🛍️ Free Shipping On *All eBike Orders Shop Now
Find A Dealer

Juggernaut Ultra Duo 2 Step-Over

Sale price $2,949.00 Regular price$4,499.00
Save $1,550

🚨 Get a FREE Range Extender Battery (worth $499) by adding it to your cart and applying the code EXTRA at checkout. Offer for a limited time only.

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. Note: 52V19Ah only fits 19" and 21" Frame

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"
Motor Power

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


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

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
Drive Train

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

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

Canvas Pannier Bags
Canvas Pannier Bags

These Canvas bags offer great convenience and carrying capacity!


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

Shipping: Leaves within 6-7 business days
Sale price $2,949.00 Regular price$4,499.00
Lifetime Support
14 Days Return
Custom Built
Want to see the bike live?

Book a live showroom demonstration and see the bike live today!


Miles Range


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.

Performance. Fully Loaded.

Mid-Drive Motor

The Bafang Ultra M620 mid-drive motor features1000 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 important information about your ride including speed, battery life, odometer, pedal assist level and more.

Thumb Throttle & Control Pad

With just a push of the thumb, you can access all of the power the motor has to offer. No need to pedal, just sit back and enjoy the ride.

Suspension Fork

The RST Guide fork provides 80mm of travel with pre-load, lockout, and rebound adjustability.


From climbing hills to holding maximum speed on the flats, the Shimano 9-speed drivetrain has you covered.

Hydraulic Disk 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 & Rear Light

The ultra bright front & rear LED lights are powered by the bike's battery and can be turned on/off with a button on the handlebar control pad.

Optional Range Extender

Multiple range-extender battery options can expand your eBike's range all the way to 100 miles. (160km on .CA site)

Rack & Fenders

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

Technical Specifications


6061 aluminum

front hub

135mm 36h

seat post



Rst guide w/75mm travel, lockout and preload

front axle

5mm qr

seat post clamp



Threadless 1-1/8 1-1/2 tapered

rear hub

197mm 36h


Bafang ultra m620

shifter rear

Shimano alivio 9 speed trigger shifter

rear axle

12mm thru

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


Black 36h 26" w/ round cutouts




9 speed 11-34t cassette

tire sizes

26x4", 27.5x3"


