Emma 4.0

• Class 2 E-Bike: Fully compliant with U.S. federal regulations (max 20 mph with pedal assist, throttle up to 20 mph)

• Dual-Rider Ready: Includes both the standard solo seat and a factory-installed 2-person passenger seat

• In Stock & Ready to Ship: Order by 2 PM PT and your bike ships the same day from our California warehouse

• Free Fast Shipping: Delivered anywhere in the contiguous U.S. at no cost

• Local Pickup Available: Visit our warehouse at 611 Reyes Dr, Walnut, CA 91789 – schedule your pickup during checkout

• Range: Up to 150 miles (with pedal assist)

• Top Speed: 35 mph (unlocked)

• Max Load Capacity: 450 lb (rider + cargo)

• Hill Climbing Ability: Up to 16.7° slope (30% grade)

• Suspension: Full dual hydraulic suspension with nitrogen-charged air shocks

• Pedal Assist (PAS): 5 levels (0–5)

• Bike Weight: 116 lb (with battery) / 90 lb (without battery)

• Drivetrain: 1-speed Shimano

• Motor: 1500W continuous (1800W peak), Bafang high-torque rear hub motor

• Throttle: Half-twist throttle for smooth, intuitive acceleration

• Battery: Dual 52V/20Ah lithium-ion packs (total 2.08 kWh)

• Charger: Fast 3A smart charger – full charge in approximately 7 hours

• Controller: 32A programmable controller with thermal and over-current protection

• Torque Sensor: Center-mounted for natural, responsive pedal assist (PAS Levels 0–5)

• Display: 4" full-color LCD smart display – shows speed, battery level, and ride data

• Lighting:

– Headlight: 2000-lumen LED

– Turn Signals: Integrated front & rear LED indicators

• USB Port: 1A output for charging phones, GPS, or navigation devices

• Front Fork: Double-crown hydraulic suspension with adjustable preload and lockout

• Rear Suspension: 0.4MPa motorcycle-grade air shocks with adjustable hydraulic damping

• Wheels: Lightweight aluminum alloy rims

• Tires: CST Scout 20" × 4.0" fat tires with reflective sidewall strip for night safety

• Brakes: 4-piston hydraulic disc brakes

• Brake Rotors: 180mm front and rear

• Chain: KMC Dacromet-coated anti-rust chain for long-lasting performance

• Pedals: Wellgo platform pedals – durable and grippy

• Saddle: Ergonomic cushioned saddle for all-day comfort

• Fenders: Full front and rear fenders included – keeps you clean in wet conditions

• Lighting:

– Headlight: 2000-lumen LED high-beam headlight

– Tail Light: Integrated LED brake light and turn signals

Headlight
• Emma 3.0: Standard color headlight
• Emma 4.0: Brighter, sleek, integrated

Front Battery Mount
• Emma 3.0: Side-mounted
• Emma 4.0: Integrated frame battery – stable, no vibration

Rear Battery Handle
• Emma 3.0: No handle
• Emma 4.0: Pull-handle for easy removal

Turn Signals
• Emma 3.0: Basic indicators
• Emma 4.0: Larger, brighter, more
stylish turn lights

Electrical System
• Emma 3.0: Standard wiring
• Emma 4.0: Optimized circuit & controller – smoother, more efficient power delivery

We offer free shipping on all of our bikes everywhere within the US lower 48 States.（Excludes: Alaska/Hawaii, US Protectorates, APO/FPO, PO Box）

Shipping Time
In-stock orders typically ship in the next business day, unless otherwise noted on the product page. 

We provide optional signature services. There are so many electric bikes thefts, customers are advised to choose this option. We purchase this service at no cost to you.

If your product arrives damaged, please email us :support@roll-road.com.Please retain all original packaging and materials for potential returns.