EUYbike S4 Review: Why I Like This Moped-Style E-bike?


The EUYbike S4 is a high-performance and stylish e-moped that offers an exciting and enjoyable riding experience. With its powerful motor and impressive speed, the S4 delivers thrilling rides whether you’re navigating city streets or exploring off-road trails.

The full suspension system and comfortable seat ensure a smooth and comfortable ride, while the sleek design adds a touch of sophistication. With its combination of speed, style, and affordability, the S4 is a top choice for riders who crave both performance and aesthetics.

The EUYbike S4 is an exceptional e-moped that not only offers great features but also comes at an affordable price. With a retail price of $1,499, the S4 provides excellent value for riders looking for a high-quality electric-powered ride.

What makes the deal even better is the availability of a $100 off coupon, allowing riders to purchase the S4 at an even more enticing price. This discount brings the total cost down to $1,399, making it an even more affordable option in the e-moped market.

The EUYbike e-bike is not only seriously speedy but also boasts a stylish design that is sure to turn heads. This e-moped offers an incredible combination of speed, style, and affordability, making it a true steal for riders.

FrameHigh-Carbon Steel Frame
Hub Motor1000W rear hub motor
Max torque96 N.m
Top speed28MPH (legally required in US)
Tires20" x4.0" fat tires
FreewheelShimano 7 speed gear shift
BrakeLogan 160mm hydraulic brakes
Battery48V 25Ah lithium Panasonic battery
Range40~44miles (throttle)
Range70-75miles (pas)
DisplayLCD display
Front ForkDual crown suspension Fork with lockout and adjustment
ThrottleTwist throttle
Pedal AssistIntelligent 5 Pedal-Assist levels
Weight76 lbs (with battery)

Design and Build Quality

The EUYbike S4 is a moped-style electric bike that combines a stylish design with high-quality build materials and components. Its robust construction and attention to detail make it a reliable and enjoyable option for long journeys and everyday commuting.

One of the standout features of the S4 e-bike is its high-carbon steel frame. The frame provides excellent durability and strength, ensuring the bike can withstand various terrains and riding conditions. This material choice also adds a touch of ruggedness to the overall design, enhancing the moped-style aesthetic.

To ensure optimal braking performance, the S4 is equipped with Tektro 160mm hydraulic brakes. These hydraulic disc brakes offer reliable stopping power and excellent modulation, allowing riders to have precise control over their speed. Whether you’re cruising through city streets or exploring off-road trails, the braking system on the S4 ensures safety and confidence.

The S4 e-bike features an alloy front suspension fork with lockout and adjustment capabilities. This fork helps absorb shocks and vibrations, providing a smoother and more comfortable ride. Whether you encounter bumps on the road or uneven terrain, the suspension fork helps to minimize the impact and enhances overall ride quality.

Another notable feature of the S4 is its 20″x4″ fat tires. These wide and thick tires offer excellent traction and stability, making them ideal for various surfaces such as gravel, sand, or snow. The fat tires not only provide a comfortable ride but also contribute to the bike’s off-road capabilities, allowing riders to explore different terrains with ease.

To further enhance the comfort and performance of the S4, it incorporates full suspension, including a single-shock rear suspension. This rear suspension system absorbs shocks and vibrations from the road, minimizing fatigue and providing a smoother riding experience. Whether you’re tackling urban streets or hitting rough trails, the full suspension setup ensures that your ride remains enjoyable and comfortable.

The S4 e-bike features a black-and-white LCD display that provides riders with essential information such as speed, battery level, and distance traveled. This display is easy to read, even in different lighting conditions, allowing riders to stay informed and in control of their ride.

In terms of convenience, the S4 features a thoughtfully designed control panel located on the left handlebar. This control panel puts all the essential functions within easy reach. From this centralized location, riders can access and control the bike’s various features. The buttons for lights and horns are also conveniently placed on the left handlebar, allowing riders to operate them without taking their hands off the grips. This arrangement ensures that riders can maintain control and focus on the road while still accessing the necessary functions of the bike.

The S4 e-bike boasts impressive weight specifications, making it a robust and capable electric bike. With a claimed weight of 76 lbs, the S4 strikes a balance between sturdy construction and manageable weight for riders. Furthermore, the S4 offers a generous total payload capacity of 400 lbs. This capacity refers to the combined weight of the rider, cargo, and any additional accessories. 

The EUYbike S4 e-bike not only excels in its design and performance but also pays attention to rider comfort and convenience. One of the key elements contributing to rider comfort is the S4’s well-designed saddle. The saddle strikes the perfect balance between support and cushioning, ensuring a comfortable ride even during long journeys. Whether you’re commuting to work or embarking on an adventure, the S4’s saddle provides a cozy and enjoyable seating experience.

In terms of aesthetics, the S4 embraces its moto/moped styling with a dual crown suspension fork and a giant headlight. These design elements add a touch of uniqueness and give the bike an unmistakable presence on the road. The dual crown suspension fork not only adds to the visual appeal but also provides additional strength and rigidity to the front end of the bike.

Motor and Driving

The EUYbike S4 e-bike is equipped with a powerful 1000W rear-hub motor, ensuring thrilling and exhilarating rides. This motor provides impressive performance and acceleration, allowing riders to experience the thrill of electric-powered speed. Whether you prefer using the throttle or engaging the pedal assist system, the S4 delivers a dynamic and exciting riding experience.

With a peak torque of 96 Nm, the S4 e-bike boasts exceptional power, enabling riders to conquer various terrains and inclines with ease. Whether you’re climbing hills or accelerating quickly from a standstill, the motor’s torque ensures a smooth and responsive ride.

