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Juggernaut Ultra Duo 3 Step-Over

Still Interested in the Juggernaut Ultra Duo Step-Over? Check out the Juggernaut Ultra Duo Step-Over 2 below!

Juggernaut Ultra Duo 2 Step-Over
1000W Mid-Drive

Motor Power

52V 17Ah 910Wh

est. 45mi Range

+5'6ft / 380lb

Max Load

Cadence + Torque Sensor

Powerful Pedal Assist

On-Demand Throttle

Pedaling Optional

25+ Point Quality

Control Checklist

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90+

Miles Range

160Nm

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.

Distance Range

PAS 1
Pedal-Assist Lv.1
52mi
PAS 2
Pedal-Assist Lv.2
43mi
PAS 3
Pedal-Assist Lv.3
38mi
PAS 4
Pedal-Assist Lv.4
35mi
PAS 5
Pedal-Assist Lv.5
31mi
THRL
Throttle Only
22mi
**Please note that information regarding the expected range on a single charge on one of our e-bikes is an estimate, not a guarantee. There are many factors that contribute to the actual, real-world range for an e-bike battery such as the age of the battery, temperature, level of assist, speed, payload, and terrain. Depending on these various conditions, it is possible to get less than the expected minimum range or greater than the expected maximum range.

Technical Specifications

Frame
6061 aluminum
Front hub
150mm 36h
Seat post
Aluminum 28.6mm
Fork
Rst renegade coil spring w/100mm travel, lockout & preload
Front axle
15mm qr-thru axle
Seat post clamp
Qr
Headset
Threadless 1-1/8 1-1/2 tapered
Rear hub
190mm 36h
Motor
Bafang m620 ultra
Shifter rear
Sram 11 speed trigger shifter
Rear axle
5mm qr
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
Sram nx 11 speed
Rims
Black 24", 26", 27.5" 36h
Display
Dpc-18
Cassette
11 speed sram 11-42t cassette
Tire sizes
24x4", 26x4", 27.5x3"
Lights
Integrated headlight, taillight
Chain
Kmc e11s
Handlebar
650mm wide mtb w/30mm rise, 31.8mm clamp
Assist type
Torque + cadence
Crank set
44t 170mm arms
Stem
90mm adjustable
Assist levels
0-5
Bottom bracket
Bafang isis
Grips
Slide-on comfort grips
Throttle
Thumb throttle
Brakes
Biktrix dual piston hydraulic w/ 180mm rotors
Saddle
Biktrix spring supported comfy cruiser
Other
Front and rear metal fenders, rear rack, kickstand
Brake levers
Biktrix w/ adjustable reach and motorcutoffs
Rear suspension
N/a (l | 19" so)/none (l | 19" st)/none (m | 17" so)/none (m | 17" st)
Frame
6061 aluminum
Front hub
150mm 36h
Seat post
Aluminum 28.6mm
Fork
Rst renegade coil spring w/100mm travel, lockout & preload
Front axle
15mm qr-thru axle
Seat post clamp
Qr
Headset
Threadless 1-1/8 1-1/2 tapered
Rear hub
190mm 36h
Motor
Bafang m620 ultra
Shifter rear
Sram 11 speed trigger shifter
Rear axle
5mm qr
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
Sram nx 11 speed
Rims
Black 24", 26", 27.5" 36h
Display
Dpc-18
Cassette
11 speed sram 11-42t cassette
Tire sizes
24x4", 26x4", 27.5x3"
Lights
Integrated headlight, taillight
Chain
Kmc e11s
Handlebar
650mm wide mtb w/30mm rise, 31.8mm clamp
Assist type
Torque + cadence
Crank set
44t 170mm arms
Stem
90mm adjustable
Assist levels
0-5
Bottom bracket
Bafang isis
Grips
Slide-on comfort grips
Throttle
Thumb throttle
Brakes
Biktrix dual piston hydraulic w/ 180mm rotors
Saddle
Biktrix spring supported comfy cruiser
Other
Front and rear metal fenders, rear rack, kickstand
Brake levers
Biktrix w/ adjustable reach and motorcutoffs
Rear suspension
17" st)
Frame
6061 aluminum
Front hub
150mm 36h
Seat post
Aluminum 28.6mm
Fork
Rst renegade coil spring w/100mm travel, lockout & preload
Front axle
15mm qr-thru axle
Seat post clamp
Qr
Headset
Threadless 1-1/8 1-1/2 tapered
Rear hub
190mm 36h
Motor
Bafang m620 ultra
Shifter rear
Sram 11 speed trigger shifter
Rear axle
5mm qr
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
Sram nx 11 speed
Rims
Black 24", 26", 27.5" 36h
Display
Dpc-18
Cassette
11 speed sram 11-42t cassette
Tire sizes
24x4", 26x4", 27.5x3"
Lights
Integrated headlight, taillight
Chain
Kmc e11s
Handlebar
650mm wide mtb w/30mm rise, 31.8mm clamp
Assist type
Torque + cadence
Crank set
44t 170mm arms
Stem
90mm adjustable
Assist levels
0-5
Bottom bracket
Bafang isis
Grips
Slide-on comfort grips
Throttle
Thumb throttle
Brakes
Biktrix dual piston hydraulic w/ 180mm rotors
Saddle
Biktrix spring supported comfy cruiser
Other
Front and rear metal fenders, rear rack, kickstand
Brake levers
Biktrix w/ adjustable reach and motorcutoffs
Rear suspension
17" st)

