Built for Every Body.
"Powerful Support, Smooth Ride"
Free shipping
30-Day Return
2-Year Warranty
Details
Details
- Shipped as class2
- 2 Person Seat Version Including 2 Seats: Standard Seat & 2-person Seat
- In Stock-Free shipping from CA Warehouse within 8hrs
- Pick Up Service: 6610 DOOLITTLE AVE, RIVERSIDE, CA 92503
Emma 3.0 vs Emma 4.0 – Key Upgrades
Emma 3.0 vs Emma 4.0 – Key Upgrades
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
TECHNICAL SPECIFICATIONS
TECHNICAL SPECIFICATIONS
Why is the Roll-road Emma 4.0 the most powerful electric bike in the USA?
Motor: 52V 1500W BAFANG rear hub brushless motor
Battery: 52V 20Ah×2 EVE lithium-ion battery
Charging Time: 6–8 hours
Range: Up to 150 miles on a full charge
Top Speed: 28 mph (public road compliant), 35 mph (unlocked for private use)
Frame: Reinforced 10mm-thick 6066 aluminum alloy
Tires: CST Scout Puncture-Resistant Tire
Brakes: 180mm four-piston hydraulic disc brakes
Suspension: Front dual hydraulic suspension + Rear genuine nitrogen shock absorber
Display: Waterproof and dustproof color LCD with built-in USB phone charging
Weight: 110 lb/84 lb (w/o battery)
SHIPPING & RETURNS
SHIPPING & RETURNS
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 atmailto:support@roll-road.com.Please retain all original packaging and materials for potential returns.
FULL REMOTE SUPPORT INCLUDED
- TALK TO A HUMAN -INSTANTLY.
- STEP-BY-STEP VIDEO GUIDES.
- NO BOTS. JUST EXPERTS.
35 mph top
150-mile range
450-lb capacity
Up to slope 15°
Stable. Silent. Always in Control.
Stable. Silent. Always in Control.
Built for Real Urban Life
The smooth, stable e-bike that rides all day, carries two, and lights your way—so you move through the city on your terms.
Your City. Your Pace.
All-day riding
Built for Two
See Clearly, Ride Confidently
Integrated. Stable. Silent.
Emma 4.0 upgrades the side-mounted battery of Emma 3.0 to a sleek, fully embedded design. Integrated into the frame, the new battery bay eliminates vibrations and rattling—even on rough roads—for a smoother, quieter ride. It also lowers the center of gravity, improving stability, handling, and balance, while giving the bike a cleaner look.
No Limits.Just Power.
52V advanced system: higher efficiency, steadier power (vs. 48V). 1500W BAFANG SUTTO motor: strong, snappy acceleration—ideal for cargo & steep climbs
Dual Battery
Equipped with a dual EVE battery system featuring two 52V 20Ah units, it delivers a combined capacity of 40Ah (2080Wh of total energy) and an impressive range of up to 150 miles.
The Unbeatable Frame
Designed specifically for riders weighing over 450 lbs Constructed from the industry's thickest 10mm aerospace-grade aluminum for unbreakable durability.
Dual-Air ProSuspension
Double crown motorcycle level hydraulic FRONT fork; The only and best Nitrogen REAR Air Shocks on the market; Both front and rear are adjustable.
Torque Sensor
Pedal harder, power surges—effortless climb, natural ride.
Ride Comfort System
Front & rear suspension + ergonomic seat = smooth ride on any road
Everyday Essentials
Thoughtfully equipped for your everyday ride.
Smart Display
4" color LED display—packed with all the details you need. NFC unlock for total freedom!
For Safety
Designed to see and be seen.
Largest Cargo Capacity
Turn your EMMA4.0 into a multi-purpose e-bike—pair the rear rack with our Passenger Seat and Cargo Trunk for max capacity.
Cruise Control
Set. Relax. Ride. The simplest way to cruise. Hold your speed without holding the throttle.
Size And Fit
AHandlebar Height 43.8"
BTotal Length 68.5"
CWheelbase 45.7"
D18" Seat Height: 35''
24" Seat Height: 34''
Lower Seat Height: 33''
EChainstay Length 25.2"
FWheel Diameter 22.4"
GSeat Length 18"
HRack Length 8.7"
IHead Tube Length 6.3"
JHandlebar length 28.6"
EMMA 4.0: The Upgraded Successor to EMMA 3.0
While official benchmarks for EMMA 4.0 are pending, existing EMMA 3.0 evaluations serve as a reliable baseline—improved performance across the board.
Mike， 6‘2“ 400lb（188cm 181kg）
John, 6'4" 350lb（193cm 159kg）
Tim, 6' 280lb（183cm 127kg）
Bryan, 6' 180lb（183cm 82kg）
Richard， 6’2" 300lb（188cm 136kg）