Juggernaut Ultra Duo 4 SO

Sale price $2,999 USD Regular price$3,499 USD
Save $500 USD
Sale ends in
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🚀 Limited time only: Get a FREE Range Extender Battery.

Act Now! Sale ends Sept 02.

Black
Packages
Battery
Range Extender Battery
 

Add an additional battery to extend your bikes range and give you that boost!

Upgrades
Motor Power
 

Program your motor to meet local eBike regulations or opt for unlimited speed and power suitable for off-road use only.

Seatpost
 

Suspension seatposts offer great riding comfort as they absorb many of the imperfections on the road/trail.

***Adding a suspension seatpost to your eBike will increase the minimum seatpost height by 75mm/3" to 150mm/6"
Fork
 

Elevate your ride's comfort and control by upgrading your ebike fork, ensuring a smoother journey over any terrain.

**The Upgraded Fork options are incompatible with the front fender included with the bike.
Drive Train
 

Unmatched power, smooth performance, and eco-friendly commuting in one seamless package.

**Drivetrain upgrade included Shifter, Cassette, Derailleur and Chain
Brakes
 

Enhance your safety and control on every ride by upgrading your eBike brakes.

***Tektro and Magura upgrades come with a brake rotor upgrade from 160mm to 203mm
Headlights
 

Illuminate your path to adventure with an upgraded eBike headlight, delivering superior visibility and style for night-time riding.

Note: This is a DIY upgrade upon purchasing the bike. Our Installation Guide for this can be found here.

Rear Hub
 

Upgrade your eBike's rear hub for a smoother, more efficient ride, unlocking enhanced performance and reliability with every pedal.

Biktrix A-Bars
 

The swept-back design provides an upright riding position with multiple comfortable hand positions so you can enjoy further and more frequent rides!

Accessories
Warranty

Secure your investment by opting for an extended warranty through the BiktrixCare+ plan.

Sale price $2,999.00 Regular price$3,499.00
Shipping: Leaves within 6-7 business days
1000W Mid-Drive

Motor Power

Up to 90mi

Standard Range

+5'6"ft / 380lb

Max Load

Torque Sensor

Powerful Pedal Assist

On-Demand Throttle

Pedaling Optional

UL Certified

Safety

90+

Miles Range

160Nm

Torque For Extreme Hills

52V 17Ah

Strong, Reliable Battery

The Duo Series. Ebikes For Everyone.

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.

Watch this video to see how The 3 Duo models stack up.

Welcome To The Big Leagues.

The Ultra Duo sits at the top of the Duo range, so naturally, it boasts one of the most powerful motor systems available today. The Bafang Ultra M620 mid-drive motor is loaded with 1500W of peak power and 160Nm of torque. Pair that with the 11-speed drivetrain and you'll be nearly unstoppable.

Ultra Power. Greater Features.

Distance Range (Single Battery)

PAS 1
Pedal-Assist Lv.1
52mi
PAS 2
Pedal-Assist Lv.2
43mi
PAS 3
Pedal-Assist Lv.3
38mi
PAS 4
Pedal-Assist Lv.4
35mi
PAS 5
Pedal-Assist Lv.5
31mi
THRL
Throttle Only
22mi
**Please note that information regarding the expected range on a single stock battery charge on one of our e-bikes is an estimate, not a guarantee. There are many factors that contribute to the actual, real-world range for an e-bike battery such as the age of the battery, temperature, level of assist, speed, payload, and terrain. Depending on these various conditions, it is possible to get less than the expected minimum range or greater than the expected maximum range.

