IN STOCK
UNLOCKED 28MPH (45KMH) CLASS 3
(CLASS 3 READY)
ADDITIONAL SUNNY DAY - 12AH ACCESSORIES
FIND OUT WHAT SIZE FITS YOU
A rider's height is best determined for size with 48V 12AH (17.5" frame) optimal for people 5'2" to 5'7" and 48V 20AH (19.5" Frame) ideal for those 5'8" to 6'6".
SIZE GUIDE
| SIZE | FRAME | RIDER'S HEIGHT |
|---|---|---|
| S/M | 17.5" | 5'2" TO 5'7" |
| M/L | 19.5" | 5'8" TO 6'6" |
Weight capacity for both sizes is 285lbs (130kg)
WARRANTY POLICY:
All of our e-bike models come with a three-year frame warranty plus a one-year or 800km (whichever comes first) replacement warranty on major parts. If a part is defective in manufacturing process we will replace it free of charge. All parts can be easily ordered on our website.
RETURN POLICY:
We are so confident in the quality of our e-bikes and know that you will love them. As such, we are proud to offer a 7-day no questions asked money back guarantee on all of our models.
* Only applies to customers who buy their bike directly from the Surface 604 website
IN STOCK
CHOOSE A BATTERY
ADDITIONAL ACCESSORIES
CHOOSE A COLOR
CHOOSE A FRAME SIZE
FIND OUT WHAT SIZE FITS YOU
A rider's height is best determined for size with 48V 12AH (17.5" frame) optimal for people 5'2" to 5'7" and 48V 20AH (19.5" Frame) ideal for those 5'8" to 6'6".
SIZE GUIDE
| SIZE | FRAME | RIDER'S HEIGHT |
|---|---|---|
| S/M | 17.5" | 5'2" TO 5'7" |
| M/L | 19.5" | 5'8" TO 6'6" |
Weight capacity for both sizes is 285lbs (130kg)
WARRANTY POLICY:
All of our e-bike models come with a three-year frame warranty plus a one-year or 800km (whichever comes first) replacement warranty on major parts. If a part is defective in manufacturing process we will replace it free of charge. All parts can be easily ordered on our website.
RETURN POLICY:
We are so confident in the quality of our e-bikes and know that you will love them. As such, we are proud to offer a 7-day no questions asked money back guarantee on all of our models.
* Only applies to customers who buy their bike directly from the Surface 604 website
Reviews
2024 UPDATES
TORQUE SENSING PEDAL ASSIST
World class torque sensing pedal assist - because an electric bike is only as good as it’s power distribution.
Precision torque sensing performance at 104 cadence pulses per revolution; 1,000 torque samples per second.
Sunny Day’s incredibly smooth torque sensor knows how hard you’re pedaling down to the microsecond and matches it with proportionate power.
Custom drop out design delivers whisper smooth assist at any level.
POWERFUL 500W MOTOR
BAFANG 48V 500W electric motor purpose built for speed and power. Enjoy the quiet and consistent power distribution at any speed.
Geared for performance - we paired all that power with an industry-leading 12mosfet 25A controller giving the Sunny Day unmatched torque and speed.
Leave other riders envious as you effortless fly past
LONG RANGE BATTERY
Offering a high-capacity battery option: 48V20ah (960wh) 5000mah cell size, (Same as in Tesla), Samsung Cells 21700. Made in Korea, USB Plug, capacity indicator button.
Range up to 65 Miles (105 Kms)
Weight: 10.23 LBS (4.65 KG)
POWERFUL 500W MOTOR
BAFANG 48V 500W electric motor purpose built for speed and power. Enjoy the quiet and consistent power distribution at any speed.
Geared for performance - we paired all that power with an industry-leading 12mosfet 25A controller giving the Sunny Day unmatched torque and speed.
Leave other riders envious as you effortless fly past
KEY
TECH SPECS
WITH MOTOR INHIBITORS AND 180MM ROTORS
MOTOR
DRIVE MODE
TORQUE
THROTTLE
CONTROLLER
TOP SPEED
BATTERY
BATTERY RANGE
BATTERY CHARGE TIME
DISPLAY TYPE
LIGHTS
FORK
MOTOR WIRE HARNESS
DERAILLEUR
CASSETTE
SHIFT LEVERS
BRAKES
CRANK SET
ROTORS
BOTTOM BRACKET
FRAME TYPE
FRAME MATERIAL
STEM
HEAD SET
HANDLEBAR
PEDALS
CHAIN
SEAT POST DIAMETER
SADDLE
WHEELS/TIRE
RIMS
FRONT HUBS
KICKSTAND
STANDOVER HEIGHT
RECOMMENDED RIDER HEIGHT
NET WEIGHT (INCLUDING BATTERY)
BATTERY WEIGHT
WEIGHT CAPACITY
STANDARD FEATURES
OPTIONAL UPGRADE FEATURES
| M/L | ||
|---|---|---|
| TTH. | Top Tube Length (mm) | |
| HTA. | Head Tube Angle (deg) | |
| HTL. | Head Tube Length (mm) | |
| STA. | Seat Tube Angle (deg) | |
| STL. | Seat Tube Length (mm) | |
| CSL. | Chainstay Length (mm) | |
| WB. | Wheelbase (mm) |
KEY
TECH SPECS
WITH MOTOR INHIBITORS AND 180MM ROTORS
VIEW ALL TECH SPECS
MOTOR
DRIVE MODE
TORQUE
THROTTLE
CONTROLLER
TOP SPEED
BATTERY
BATTERY RANGE
BATTERY CHARGE TIME
DISPLAY TYPE
LIGHTS
FORK
MOTOR WIRE HARNESS
DERAILLEUR
CASSETTE
SHIFT LEVERS
BRAKES
CRANK SET
ROTORS
BOTTOM BRACKET
FRAME TYPE
FRAME MATERIAL
STEM
HEAD SET
HANDLEBAR
PEDALS
CHAIN
SEAT POST DIAMETER
SADDLE
WHEELS/TIRE
RIMS
FRONT HUBS
KICKSTAND
STANDOVER HEIGHT
RECOMMENDED RIDER HEIGHT
NET WEIGHT (INCLUDING BATTERY)
BATTERY WEIGHT
WEIGHT CAPACITY
STANDARD FEATURES
OPTIONAL UPGRADE FEATURES
| M/L | ||
|---|---|---|
| TTH. | Top Tube Length (mm) | |
| HTA. | Head Tube Angle (deg) | |
| HTL. | Head Tube Length (mm) | |
| STA. | Seat Tube Angle (deg) | |
| STL. | Seat Tube Length (mm) | |
| CSL. | Chainstay Length (mm) | |
| WB. | Wheelbase (mm) |
