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Juggernaut Ultra Duo 4 Step-Thru

Sale price CA$3,799.00 Regular priceCA$6,299.00

Biktrix Holiday Sale!  No Code needed. $2500 off MSRP. Limited stock 🚨

Delivers the sweet spot for capability and comfort with a mid-drive motor

Emerald Green
Range Extender Battery

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

**This option adds an extra battery that mounts on top of the frame that doubles the range of the stock battery.
Motor Power

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


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 100mm/4" to 150mm/6"

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

**The price is discounted from the regular price of $300

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

**The Wren Inverted Suspension Fork upgrade is incompatible with the front fender included with the bike.

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
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!


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

Shipping: Leaves within Out Of Stock
Sale price CA$3,799.00 Regular priceCA$6,299.00
Lifetime support
14 Days Return
Custom Built

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 9-speed drivetrain and you'll be nearly unstoppable.

Ultra Power. Greater Features.

Mid-Drive Motor

The Bafang Ultra M620 mid-drive motor features 1000 watts of power and 160Nm of torque. Span cities, climb hills and explore all the places you want to go with ease.

LCD Display

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

Thumb Throttle & Control Pad

With just a push of a thumb, you can access all of the power the motor has to offer.

Suspension Fork

The RST Guide spring suspension fork provides 75mm of travel with pre-load and lockout adjustability.


From climbing hills top holding maximum speed on flats, the Shimano Alivio 9 Speed drivetrain has you covered.

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.

Integrated Front Light

This bright LED light is powered by the bike’s battery and can be turned on and off with a button on the handlebar control pad.

Optional Range Extender Battery

Multiple range-extender battery options can expand your eBike’s range all the way to 160 kilometres.

Rack & Fenders

These fenders will keep you and your bike clean. Need to carry some gear? Strap it onto the rear rack and head out!

Technical Specifications

Size & Fittings

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
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

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Customer Reviews

Based on 109 reviews
James Wolford
Juggernaut Ultra Duo 4 Step-Thru?

Lots of power. Easy to assemble . So far I haven't put many K on the bike.

Richard Meissner
Love the bike👍😊

Riding the bike with the mid drive is great. I was use to have a hub drive. I can tell I’m going to love this bike.

Keith Gagnier
Great potential, but only as good as it’s weakest feature.

I have owned 3 -bikes and I was extremely excited to buy a bike that has all the features I want. Unfortunately, their responses to questions and website information are not in alignment with non-working features that come to the surface with a little riding time (145 miles).
1. I got stranded, having to walk several hills over a 5 mile stretch to return home. Amongst listed features is a battery gage (% charge and remaining miles estimate/range). It dropped from 50% to 7% in 3 miles that was mostly downhill. They confirm these readings are “not applicable for accurate tracking and to use voltage reading of 44V” to trigger battery recharge, but it shuts down at 45.4 V. Their response to a fix is, “modifications cannot be made.” My other e-bikes had working battery gages, like those of my biking friends.
2. With seat at maximum height, handlebars are too low to meet recommended level.
3. They said the throttle functions with PA0, which is not the case, but they offered to fix that after pressuring them to deliver what was offered.
4. For safety on public roads, I want the taillight on, but when I do that, the display dims to the point that it cannot be read on a sunny day with sunglasses on.
5. $1037 US$ is the minimum cost to return my bike, so it makes no sense to return. I must live with the flaws.
6. Customer support totally misunderstood my straightforward questions on 3 occasions, putting me through hours of effort for nothing. I am a bit hopeful that there is a misunderstanding regarding resolution for the battery gage. I appears that I am on my own to come up with more comfortable handlebar height. I will try installing type A handlebars to reduce wrist pain I have experienced.
7. Some other relatively minor issues are: motor is noisy compared to a previous 750 watt center drive motor, shifting while going up hill is troublesome. The motors stops between shifts, causing slowdown or stops on steep hills. It shifts more smoothly at full throttle.
On the positive side, the riding experience and workmanship are excellent. It has gobs of power and sails over the steepest hills if desired. I use it with PA0 or PA1 for nearly all my hilly travels. I love the ability to choose any color. Support is quick to respond, but misunderstandings take time to resolve.
My test drive for standard battery capacity gave me 42.1 miles, over 4904 vertical feet total climb at 10.1 average MPH round trip. That is better than my previous e-bikes including one with a 20 ah battery.

I want to give at least 4 stars, but the weakest features are like an anchor that drags the whole experience down.

George Felegy
A lot of ebike

The bike is heavy and fast. It runs and rides like a small electric motorcycle which for me ( a motorcyclist for many years), it is perfect. For a novice ebike rider it may be too much bike to handle. Going from a lightweight regular bike to this might be overwhelming. The weight, wide 3” tires, and raw power is a handful, but an absolute blast if handled properly. I love it.

Roger Long

If you are planning on keeping your bike longer than a year, consider buying a new battery and Bixtrix want nothing to do with their battery’s unless you want to buy another one for $750 +.
Makes one wonder if Bixtrix doesn’t trust their batteries themselves.

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