EUY S4 Moped-Style Electric Bike – 1000W, 48V 25Ah, 20 x 4.0 Fat Tires

High-Power Moped-Style E-Bike with Long-Range Battery & Dual Suspension

The EUY S4 Moped Electric Bike combines the familiar riding experience of a moped-style frame with the efficiency and electric assistance of an e-bike. Designed for riders who want a comfortable, powerful, and versatile ride, the S4 features a 1000W rear hub motor, a large 48V 25Ah lithium battery, and wide 20 x 4.0-inch fat tires.

Its specialized frame and double-shock suspension design are built to provide a more comfortable ride across a variety of surfaces. With 5 levels of intelligent pedal assist, a twist throttle, Shimano 7-speed gearing, and hydraulic disc brakes, the EUY S4 is equipped for commuting, recreational riding, and longer-distance adventures.

Key Features

1000W Rear Hub Motor

The S4 is equipped with a 1000W rear hub motor rated at normal operating power, delivering strong electric assistance with up to 96 N·m of maximum torque.

48V 25Ah Long-Range Battery

The large 48V 25Ah lithium battery provides a claimed range of up to 100 miles, depending on riding conditions and usage. The battery weighs approximately 9.3 lbs and provides 1,200Wh of stated energy capacity.

28 MPH Top Speed

The EUY S4 has a claimed top speed of 28 mph, with the supplied specifications noting this as the legally required limit for U.S. use. Riders should verify applicable local regulations before operating the bike.

Intelligent 5-Level Pedal Assist

Five intelligent pedal-assist levels allow riders to adjust the amount of electric assistance according to their preferred riding style and conditions.

Twist Throttle

A twist throttle provides convenient motor control for effortless acceleration when throttle operation is permitted.

Dual-Crown Suspension Fork

The front suspension system uses a dual-crown fork with lockout and adjustment, helping absorb impacts and improve control over uneven surfaces.

20 x 4.0-Inch Fat Tires

Wide 20 x 4.0-inch fat tires provide a broad contact patch designed for enhanced stability and traction across a variety of riding environments.

Logan 180mm Hydraulic Brakes

The S4 features Logan 180mm hydraulic disc brakes for responsive braking performance. Grip-style brake levers incorporate motor cutoff switches for added control.

Shimano 7-Speed Drivetrain

A Shimano 7-speed gear system provides additional gearing flexibility for different speeds and terrain.

Comfortable Moped-Style Design

The specialized frame and dual-shock design create a more comfortable moped-style riding position. A soft PU shock-absorbing saddle and adjustable-height handlebar further support rider comfort.

Integrated LED Lighting

A 48V LED front light provides illumination for low-light riding, while the bike’s design includes visibility-oriented components for everyday use.

Specifications

Motor & Performance

Battery & Charging

Frame, Wheels & Fit

Drivetrain & Braking

Controls & Equipment

Ideal Applications

The EUY S4 is well suited for:

• Daily commuting
• Urban transportation
• Recreational riding
• Neighborhood and bike-path riding
• Longer-distance electric-assisted rides
• Outdoor adventures
• Riders seeking a moped-style e-bike experience

Rider Safety & Guidance

• Always wear a properly fitted helmet and appropriate protective equipment.
• Follow all applicable local e-bike, moped, and roadway regulations.
• Verify whether the S4’s 28 mph configuration is permitted in your area before riding.
• Do not exceed the 400 lb maximum load.
• Inspect the hydraulic brakes, tires, wheels, drivetrain, suspension, and electrical connections before each ride.
• Ensure the battery is securely installed before operating the bike.
• Use the front LED light and appropriate reflective equipment when riding in low-light conditions.
• Avoid riding in conditions that exceed the bike’s intended operating environment.
• Charge the battery using the supplied charger and according to the manufacturer’s instructions.
• Actual range will vary based on rider weight, terrain, speed, assist level, temperature, wind, road conditions, and battery condition.

Performance Notes

The supplied specifications list a 100-mile maximum range. This should be considered a claimed maximum figure rather than a guaranteed real-world range, as actual riding distance can vary significantly with rider weight, terrain, speed, temperature, assist level, and other conditions.

The stated 28 mph top speed is presented in the supplied specifications as a U.S. legal-limit configuration. E-bike classification and operating requirements can vary by jurisdiction, so riders should verify local requirements.

Why Choose the EUY S4?

The EUY S4 Moped Electric Bike combines a powerful 1000W rear hub motor, large 48V 25Ah battery, 20 x 4.0-inch fat tires, dual-shock comfort, hydraulic disc brakes, Shimano 7-speed gearing, and 5-level pedal assist in a distinctive moped-style package. With a 400 lb maximum load capacity and recommended rider height range of 5’7″–6’5″, it is designed for riders looking for a substantial, comfortable electric bike for everyday transportation and longer recreational rides.