The S4 features a 5-stage pedal assist system (PAS), providing riders with different levels of assistance to suit their preferences and riding conditions. The PAS enhances the overall riding experience by providing additional power when needed while still allowing riders to contribute their own effort. This feature allows for a customizable riding experience, catering to different fitness levels and terrain challenges.

Comfort is a key consideration in the design of the S4, and the padded seat and full suspension play a significant role in providing a comfortable cruising experience. The padded seat ensures that riders can enjoy longer journeys without discomfort or fatigue. The full suspension system, including the front suspension fork and single-shock rear suspension, effectively absorbs shocks and vibrations, providing a smooth and comfortable ride even on uneven terrain.

The Shimano 7-speed drivetrain is another noteworthy feature of the S4 e-bike. This drivetrain allows riders to manually contribute their effort and adjust the bike’s speed according to their preferences. With the 7-speed options, riders can easily find the right gear for different riding conditions, optimizing their efficiency and comfort. This drivetrain is particularly useful when riding at speeds around 22 mph, where the rider’s effort is combined with the motor’s power for a balanced and engaging ride.

As is common with many moped-style e-bikes that exceed 20 mph, the S4 utilizes a cadence sensor. This sensor keeps the motor engaged as long as the pedals are in motion, ensuring a consistent and continuous power delivery. Whether you’re pedaling lightly or applying more force, the motor remains responsive and provides seamless assistance.

To add to the versatility and ease of use, the S4 features a twist throttle. This throttle allows riders to engage the motor effortlessly, providing instant acceleration and control. With the twist throttle, riders can easily reach their desired speed or apply bursts of power when needed, adding an extra level of excitement to their rides.

During a test of the EUYbike S4 e-bike’s climbing capabilities, the performance in both throttle-only and pedal-assist modes was observed. When relying solely on the throttle power, the bike smoothly ascended to the summit in a leisurely 1 minute and 38 seconds. Throughout this ascent, the S4 maintained an average speed of 11 miles per hour.

In comparison, when engaging the pedal assistance at its highest level, PAS 5, the S4 showcased its agility and power. The bike accelerated up the hill, reaching the summit in a quicker time of 1 minute and 12 seconds. The average speed during this climb was notably faster, at 14.3 miles per hour.

The results demonstrate the effectiveness of the S4 e-bike’s pedal assist system, allowing riders to conquer inclines with ease and efficiency. With the added assistance of the motor and the option to adjust the level of assistance, riders can tailor their riding experience to match their desired speed and effort level.

The EUYbike S4 is designed to excel in off-road adventures, offering riders a capable and comfortable experience. This is made possible by the bike’s robust features, including a suspension fork, rear mono shock, and knobby fat tires.

Comfort is a priority for the S4, especially during long journeys. The bike features a big and squishy seat that provides ample cushioning and support. This comfortable seat allows riders to spend extended periods in the saddle without discomfort or fatigue. Whether you’re embarking on a multi-hour exploration or simply enjoying a leisurely ride, the S4’s seat ensures a plush and enjoyable experience.

Furthermore, the combination of the big, squishy seat and the full suspension system enhances rider comfort even further. The seat works in tandem with the suspension, absorbing vibrations and impacts, and delivering a remarkably comfortable ride. This combination allows riders to embark on long journeys, knowing that they can enjoy the adventure without sacrificing their comfort.

Battery and Range

The EUYbike S4 e-bike is equipped with a high-capacity lithium battery that ensures an extended riding range. The standard battery option is a 48V 25Ah lithium battery, although it’s worth noting that some variations may come with a 20Ah battery.

With the 48V 25Ah lithium battery, the S4 offers an impressive range for riders to enjoy. When utilizing the throttle-only mode, riders can expect a range of approximately 40-44 miles on a single charge. This range allows for exciting and leisurely rides, providing ample distance for exploring urban landscapes or venturing into nature.

For those who prefer to engage the pedal-assist system (PAS), the S4 extends its range even further. With PAS activated, riders can experience a range of approximately 70-75 miles on a single charge. The pedal-assist feature provides additional power to the rider’s pedaling efforts, resulting in increased efficiency and extended battery life.

During our testing, we conducted distance measurements to determine the range of the EUYbike S4 e-bike in different pedal-assist modes. The results showed that the bike offered respectable distances in both PAS 5 and PAS 1 modes.

In PAS 5, which provides the highest level of assistance, we measured a distance of approximately 29 miles. This mode delivers a significant boost to the rider’s pedaling effort, allowing for swift acceleration and easier uphill climbs. With the assistance provided by PAS 5, riders can cover a considerable distance before needing to recharge the battery.

In PAS 1, the lowest level of assistance, we observed an even greater range. Riders can expect to travel around 47 miles on a single charge when using this mode. Although the assistance in PAS 1 is more subtle compared to higher levels, it still offers a helpful boost that allows riders to maintain a comfortable pace with less effort. This mode is ideal for conserving battery power and maximizing the overall range of the bike.


The EUYbike S4 e-bike offers a commendable level of flexibility and customization through its settings menu, providing riders with the ability to personalize their riding experience. The inclusion of features such as speed limitation and the option to deactivate the throttle allows riders to adapt the bike to their specific preferences and local regulations. This level of customization is appreciated by riders who desire more control over their e-bike’s performance.

One of the standout features of the S4 is its full suspension system, which contributes to a casual, comfortable, and smooth ride. The inclusion of both a suspension fork at the front and a rear mono shock ensures that the bike effectively absorbs shocks and vibrations from various terrains. Whether you’re riding on bumpy city streets or venturing off-road, the full suspension system helps maintain stability and provides a plush riding experience.

So, the S4 e-bike strikes a balance between affordability and performance, making it an enticing option for those seeking an e-moped that offers value for money. It allows riders to experience the thrill and convenience of an electric-powered ride without breaking the bank.

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