A fat tire electric bike is an e-bike equipped with oversized tires—typically 3.8 inches or wider—designed to provide extra stability, traction, and comfort across a wide range of terrain. The combination of powerful electric assist and wide tires allows riders to easily navigate sand, snow, gravel, or rough trails where standard bikes might struggle. These bikes are known for their confidence-inspiring ride, plush feel, and go-anywhere versatility, making them a favorite among adventure seekers, commuters in all-weather conditions, and riders who simply want a smooth, stable ride.
The "20-inch Powerhouse."
The Wired Viper is the compact, step-through sibling to the legendary Wired Predator. While it shares the same high-performance DNA, the Viper utilizes a smaller wheel platform to achieve what Wired claims is the highest torque output of any Power Performance Bike (PPB) on the market. It is designed for riders who want elite-level power in a more accessible, maneuverable frame.
Key Performance Specs
- Powertrain: Dual-motor 72V All-Wheel Drive (AWD)
- Peak Power: 8000W
- Top Speed: 50+ MPH
- Torque: 430Nm (Combined)
- Battery: 72V Dual Battery System
- Price: $3,699 MSRP
The "Physics" of Power
The standout feature of the Viper is its 20-inch wheel platform. Because it uses the exact same motors, controllers, and 72V batteries as the larger Predator but pairs them with smaller wheels, it gains roughly 30% more effective torque at the ground. This results in explosive off-the-line acceleration, surgical low-speed control, and industry-leading hill-climbing capabilities.
Design & Build
Unlike many high-performance bikes that require a high stand-over height, the Viper features a step-through frame. This makes it a "confidence-inspiring" option for a wider range of rider heights without sacrificing the "brutality" of the AWD system. It is positioned not as a "mini" bike, but as a refined, more compact version of Predator-class power.
Important Considerations for Buyers
- Classification: Wired classifies this as a Power Performance Bike (PPB) rather than a traditional e-bike. Due to the 50+ MPH top speed and 8000W output, it exceeds standard Class 1, 2, or 3 e-bike regulations in many jurisdictions.
- Availability: Currently available for pre-order
- Support: Wired is an American-owned company headquartered in Mundelein, Illinois, providing U.S.-based customer support.
The Verdict (Pre-Review)
The Wired Viper is built for the "torque junkie." It’s a niche machine that prioritizes mechanical leverage and traction over all else. If you are looking for a step-through that can out-climb almost anything on two wheels and hits 50 MPH, the Viper stands alone in its category.
The Wired Warrior is a "Clark Kent" style power performance machine that packs a massive 72V system and an exclusive 5000W peak motor into a full-size, stable frame. While it looks like a premium fat-tire bicycle, our testing proved it is a high-speed monster capable of hitting a GPS-verified 52 mph and demolishing steep hills that would stall most competitors. It balances this raw, "unhinged" acceleration with expert-level safety features like 10-gauge spokes and a 56T chainring to prevent ghost pedaling, making it the definitive choice for riders who want elite e-moto performance without the legal profile of an electric dirt bike.
The AIMA Big Sur is a class 3 fat tire e-bike designed for road and light off-road use. It features a 750W motor, 26" x 4" puncture-resistant fat tires, and a 48V 15Ah (720Wh) LG battery with UL-rated safety. The e-bike includes a Bafang TFT LCD display, Tektro hydraulic brakes, Shimano 8-speed drivetrain, torque sensor, and comfort features like an oversized seat and ergonomic grips. Accessories include plastic fenders, an MIK HD rear rack, and a quick-release motor cable. The model is sold direct-to-consumer and balances comfort, performance, and safety.