Technical Specifications

Frame
6061 aluminum
Front hub
135m 36h
Seat post
28.6mm
Fork
Rst guide w/75mm travel, lockout & preload
Front axle
5mm qr
Seat post clamp
Qr
Headset
Threadless 1-1/2" 1-1/8" tapered
Rear hub
190mm 36h
Motor
Bafang ultra m620
Shifter rear
Shimano alivio 9 speed trigger
Rear axle
5mm qr
Battery sizes
Total capacity of 52v 34ah 1794wh:
52v 17.5ah 910wh (internal battery) +
up to 52v 17ah 884wh (external range extender battery)
Rear derailleur
Shimano alivio 9 speed
Rims
26" black w/ round cutouts, 27.5" solid black
Display
Dpc-18 colour display
Cassette
11-34t
Tire sizes
26x4 chaoyang, 27.5x3 chaoyang
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, 170mm crank arms
Stem
Adjustable stem w/31.8mm clamp
Assist levels
1-5
Bottom bracket
Bafang isis
Grips
Slide-on comfort grips
Throttle
Thumb throttle
Brakes
Biktrix dual piston hydraulic w/ integrated brake cutoffs
Saddle
Wide spring supported comfort saddle
Other
Rack, fenders, kickstand
Brake levers
Biktrix adjustable w/ integrated brake cutoffs
Frame
6061 aluminum
Front hub
135m 36h
Seat post
28.6mm
Fork
Rst guide w/75mm travel, lockout & preload
Front axle
5mm qr
Seat post clamp
Qr
Headset
Threadless 1-1/2" 1-1/8" tapered
Rear hub
190mm 36h
Motor
Bafang ultra m620
Shifter rear
Shimano alivio 9 speed trigger
Rear axle
5mm qr
Battery sizes
Total capacity of 52v 34ah 1794wh:
52v 17.5ah 910wh (internal battery) +
up to 52v 17ah 884wh (external range extender battery)
Rear derailleur
Shimano alivio 9 speed
Rims
26" black w/ round cutouts, 27.5" solid black
Display
Dpc-18 colour display
Cassette
11-34t
Tire sizes
26x4 chaoyang, 27.5x3 chaoyang
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, 170mm crank arms
Stem
Adjustable stem w/31.8mm clamp
Assist levels
1-5
Bottom bracket
Bafang isis
Grips
Slide-on comfort grips
Throttle
Thumb throttle
Brakes
Biktrix dual piston hydraulic w/ integrated brake cutoffs
Saddle
Wide spring supported comfort saddle
Other
Rack, fenders, kickstand
Brake levers
Biktrix adjustable w/ integrated brake cutoffs
Frame
6061 aluminum
Front hub
135m 36h
Seat post
28.6mm
Fork
Rst guide w/75mm travel, lockout & preload
Front axle
5mm qr
Seat post clamp
Qr
Headset
Threadless 1-1/2" 1-1/8" tapered
Rear hub
190mm 36h
Motor
Bafang ultra m620
Shifter rear
Shimano alivio 9 speed trigger
Rear axle
5mm qr
Battery sizes
Total capacity of 52v 34ah 1794wh:
52v 17.5ah 910wh (internal battery) +
up to 52v 17ah 884wh (external range extender battery)
Rear derailleur
Shimano alivio 9 speed
Rims
26" black w/ round cutouts, 27.5" solid black
Display
Dpc-18 colour display
Cassette
11-34t
Tire sizes
26x4 chaoyang, 27.5x3 chaoyang
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, 170mm crank arms
Stem
Adjustable stem w/31.8mm clamp
Assist levels
1-5
Bottom bracket
Bafang isis
Grips
Slide-on comfort grips
Throttle
Thumb throttle
Brakes
Biktrix dual piston hydraulic w/ integrated brake cutoffs
Saddle
Wide spring supported comfort saddle
Other
Rack, fenders, kickstand
Brake levers
Biktrix adjustable w/ integrated brake cutoffs

Size & Fittings

1
Effective Top Tube Length
590mm 23.2in
2
Seat Tube Length (Classic Bike Size)
470mm 18.5in
3
Reach
440mm 17.3in
4
Stack
660mm 26in
5
Chainstay Length
510mm 20.1in
6
Standover Height
730mm 28.7in
7
Head Angle
70° -
8
Seat Angle
73° -
9
Head Tube Length
180 mm 7.1 in
10
Fork Length
540mm 21.3in
11
Front Center
730mm 28.7in
12
BB (Bottom Bracket) Drop
60mm 2.4in
13
Fork Offset
40mm 1.6in
14
Wheelbase
1230mm 48.4in
15
Total Length
2000mm 78.7in
16
Max Seat Height
1050mm 41.3in
17
Min Seat Height
880mm 34.6in
18
Handlebar Height
1140mm 44.9in
19
Weight (Without Battery)
34kg 75lb
1
Effective Top Tube Length
590mm 23.2in
2
Seat Tube Length (Classic Bike Size)
420mm 16.5in
3
Reach
440mm 17.3in
4
Stack
660mm 26in
5
Chainstay Length
500mm 19.7in
6
Standover Height
690mm 27.2in
7
Head Angle
70° -
8
Seat Angle
73° -
9
Head Tube Length
0 mm 0 in
10
Fork Length
540mm 21.3in
11
Front Center
720mm 28.3in
12
BB (Bottom Bracket) Drop
60mm 2.4in
13
Fork Offset
40mm 1.6in
14
Wheelbase
1230mm 48.4in
15
Total Length
2000mm 78.7in
16
Max Seat Height
1000mm 39.4in
17
Min Seat Height
830mm 32.7in
18
Handlebar Height
1120mm 44.1in
19
Weight (Without Battery)
34kg 75lb

