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The Emma 4.0 is a moped-style fat-tire ebike with a 1500W Bafang Sutto rear hub motor and two 52V 20Ah EVE batteries (2080Wh total). It claims up to 150 miles of range under ideal conditions and a 450 lb payload on a 10mm 6066 aluminum frame. Riders praise the stable, comfortable ride, strong hill climbing and easy assembly. The main concerns are weight, a controller that runs hot and can cut pedal assist, and one long-term report of motor and connector failures.
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Riders rate it highly, praising comfort, stability and build quality on long rides and hills. Complaints center on weight and, in one long-term case, motor and controller reliability.
| Code | Measurement | Value |
|---|---|---|
| A | Handlebar Height | 43.8" |
| B | Total Length | 68.5" |
| C | Wheelbase | 45.7" |
| D | Seat Height (18") | 35" |
| D | Seat Height (24") | 34" |
| - | Lower Seat Height | 33" |
| E | Chainstay Length | 25.2" |
| F | Wheel Diameter | 22.4" |
| G | Seat Length | 18" |
| H | Rack Length | 8.7" |
| I | Head Tube Length | 6.3" |
| J | Handlebar Length | 28.6" |
The Emma 4.0 is a moped-style fat tire e-bike with a 1500W Bafang Sutto rear hub motor and 110 Nm of torque. Top speed is 25 mph in standard street mode and 35+ mph when unlocked. A center axle torque sensor and a speed sensor control the pedal assist.
Two 52V 20Ah EVE lithium-ion batteries give a total of 40Ah (2080Wh). Range is up to 150 miles under ideal conditions. The frame is reinforced 6066 aluminum alloy, 10mm thick, and supports a payload of 450 lbs.
The front fork is a dual-crown hydraulic fork with lockout, and the rear has adjustable nitrogen air shocks. Hydraulic disc brakes handle stopping. It rolls on 20" x 4.0" CST Scout puncture-resistant fat tires. The seat height is 35 in (89 cm), and the bike suits riders 5'4" and above.
