The Roll Road Emma 4.0 is a heavy-duty, moped-style ebike designed for high performance and long-range utility. Here is a summary of its technical specifications:
Performance & Power
- Motor: 1500W Bafang Sutto rear hub motor (1800W peak) with 110 Nm of torque.
- Top Speed: 35+ mph (unlocked); 25 mph (standard street mode).
- Range: Up to 150 miles (estimated with dual batteries and pedal assist).
- Pedal Assist: 5 levels, powered by a center-axle torque sensor.
- Throttle: Half-twist throttle.
Battery & Charging
- Battery System: Dual 52V 20Ah EVE lithium-ion batteries (Total 40Ah / 2080Wh).
- Design: One battery is integrated into the frame; the second is mounted on the rear.
- Charger: 52V 3A fast charger.
Chassis & Components
- Frame: 10mm-thick 6066 aluminum alloy reinforced frame.
- Front Suspension: Double-crown motorcycle-level hydraulic fork (adjustable with lockout).
- Rear Suspension: Dual 330mm adjustable nitrogen air shocks.
- Brakes: 4-piston hydraulic disc brakes with 180mm rotors.
- Tires: 20″ x 4.0″ CST Scout puncture-resistant fat tires.
- Drivetrain: Single-speed Shimano with a Dacromet anti-rust chain.
Design & Capacity
- Payload Capacity: 450 lbs.
- Weight: Approximately 116 lbs with both batteries installed.
- Saddle: 18″ ergonomic cushioned seat (standard) or 24″ extended seat (optional).
- Seat Height: Adjustable options for 33″, 34″, or 35″.
Electronics & Lighting
- Display: 4-inch color smart LCD with NFC unlocking and a 1A USB charging port.
- Lighting: 2000-lumen LED headlight, integrated brake light, and front/rear turn signals.
- Features: Cruise control and heavy-duty front/rear fenders included.
For a guy who doesn’t usually ride e-mopeds because I’m tall I really dig riding the Emma. I think its going to be a great delivery ebike or for running errands. It has good power, dual batteries and dual suspension.
Getting the rear box on was a pain but other than that I have no complaints about the Emma 4.0 Get yours here.