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Customer Reviews

Based on 123 reviews
72%
(89)
11%
(13)
10%
(12)
2%
(2)
6%
(7)
S
Scott Hendry
Impressed with pre-sales customer support

I have been researching e-bikes for 2 years. I made my decision to go with Biktrix and ended up with the Juggernaut Ultra Duo 4 SO. I had many conversations with team members at Biktrix and I am very appreciative they helped me identify the right bike since I was not able to try it before buying it. They also recommended the right size and fit and some excellent options and configured the bike before shipping it with the additional options. I was also impressed with the range of videos and online support they offer. There are cheaper options online but for something as specialized as an E-Bike, I was eager to find a vendor that could prove they would provide adequate support by phone/email etc. I see this as exceptional value. Assembling it was easy and it was fully operational shortly after I received the shipment. I am very pleased with this purchase and would highly recommend Biktrix to anyone wanting to buy an E-Bike online.

L
Latin Louie
Great Bike, well made and have had it for one week now!

I am really enjoying riding my new Juggernaut Ultra Duo 2 Step-Over. It has been 5 years since I have had ridden a bike. My old English 10 speed with the skinny tires got ruined in a flood and I never replaced it until now. I carefully investigated many of the available E-Bikes and listened carefully to many of the reviews on Biktrix Bikes. I made a decision to buy one and very happy that I did. Power assist is a different feel, and I am taking is slowly as recommended. The Biktix staff has been most helpful and you can't ask for more than that. I highly recommend getting your E-Bike from this company.

C
Customer
Juggernaut ultra 2

Only had the bike out a couple of times. The weather has not been great here in April. Loving the bike so far. Time will tell. climbing hills and Head winds are a thing of the past. Looking forward to Summer.

G
Graydon Gardner
Ride on

Got my bike less than 10 days after ordering and had all my questions answered along the way. Bike showed up as ordered and operated great right out of the box. I opted for the 11 speed and Wren hub. I’m looking forward to riding into work this summer. Overall, this bike is a blast to drive and is very well put together. Cheers !

l
leonard Cervo
Ultra duo 3

Received e-bike, very easy to finish set up of bike. Already been on two rides

D
DAVID MC GAVOCK
Ultra Duo is a great fit for me

I spent hours on the Biktrix website comparing the various models and alternative features of the models. I decided the Ultra Duo was the most affordable and best fit for me. Since it arrived I have ridden it on gravel and pavement and dirt pathways. It handles well in all environments. I really enjoy the ride. While I still have much to learn about the features I know that I will get many happy miles out of this beauty. Also glad that I sprung for the Biktrix A-bar and the comfort grips.

T
Thaddeus Knight
Test ride only still at the bike shop.

The bike engineer says there's a defect and the Front fort and it has to be replaced making a loud noise. Waiting Your service department to reply to my bike mechanic. Not happy

C
Christophe lehmann
Juggernaut! Without discussion.

I love it. This is my second E-Bike. First one is ok with few flaws. The Juggernaut with cassette and brakes upgrades is just perfect for me. I'm 6-2, 260 pounds and carry a lot of luggages with no effect on the performances. Riding my biktrix daily remains a pure pleasure.

T
T.J. Mitchell
What a dream to ride, it takes me back to when I thought I could go anywhere!

I really like my new Ultra Duo step-over. I am learning all about it. We need a dealer in Calgary. I believe the drive train needs some tuning as sometimes it shifts on it’s own.