Biktrix Juggernaut Ultra Duo 4 1000W 52V17Ah Step-Through Fat Tire Mid Drive Electric Bicycle with 5 Levels of Pedal Assist and Thumb Throttle


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The Juggernaut Duo Series is all about flexibility. Hub-drive or mid-drive, step-over or step-thru, single battery or dual battery, entry-level or high-end. No matter your needs, there's probably a Duo for you.
Features of the Biktrix Juggernaut Ultra Duo 4 1000W 52V Step-Through Fat Tire Mid-Drive eBike
- Powerful 1000W Bafang mid-drive motor
- Mid-drive motor - The mid-drive motor will let you roam cities, climb hills, and explore with ease
- Max torque - Get all the power you can handle, together with exceptional build quality and 160Nm of torque
- Up to 45 miles range on a single charge, depending on the rider's weight and riding conditions.
- Dual integrated battery system
-
5 Levels of Pedal Assist (PAS) to find just the right amount of help from the motor
- Sturdy step-through frame for easy on and off
- Cadence+Torque sensor makes Pedal Assist smooth and powerful
- Fat Tires - Whether you're up against sand, mud or snow, these tires will handle it without breaking a sweat. The Juggernaut Ultra Duo 4 is ready for all-season, all-terrain riding
- Big and easy to read LCD display
- Shimano 9-speed (gears) transmission
- Integrated front light - Never ride blind again. Our bikes come with front lights integrated with the main battery of the bike
- Fenders and rear rack included for FREE
- Up to 330 lbs. load capacity (depends on the fork you choose)
Step-Through frame
Many people associate the step-through bicycle as being for women, however, they are convenient for any gender. The big advantage of step-through bikes is that they make it easier and much more comfortable to mount the bike. Your feet will be able to touch the ground and there are no worries about losing your balance and possibly falling while trying to get on it.
Mid-drive Motor
The mid-motor makes the Juggernaut Ultra Duo 4 Step-Through very versatile. Mid-drive motors are much more efficient than hub drives as they can use the bike's gears as transmission. Hills become something of a novelty with the new Biktrix Juggernaut Ultra Duo 4 1000W 52V Step-Through Fat Tire Mid-Drive electric bicycle.

Thumb-throttle & control pad
Just a push of the thumb and this becomes a motorbike. The control pad allows you to turn the bike on/off and customize your riding experience. Just sit back and enjoy the ride.


LCD display
The LCD display shows you all kinds of important information about your ride including speed, battery life, range, odometer, pedal assist level, and more.

Hydraulic disc brakes
When it's so easy to go fast you need strong stopping power. These hydraulic disc brakes will quickly and reliably bring you to a halt.

RST guide suspension fork
The RST Guide Suspension fork provides control, traction, and comfort, making for an even, smooth ride every time. It is just one of the many Juggernaut Ultra Duo 4 Step-Through Fat Tire Mid-Drive features that add to the enjoyment of your eBike ride.

Integrated headlight
A bright LED will light your way when the sun goes down. It's powered by the bike's battery and can be turned on/off with a button on the handlebar control pad.

Rack and fenders
These fenders will keep you and your bike clean. Need to carry some gear? Strap on the rear rack and make your way.

The Biktrix Juggernaut Ultra Duo 4 Step-Through Fat Tire Mid-Drive eBike is perfect for commuting on the street or ripping up hills off-road. Simply put, it’s a ton of fun.

Personalize your Biktrix eBike and build a bike that is just perfect for you. Increase your bike’s functionality and boost your experience.

