at about 51 volts after intense riding, including sand tests and hill climbs, indicating reliable battery protection.

While beast mode drains the battery faster due to increased power output, the large battery capacity ensures decent range even during aggressive riding.

Seat Upgrade

An optional Tapia seat is available for $325, offering enhanced comfort and personalized styling. The reviewer’s custom seat honored military service with unique stitching and patches, highlighting the bike’s potential for personalization.

Handlebar Adjustments

Handlebars can be moved inward or outward slightly, improving rider ergonomics.

Additional Accessories

• Plastic dirt bike-style fenders
• Aluminum pedals
• Double-sided chainring guard
• Passenger pegs
• Rock Bros storage bag with clear phone cover

Who Should Buy the Ghost Cat F4X Pro?

Ideal Riders

• Experienced eBike riders seeking high torque and speed
• Commuters wanting a powerful, durable bike with off-road flexibility
• Adventure enthusiasts looking for a lightweight yet rugged electric bike

Considerations

• Not recommended for beginners due to powerful acceleration and torque
• Requires adjustment period for brake lever placement and throttle control
• Stock tires limit extreme off-road use until upgraded to knobby Maxis tires
• High speeds and beast mode require responsible riding and safety gear

Final Thoughts

The Ghost Cat F4X Pro is a thrilling and versatile electric bike that blends the power of a dirt bike with the convenience of pedal assist. Its standout features include the beast mode upgrade, robust suspension, and long-range battery.

While it demands respect due to its power and unique handling characteristics, the F4X Pro rewards riders with exhilarating performance and rugged capability. Whether cruising city streets, tackling hills, or venturing off-road, this bike is engineered to impress.

For those who want a fast, fun, and customizable eBike experience, the Ghost Cat F4X Pro is a compelling choice.