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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.


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 important information about your ride including speed, battery life, range, 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 Renegade coil spring fork provides 100mm of travel with pre-load and lockout adjustability


From climbing hills to holding maximum speed on the flats, the SRAM NX 11-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 Light

This bright LED light is 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.

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

Size & Fittings

16" Step-Thru 17" Step-Over 18" Step-Thru 19" Step-Over

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Customer Reviews

Based on 67 reviews
Nick Maggio
I Love/Hate my Juggernaut Ultra Duo

I settled for a Juggernaut Ultra Duo with a Step-Thru frame to get my bike a little quicker. I purchased it through an Indiegogo campaign and initially ordered a step over but thought it would be nice with the ease of getting on and off, especially for an older fellow like me. Unfortunately I've had nothing but weird issues with it since delivery. Less than 200 miles since I first received it end of winter 2020. There were immediate issues with the speed sensor magnet and its spoke contact point. Then numerous PAS problems requiring all kinds of emails to Biktrix. I had to push unusually hard on the crank to get anything in return equaling the selected mode. They sent me a throttle and a display in attempt to solve the issues which I somehow imagined it worked a little better after installing them. I really didn't know what to expect with the bike's performance to begin with. This past summer after not riding the bike for a few months being away, the PAS was suddenly non existent and it only had throttle response. Contacted Biktrix and set up an another video chat and using a phone tripod to demonstrate to the technician on the call that the PAS was indeed not working.
They agreed to have me send the motor to them and suggested I find an e-bike shop to have the work done.
Thankfully I found a e-bike manufacturer about an hour away from home. Had the motor removed and shipped it to Biktrix. Upon their inspection they replaced the torque sensor and possibly the controller. This all wound up costing me well over $600.00 total by time it was all said and done. I got very disgusted with it all and reluctantly left Biktrix a two star review, just recently. The owner Roshan Thomas completely whitewashed everything I tried to say in reply and even claimed they sent me instructions how to remove the motor myself with three little bolts! I happen to be very handy with tools, was an engineer on a US destroyer and even built several of my own motorized bikes over the years. I would have gladly saved myself the money and time if Biktrix offered me that choice they made seem too delicate for me to do. They even suggested at first "I find a box" and send the entire bike to them in Canada, and of course at my expense! They certainly never said anything of the sort about me removing the motor myself.
Said I was too hard to please and that I had unrealistic expectations. Ultimately accused me of ruining the motor "being in the wrong gear".
He compared it to driving a Porsche and winding it out at top speed in the wrong gear until motor failure. The irst time I rode it I had to learn to start off in a higher gear and shift being mid-drive. These invaluable instructions did not come with the bikes delivery or by email if that could have possibly been the problem.
I felt Biktrix could have easily absorbed the motors cost of repair instead of charging me $200US for the motor's premature failed parts which I truly believe (without any doubt) came with some poor quality control issues from Bafang in China. Parts are parts and sometimes they just fail. The M620 Ultra is pretty much a proven powerhouse. I came no where near being able to push it hard enough for what they claimed happened to it.
It was bad enough just getting the beast of an 80+ lb. bike to Chicago and paying them $400 just to remove the motor and replace it after it was fixed. I was also reminded how I got a "huge discount" because I bought the bike on the campaign. I was treated like I should settle for the problems because I got a discount and to just go on and be grateful....Thankfully my bike is finally fixed I believe, however I'm still waiting for warmer weather to take it out long enough to know for absolute sure. Now after the motors repair, when I push on the crank the bike responds like it's suppose to in whatever mode is chosen. It never responded like that before, so I know it had something happening to it before it's questionable I year warranty "conveniently expired".
My wife and I have had two Rad Power bikes for many years now and we have never had one problem with either of them. However, they are hub drive and not near as complicated nor as fragile as the Juggernaut seems to be...
I just wished Biktrix owner would have seen the opportunity to be more considerate of my problems that were no fault of my own instead of focusing on trying to make a concerned customer look like some inconsiderate moron.
I wound up removing my review from Biktrix website as it wasn't going to do any good, especially after the owners BS convincing reply. And I'm not sure if my energy spent here will do any good either, however I believe more people should take their time to express an honest review and perhaps help others make better decisions on a product or a company whether good or bad... My advice to anyone concerned here is to buy from a reputable e-bike company you can trust and one that is as close to home as possible. Peace & Happy Riding!

Hi Nick, your review was completely one sided on Google and I added complete timeline of events based on the numerous conversations that you've had with my team. Here you are again, trying to put in a review that is completely based on what you feel happened than what actually happened. The one thing you did get right in your latest review is 'the first time I rode it I had to learn to start off in a high gear and shift being a mid-drive. These invaluable instructions did not come with the bikes delivery ... that could have been the problem'. This ABSOLUTELY is a major factor in what caused the problems. Sorry that we don't send instructions with the bike on how to use bike gears. There are 100s of videos on how to remove a Bafang M620 motor off a bike on youtube and our support site (support.biktrix.com). You claim that we didn't offer to ask you if you were capable of doing that. Unfortunately, we have no idea what the technical expertise of each customer is. We tried to find the easiest solution for you - finding an expert to help. End of the day, I apologize if your expected level of service wasn't met. We did certainly try our best to help you.

