The HeyBike Mars 3.0 is the latest fat tire folding electric bike from HeyBike’s new X series. Positioned as a pinnacle of fat tire eBikes, this model combines powerful specs, advanced features, and portability. This review dives deep into its specifications, riding performance, and usability to help you determine if it’s the perfect fit for your urban and off-road riding needs.

Class and Speed Modes

The Mars 3.0 is shipped as a Class 2 eBike, capable of reaching speeds up to 20 mph using a half-twist throttle located on the right handlebar. It also features a torque sensor and five levels of pedal assist to customize the riding experience. For riders seeking higher speed, the bike can be unlocked to Class 3 speeds, achieving up to 28 mph, with a special feature allowing speeds beyond that.

Weight and Payload

At 70 pounds, the Mars 3.0 is relatively lightweight for a fat tire eBike and supports a maximum payload of 440 pounds, making it suitable for a wide range of riders and gear.

Pricing and Warranty

As of the review, the Mars 3.0 is priced at $1299 and includes a 2-year warranty, offering strong value for an eBike in this category.

Color Options

The bike is available in three colors: Vivid Orange (reviewed model), Night Rider Black, and Stormy Blue, allowing riders to choose a style that fits their preference.

Frame and Folding Mechanism

The Mars 3.0 is a folding bike, making storage and transport easier. Folding it involves lowering the stem and folding the frame back onto itself. When folded, the bike measures 38 inches long, 33 inches tall, and 19.7 inches wide.

Size and Fit

• Overall length: 66.9 inches
• Adjustable stem and seat post
• Recommended rider height: 4’11” to 6’2”

The bike accommodates a variety of rider sizes, with a telescopic stem and quick-release seat post for easy adjustments.

Motor Specifications

Powered by a 48V 750W Galaxy E-drive motor, the Mars 3.0 delivers a peak power output of 1400W and 95 Nm of torque, providing ample power for city commuting and off-road trails.

Transmission System

Equipped with an 8-speed Shimano Altus derailleur, a 48T chainring, and an 8-speed thumb shifter, the bike offers smooth gear changes for varying terrains and rider preferences.

Battery and Range

• Battery: 48V, 13Ah (624Wh), integrated into the down tube
• Charging: Removable battery with a 2A charger, charging time approx. 6.5 hours
• Range: Up to 65 miles on a single charge (dependent on riding conditions and assist level)

The battery can be charged on or off the bike, offering flexibility for users.

Suspension Setup

• Front fork: Hydraulic with 50 mm travel, preload adjustment, and lockout feature
• Middle suspension: Rhost link suspension with 30 mm travel

This full suspension setup enhances comfort and control over rough terrain.

Tires

The Mars 3.0 features 20” x 4” Chao yang fat tires with a multi-terrain tread pattern. These tires are puncture resistant, designed to handle both paved roads and rugged off-road conditions.

Braking System

The bike is equipped with two-piston hydraulic brakes paired with 180 mm rotors on both wheels, providing strong and reliable stopping power. While the tires may cause some rear wheel kickout under hard braking, overall control remains solid.

Handlebar Controls

• Left side: Front brake lever, turn signals, horn, and full-color display
• Right side: Half-twist throttle, rear brake lever, and gear shifter

Display Features

The color display shows battery voltage, speed, watt output, pedal assist level, trip data (distance, time, average/max speed), and odometer. It supports two NFC keys or password entry to power on.

Pedal Assist and Throttle

The bike offers five pedal assist levels (Eco, Tour, Standard, Sport, Turbo) adjustable via buttons. The throttle can be set to function independently or only with pedal assist.

Lighting and Signals

Both front and rear lights integrate turn signals, brake lights, and headlights. While turn signals activate via buttons on the left grip, the display does not visually indicate when they are active, requiring rider awareness.

Hey Bike Mobile App

The HeyBike app enhances the riding experience by offering:

• Real-time ride tracking and trip data
• Battery status and recent ride summaries
• Firmware updates and bike customization options
• Color personalization of the bike’s display
• Adding multiple riders and managing account settings

The app syncs seamlessly with the Mars 3.0, allowing riders to fine-tune settings on the fly.

On-Road Performance

The Mars 3.0 rides smoothly on pavement, with fat tires providing stability and comfort. The torque sensor pedal assist offers a natural feel, delivering more power based on the rider’s pedaling force rather than fixed cadence levels.

Speed and Acceleration

• Throttle-only max speed: approx. 27 mph
• Pedal assist max speed (unlocked): up to 33 mph
• The bike accelerates quickly and maintains speed comfortably even on uphill climbs.

Off-Road and Trail Use

The full suspension and fat tires allow the Mars 3.0 to handle light to moderate off-road trails with ease. It performed well on gravel, dirt paths, and even challenging sandy terrains, though deep, loose sand presented some difficulty.

Hill Climbing

The motor’s torque and pedal assist levels make climbing steep hills (up to 20% grade) manageable both with pedal assist and throttle.

Suspension Comfort

The front hydraulic fork and mid-link suspension absorb bumps effectively. Tire pressure can be adjusted for additional comfort and control depending on terrain.

Battery Life and Range in Real Conditions

In mixed urban and off-road riding with frequent pedal assist use and hill climbs, the Mars 3.0 delivered approximately 27 miles before assist stopped due to low battery voltage. Under more moderate conditions, riders can expect 30–65 miles per charge.

Pros and Cons Summary

Pros

• Powerful 750W motor with 1400W peak power
• Full suspension for smooth rides on varied terrain
• Fat, puncture-resistant tires suitable for multi-terrain use
• Folding frame for portability and storage
• Advanced display with customizable settings
• Integrated turn signals and safety lighting
• Affordable price with a 2-year warranty

Cons

• Battery may rattle inside the frame (easy fix with weather stripping)
• Seat comfort is subjective; may require replacement for some riders
• 48T chainring is small for sustained high-speed riding; bigger ring recommended
• Turn signals lack display indicator
• Braking distance is longer due to tire tread and bike weight

Final Thoughts on the HeyBike Mars 3.0

The HeyBike Mars 3.0 stands out as a versatile fat tire folding eBike that balances power, comfort, and portability. Its torque sensor-driven pedal assist system provides a responsive and enjoyable ride, whether cruising city streets or tackling more rugged terrain. The bike’s price point and 2-year warranty add to its appeal for both new and experienced riders.

While there are areas for improvement—such as the seat comfort, chainring size, and minor battery rattling—these issues are either subjective or easily addressed. Overall, the Mars 3.0 offers a compelling package for riders seeking a robust, fun, and adaptable eBike.