Integrated headlight, integrated taillight


Kmc e9s


700mm wide, 50mm rise w/ 31.8mm clamp

assist type

Torque + cadence

crank set

170mm arms 44t chainring


90mm solid

assist levels


bottom bracket

Bafang ultra isis


Slide-on comfort grips


Thumb throttle


Tektro e350 dual-piston brakes w/ 160mm rotors


Wide saddle


Front and rear fenders, rear rack, kickstand

brake levers

Tektro adjustable w/brake cutoffs

Size & Fittings

1 Effective Top Tube Length 570mm 22.4in
2 Seat Tube Length (Classic Bike Size) 420mm 16.5in
3 Reach 460mm 18.1in
4 Stack 560mm 22in
5 Chainstay Length 510mm 20.1in
6 Standover Height 690mm 27.2in
7 Head Angle 71° -
8 Seat Angle 73.5° -
9 Head Tube Length 190 mm 7.5 in
10 Fork Length 530mm 20.9in
11 Front Center 700mm 27.6in
12 BB (Bottom Bracket) Drop 70mm 2.8in
13 Fork Offset 35mm 1.4in
14 Wheelbase 1220mm 48in
15 Total Length 2000mm 78.7in
16 Max Seat Height 990mm 39in
17 Min Seat Height 830mm 32.7in
18 Handlebar Height 1120mm 44.1in
19 Weight (Without Battery) 33.1kg 73lb
1 Effective Top Tube Length 610mm 24in
2 Seat Tube Length (Classic Bike Size) 470mm 18.5in
3 Reach 480mm 18.9in
4 Stack 570mm 22.4in
5 Chainstay Length 510mm 20.1in
6 Standover Height 730mm 28.7in
7 Head Angle 71° -
8 Seat Angle 73.5° -
9 Head Tube Length 190 mm 7.5 in
10 Fork Length 530mm 20.9in
11 Front Center 710mm 28in
12 BB (Bottom Bracket) Drop 70mm 2.8in
13 Fork Offset 35mm 1.4in
14 Wheelbase 1240mm 48.8in
15 Total Length 2020mm 79.5in
16 Max Seat Height 1040mm 40.9in
17 Min Seat Height 880mm 34.6in
18 Handlebar Height 1140mm 44.9in
19 Weight (Without Battery) 34kg 75lb
1 Effective Top Tube Length 630mm 24.8in
2 Seat Tube Length (Classic Bike Size) 520mm 20.5in
3 Reach 500mm 19.7in
4 Stack 580mm 22.8in
5 Chainstay Length 510mm 20.1in
6 Standover Height 760mm 29.9in
7 Head Angle 71° -
8 Seat Angle 73.5° -
9 Head Tube Length 190 mm 7.5 in
10 Fork Length 530mm 20.9in
11 Front Center 720mm 28.3in
12 BB (Bottom Bracket) Drop 70mm 2.8in
13 Fork Offset 35mm 1.4in
14 Wheelbase 1260mm 49.6in
15 Total Length 2040mm 80.3in
16 Max Seat Height 1080mm 42.5in
17 Min Seat Height 920mm 36.2in
18 Handlebar Height 1150mm 45.3in
19 Weight (Without Battery) 34.4kg 75.8lb

Need A Hand?

Chat With Us
We are always excited to hear from you. Just click the button below to activate chat now.
Chat Now
Book A Virtual Demo
Our eBike specialists can help you find your dream eBike and answer any questions you may have.
Book An Appointment Now
Give Us A Ring
24/7 e-mail support. 8/5 phone and live chat with eBike Specialists to help you in anyway.

Customer Reviews

Based on 30 reviews
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.

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

Landon Lake
Jaggernaut Ultra Duo 2 Step Over

I went on vacation and got home to my new BikTrix Jaggernaut Ultra Duo 2 Step-Over Camo Bike. Was easy to get together and get started. I charged up the battery and put 20 miles on it my first day. This bike is really fun! I am 40 years old but honestly feel like a kid again riding this bike. The customer service was great! They helped me find what would work for me and answered all my question promptly throughout the process. This Bike is awesome!!

travis luck
Juggernaut Ultra Duo 2 Step-Over

Great bike!

Gary Dobbins

I don’t need that battery??? (Aphasia)

pier Nilsson mariano
Great bike and exceptional costumer support

I recieved my bike here in Sweden a few days ago, and I am super-satisfied. It shines quality from every single component.
I must also mention the great costumer and technical support. I got answers very rapridly to all my questons, and the people at Biktrix are really kind and helpful. So far a great experience from every point of view

David Martindale
Juggernaut Ultra Duo 2 Step-Over

The Biktrix company has been very easy to work with. The customer service during the ordering process was very helpful. It was shipped using quality materials. I am mechanically inclined but this was my first bike assembly and it only took about 45 mins. There are only a few things for the buyer to assemble. I've had the bike about 2 weeks now and have put about 80 miles on it. It is clearly a quality built bike with lots of power. I have a bum knee which I am slowly rehabing so on a battery testing trip I pedaled consistently but leaned heavily on the pedal assist with a bit of "throttle only" as well. Averaging about 15 mi/hr, I completed a 34 miles trip with 9% left in the single stock battery. I really like the pannier bags and center bar storage bag. I recommend the upgraded seat. The standard one is ok but my butt was sore after the 34 miles. I put the upgraded seat on and life is good now. One of my students works for a bike shop doing their repairs. He was impressed with the quality and made mention of the problems they have with a number of the other leading brand ebikes.

Best bike ever

Just ride

William Hanley

I have two of your bikes with less than 200 miles and the chains keep falling off, once on the way home from having the derailleur and hanger professionally replaced. The other one always skips and destroyed first and second gears Those gears were made for human legs to be shifting them, not a thousand-watt motor. I am riding a Schwinn. Keep the $8000.