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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.

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


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, 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 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

Size & Fittings

17" Step-Over Medium 19" Step-Over Large 21" Step-Over Extra-Large

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Customer Reviews

Based on 33 reviews
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

tim donohue
Bike was defective

The bike had problems that I could not fix by computer. I arranged to re box the bike and drive 200 mi to Biktrix dealer in Eugene . The dealer "Electric Ave" shipped the bike to you, and are waiting for Biktrix to send the replacement bike.
They will assemble the new bike there ( costing me $150.00) and I will drive back to Eugene and pick up the bike. I already own a Jug Classic, had it for 2 yrs and love it! put on 2,000 mi.s and still in great shape . I really love my Biktrix bike , that's why I'm willing to drive all the way to Eugene and back "twice" and fork out another $150.00 . Because I know Biktrtix makes great bikes. I'll up grade this rating , after i get the bike. Tim Donohue

Hi Tim, it appears that your issue was resolved. We hope that you can revise this review based on the service you received.

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.


From ordering to delivery the service was amazing and the bike is great exactly what I wanted. Thank you.

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