Three ways to ride the Biktrix Juggernaut Ultra Duo 4 1000W 52V Step-Through Fat Tire Mid Drive eBike
- Pedal only (with no help from the motor)
- Pedal Assist (with 5 levels of assist to choose from)
- Throttle only (effortless like a motorcycle)
The Biktrix Juggernaut Ultra Duo 4 Step-Through Fat Tire Mid-Drive eBike can be used as a normal bike where the rider provides all the power, or you can use just the throttle and let the bike do all of the work. There is also an in-between option, Pedal Assist, where the rider pedals and the motor provides a great boost at the same time. You can choose the level that is right for your type of riding. The Levels of Pedal Assist allow for increased ride efficiency, resulting in less strain on your knees while riding. It makes riding fun and effortless.
Specifications of the Biktrix Juggernaut Ultra Duo 4 1000W 52V Step-Through Fat Tire Mid-Drive eBike
FRAME |
6061 Aluminum
|
REAR HUB | 190mm 36H |
SEAT POST | 28.6mm |
FORK |
RST Guide W/80mm Travel, Lockout & Preload
|
REAR AXLE/SKEWER | 5mm QR |
SEAT POST CLAMP | QR |
HEADSET |
Threadless 1-1/2" 1-1/8" Tapered
|
RIMS |
26" Black With Round Cutouts / 27.5" Black Solid
|
MOTOR |
Bafang Ultra M620
|
SHIFTER REAR |
Shimano Alivio 9 Speed Trigger
|
TIRES | 26x4", 27.5x3" |
BATTERY SIZES |
Total Capacity Of 52V 36.5Ah 1898Wh: 52V 17.5Ah 910Wh (Internal Battery) + Up To 52V 19Ah 988Wh (External Range Extender Battery)
|
REAR DERAILLEUR |
Shimano Alivio 9 Speed
|
BRAKES |
Biktrix Dual Piston Hydraulic W/180mm Rotors
|
DISPLAY | DPC-18 |
CASSETTE | 11-34T |
BRAKE LEVERS |
Biktrix Adjustable W/ Integrated Brake Cutoffs
|
LIGHTS |
Integrated Headlight, Integrated Taillight
|
CHAIN |
KMC E9s 124 Links
|
HANDLEBAR |
700mm Wide, 50mm Rise W/31.8mm Clamp
|
ASSIST TYPE |
Torque + Cadence
|
CRANK SET |
44T Chainring W/ 170mm Arms
|
STEM |
Adjustable Stem
|
ASSIST LEVELS | 0-5 |
BOTTOM BRACKET | Bafang ISIS |
GRIPS |
Slide-On Comfort Grips
|
THROTTLE |
Thumb Throttle
|
FRONT HUB | 135mm 36H |
SADDLE |
Wide Spring Supported Comfort Saddle
|
OTHER |
Front And Rear Fenders, Kickstand, Rear Rack
|
FRONT AXLE/SKEWER | 5mm QR |

16"
1 | Effective Top Tube Length | 560mm | 22in |
2 | Seat Tube Length (Classic Bike Size) | 420mm | 16.5in |
3 | Reach | 520mm | 20.5in |
4 | Stack | 500mm | 19.7in |
5 | Chainstay Length | 480mm | 18.9in |
6 | Standover Height | 430mm | 16.9in |
7 | Head Angle | 68° | - |
8 | Seat Angle | 71° | - |
9 | Head Tube Length | 180 mm | 7.1 in |
10 | Fork Length | 530mm | 20.9in |
11 | Front Center | 710mm | 28in |
12 | BB (Bottom Bracket) Drop | 40mm | 1.6in |
13 | Fork Offset | 30mm | 1.2in |
14 | Wheelbase | 1240mm | 48.8in |
15 | Total Length | 2000mm | 78.7in |
16 | Max Seat Height | 1000mm | 39.4in |
17 | Min Seat Height | 830mm | 32.7in |
18 | Handlebar Height | 1100mm | 43.3in |
19 | Weight (Without Battery) | 33.5kg | 73.9lb |
18"
1 | Effective Top Tube Length | 560mm | 22in |
2 | Seat Tube Length (Classic Bike Size) | 460mm | 18.1in |
3 | Reach | 560mm | 22in |
4 | Stack | 520mm | 20.5in |
5 | Chainstay Length | 520mm | 20.5in |
6 | Standover Height | 450mm | 17.7in |
7 | Head Angle | 68° | - |
8 | Seat Angle | 71° | - |
9 | Head Tube Length | 180 mm | 7.1 in |
10 | Fork Length | 530mm | 20.9in |
11 | Front Center | 730mm | 28.7in |
12 | BB (Bottom Bracket) Drop | 50mm | 2in |
13 | Fork Offset | 30mm | 1.2in |
14 | Wheelbase | 1240mm | 48.8in |
15 | Total Length | 2000mm | 78.7in |
16 | Max Seat Height | 1000mm | 39.4in |
17 | Min Seat Height | 880mm | 34.6in |
18 | Handlebar Height | 1160mm | 45.7in |
19 | Weight (Without Battery) | 34kg | 75lb |
Download Old Juggernaut User Manual HERE (very useful for all Biktrix eBikes)
Videos of the Biktrix Juggernaut Ultra Duo 4 1000W 52V Step-Through Fat Tire Mid-Drive eBike
