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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 11 reviews
Best bike ever

Just ride

Rich Medcraft
Biktrix Juggernaut Ultra Duo 2 Step-Over

Very nice bike. Amazingly fast turnaround. Received new bike within 2 weeks. Well packaged and easy to assemble. A lot of fun!

Doug Enemark
lots of torque

This is a very nice powerful bike. I will probably replace the cassette with one thats a little more stout because of the torque this bike has. You really need to learn how to use your gears properly. Just a minor learning curve after having a hub drive before this bike. The mid drive is so much smoother than the hub drive. really loving it.

Wayne chernick
First Ebike

I had ridden one and liked it. I purchased my first Juggernaut Ultra and it is an awesome Ebike.

Michael Hildebrandt
Juggernaut Ultra Duo 2 step-over & Step Thru

My wife and I just bought the Ultra Duo 2 step-over and Step-thru and we are really pleased with these bikes thus far. We have already put on over 200km including a 100km round trip on the Lockside and Galloping Goose trails near Victoria BC. from the Schwartz bay ferry terminal.

Robert Giroux
Juggernaut Ultra Duo 2 Step-Over,Awesome bike!

Juggernaut Ultra Duo 2 Step-Over,Very easy assembly of the bike,the computer is friendly user,I am 58 years old and feel like a kid again.

david ortman

Still waiting for it to arrive

roland hanser
As advertised and expected

Easy to assemble and good communication with dedicated staff.

Luke Gebicke
Great Reliable Bike, tons of power, better than my radpower

I'll compare this bike to my only other experience with a Radpower Radwagon 4.

The biktrix is a great bike and feels better built. The 26x4 Fat tires are excellent and have lots of stability. There is some noise from the Kenda Juggernaut on the road but that's to be expected for the off road bias tire. I would like to see a more 50/50 tire balanced for more road, for me. Offroad only the tires are excellent

If I had to buy a bike again...between the Radpower and Biktrix...I'd definitely pick Biktrix.

I'm taking off one star for the only negative I have is the surprise maintenance requirement for the mid-drive motor in that it's recommend it be regreased every 1000 miles or every 6 months (I think). Often enough it's going to be common for me to perform. Unfortunately the process requires removal of the motor AND motor housing...and I find that local bike shops won't do that service due to the complexity. Something to consider that you'll have to deal with later. It would be nice if there could be a grease fitting on the motor allowing for easy application or an easier removal process for getting to the motor gears for cleaning and regreasing.

Biktrix support does have a video detailing the regreasing process but it's oddly voiced and again probably more complex than most bike owners (and bike shops) will do.

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