Sizzlebk S320: A Surprisingly Light Cargo Bike That Can Haul 500 lbs

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Cargo e-bikes are often big, heavy, and intimidating—but the Sizzlebk S320 manages to balance hauling power with a frame that feels surprisingly light. With a rated 500 lb capacity, hydraulic brakes built to handle serious weight, and an extended rear cargo rack, the S320 feels more like the SUV of e-bikes—only lighter on its feet.

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Key Features & Specifications

Spec	Details
Motor	1300W peak hub motor, 90 Nm torque
Battery	48V 15Ah removable pack
Range	~22 miles real-world without cargo
Top Speed	28 mph (unlocked)
Frame	Aluminum alloy (lightweight for a cargo bike)
Cargo Capacity	500 lbs (rack supports riders or heavy loads)
Tires	20” x 3” Chaoyang
Brakes	Radius hydraulic discs, 180mm rotors
Drivetrain	Shimano 7-speed
Suspension	Zoom Mera front fork, preload + lockout
Weight Limit	500 lbs total load
Extras	Folding handlebars, center stand, passenger seat option, headlight & taillight
Price	~$1,500 (at time of review)

Build and Components

The first impression of the S320 is that it feels sturdy without being overbuilt. Thanks to its aluminum frame, the bike stays relatively light for a cargo model, making it easier to maneuver than many steel-frame alternatives.

Key components include:

Frame: Aluminum, lightweight yet strong
Tires: 20” x 3” Chaoyang (narrower than 20×4 fat tires, but efficient for city use)
Brakes: Radius hydraulic discs, 180mm rotors (front & rear)
Suspension: Zoom Mera front fork with preload and lockout
Battery: 48V 15Ah removable pack
Motor: 1300W peak hub motor, 90 Nm torque
Drivetrain: Shimano 7-speed
Extras: Folding handlebars, adjustable stem, center stand, front rack mounting points

The cargo rack is extra long, easily double the size of a standard e-bike rear rack. It can be fitted with a padded passenger seat, running boards, or even a cage for kids—though not all accessories are included out of the box.

Ride Experience

The S320 is built to carry weight without complaint. Whether loaded with cargo or carrying passengers, the 1300W motor pulls confidently, reaching a top speed of 28 mph once unlocked. Acceleration feels peppy for a cargo bike, and while it’s not built for off-road use, it handles grass and uneven ground better than expected.

The rear end rides smoother than you’d think for a hardtail. Somehow, the geometry and fat 3-inch tires give it a soft, almost suspended feel in the back. The front suspension fork does its job soaking up road chatter, though the bike is clearly designed more for utility than trail riding.

Braking is a highlight—the Radius hydraulics feel powerful and responsive, with adjustments that allow fine-tuning as pads wear. For a bike meant to carry 500 lbs, this level of stopping power is essential.

The Good

500 lb Cargo Rating: Hauls people, groceries, or deliveries with ease.
Lightweight for Class: Aluminum frame keeps it surprisingly manageable.
Powerful Motor: 1300W peak with 90 Nm torque is plenty for hauling.
Strong Brakes: Radius hydraulics feel premium and inspire confidence.
Expandable Rack: Huge rear area for passengers or cargo setups.

The Not-So-Good

Assembly: Tricky, especially the front fork install.
Gear Shifting: Needs adjustment out of the box (struggles with 1st & 7th).
Limited Accessories Included: Passenger cage/running boards not in the box.
Knobby Tires Are Loud: Great grip, but noisy on pavement.

Verdict

The Sizzlebk S320 is the rare cargo bike that feels both strong and light. Its 500 lb capacity puts it far above typical e-bikes in hauling ability, while the aluminum frame and thoughtful design keep it approachable for everyday riders. At $1,500, it’s not the cheapest, but for delivery workers, families, or anyone who wants a true utility e-bike, it’s an investment that makes sense.

Get the best price on the S320 here with code “AMPED“

Think of it as the minivan of e-bikes—practical, reliable, and ready to carry whatever life throws at it.

Looking for more e-bike reviews? Check out our latest guides on Amped Cycle for expert insights on electric bikes and PEVs!

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