- Roshan

As much as I wish that you had this conversation one-on-one with me via email, I have to leave a public reply here so that your review is not one sided.

Just for context for anyone else reading, here is a copy of my reply to your original review:
Hi Nick,
Thanks for taking the time to leave a review. I’d like to clarify a few items that you’ve mentioned above that are not factual.
First: yes, you backed an Indiegogo campaign in December and received your bike earlier than promised in February. You contacted us on Feb 24 stating that you were disappointed with the range that you were getting on your bike. Our support staff Ricky walked you through what you need to do to achieve advertised range. This included checking the voltage of the battery, making sure that it’s charging and balancing properly. This conversation(back and forth email support ended Feb 25).

On Mar 22, you emailed us again stating that your brother bought the same bike and he’s also having range issues. Our support staff Ryan phoned you and talked to your brother and explained how the motor efficiency drops substantially if gears were used improperly, etc.

On 4 October, you emailed us on behalf of your brother saying that his pedal assist isn’t working and that he’s very irate. Then on 5 Oct, you emailed that your bike is showing an issue where the pedal assist isn’t working. Our agent Tej asked you some basic debugging questions to eliminate brake cutoffs (common suspect) and display from the issues. Upon asking you these questions, you sent photos of the display showing error 4 and error 21. Error 4 is throttle related and error 21 is speed sensor related. He asked you to disconnect/reconnect the throttle and see if error 4 goes away and sent you instructions on adjusting the speed sensor for error 21. Note that both these errors can clause intermittent pedal assist issues. He then asked you to book a video call to further debug. Then you emailed back saying the bike was working fine now (with throttle disconnected)and if anything needed to be done for the error codes. Newton sent out a replacement throttle for free under warranty.

You then emailed us on 7 Oct stating that your brother had err 21 on his bike and if he needed to replace the sensor. Newton advised you too ask him to check the magnet alignment on the wheel which is the most common issue that causes error 21. Then you emailed saying that you shimmed out the sensor on your bike and error 21 seems to have gone away.

On Oct 12 you emailed back saying error 21 didn’t go away on yours and your brothers bike. So we sent out replacement speed sensors and displays to both of you.
Then you worked with one of our support staff again and we sent out a main wiring harness. Then on Oct 29, 2021 you said everything worked fine.

Then on Nov 2 2022: you emailed saying you’re continuing to have issues. At this point, we asked you to remove the motor and send it back to us. Motor is bolted on to the bike with 3 bolts. We sent you instructions on how to take that off and send it to us.

On Nov 29, 2022: we sent you an authorization to send the motor back again as you hadn’t sent it yet. On Nov 30th you emailed saying you paid a different company to remove the motor etc.

Once we got the motor we figured out that your controller was damaged due to excess heat. This usually happens when the wrong gears are used to ride the bike. Eg. Driving a Porsche at top rpm on the wrong gear will cause motor/transmission premature wear. We quoted you a discounted rate of $235 for the controller and said that we’ll cover labor under warranty. Even though your warranty expired well almost a year prior. After going back and forth for a few emails you eventually paid for the controller work to be done. We completed this promptly and sent back the motor as promised.

Now, here we are in Jan 2023 and you leave us a 2* review with a lot of one sided info that’s not representative of the whole story. Since I’ve now added colour to the story, any reader should be able to see that we really did our best to support you. We’ve sent out hundreds of dollars worth of parts. Even though your bike was an indiegogo purchase which only came with a 90day parts warranty (in exchange for the huge discount you bought the bike at), we continued to support you for 2 whole years.

Some people are just hard to please. We’re sorry that we couldn’t meet your unrealistic expectations.
Yes, we have 15 bad reviews of the 15,000+ bikes that we’ve sold. Go figure.

Linda Smith
Gray Hair Lady and a Juggernaut

More fun than I have had in a very long time. I am not a very adventurous person but a good friend convinced me to get one. LOVE IT. Every time I venture out I get braver. Highly recommend.

Raymond Schiller
Duo 3 Step Thru

Love it

Judy Severson
Best Ebike!!

I love my Juggernaut Ultra Duo 3! We have gone on many adventures through lots of different terrain. It’s great on gravel, grass, uneven dirt trails and anything I’ve tried it on. With my extra battery I’m not afraid to take long trips!

Laura Robinson
Love this bike!!!

I absolutely love this bike! I’m back on the trails after being crippled for 7 years. I feel like my old self! The staff is very helpful too! The coral pink is beautiful. I can’t say enough good things about biktrix!

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