Size & Fittings

1
Effective Top Tube Length
590mm 23.2in
2
Seat Tube Length (Classic Bike Size)
470mm 18.5in
3
Reach
440mm 17.3in
4
Stack
660mm 26in
5
Chainstay Length
510mm 20.1in
6
Standover Height
730mm 28.7in
7
Head Angle
70° -
8
Seat Angle
73° -
9
Head Tube Length
180 mm 7.1 in
10
Fork Length
540mm 21.3in
11
Front Center
730mm 28.7in
12
BB (Bottom Bracket) Drop
60mm 2.4in
13
Fork Offset
40mm 1.6in
14
Wheelbase
1230mm 48.4in
15
Total Length
2000mm 78.7in
16
Max Seat Height
1050mm 41.3in
17
Min Seat Height
880mm 34.6in
18
Handlebar Height
1140mm 44.9in
19
Weight (Without Battery)
35kg 77.2lb
1
Effective Top Tube Length
540mm 21.3in
2
Seat Tube Length (Classic Bike Size)
460mm 18.1in
3
Reach
500mm 19.7in
4
Stack
540mm 21.3in
5
Chainstay Length
520mm 20.5in
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
540mm 21.3in
11
Front Center
730mm 28.7in
12
BB (Bottom Bracket) Drop
50mm 2in
13
Fork Offset
40mm 1.6in
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
1100mm 43.3in
19
Weight (Without Battery)
35kg 77.2lb
1
Effective Top Tube Length
590mm 23.2in
2
Seat Tube Length (Classic Bike Size)
420mm 16.5in
3
Reach
440mm 17.3in
4
Stack
660mm 26in
5
Chainstay Length
500mm 19.7in
6
Standover Height
690mm 27.2in
7
Head Angle
70° -
8
Seat Angle
73° -
9
Head Tube Length
180 mm 7.1 in
10
Fork Length
540mm 21.3in
11
Front Center
720mm 28.3in
12
BB (Bottom Bracket) Drop
60mm 2.4in
13
Fork Offset
40mm 1.6in
14
Wheelbase
1230mm 48.4in
15
Total Length
2000mm 78.7in
16
Max Seat Height
1000mm 39.4in
17
Min Seat Height
830mm 32.7in
18
Handlebar Height
1120mm 44.1in
19
Weight (Without Battery)
34kg 75lb
1
Effective Top Tube Length
580mm 22.8in
2
Seat Tube Length (Classic Bike Size)
420mm 16.5in
3
Reach
580mm 22.8in
4
Stack
490mm 19.3in
5
Chainstay Length
480mm 18.9in
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
540mm 21.3in
11
Front Center
710mm 28in
12
BB (Bottom Bracket) Drop
40mm 1.6in
13
Fork Offset
40mm 1.6in
14
Wheelbase
1240mm 48.8in
15
Total Length
1960mm 77.2in
16
Max Seat Height
1000mm 39.4in
17
Min Seat Height
830mm 32.7in
18
Handlebar Height
1160mm 45.7in
19
Weight (Without Battery)
34kg 75lb

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Customer Reviews

Based on 104 reviews
70%
(73)
12%
(12)
10%
(10)
2%
(2)
7%
(7)
l
leonard Cervo
Ultra duo 3

Received e-bike, very easy to finish set up of bike. Already been on two rides

D
DAVID MC GAVOCK
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.

T
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

m
mark steiner
Wonderfully capable EBike

II am 66 years old. have had my UD3 for about 4 months now. In that short timeframe I have logged over 2500 miles on it. Riding It is so much fun that hasn't been hard to do. It is in charge and it gets noticed. I ride it on roads, trails and in the woods. This bike cannot be stopped, I and have yet to see another bike that can outperform it at any price. It will climb just about anything, as long as you can stay in the saddle! It is a big powerful bike that might take a little getting used to at first due to the sheer size and weight of it. But it is precisely the size, weight and power of this bike that make it such so exceptional and comfortable. You will ride with complete confidence in your newfound "partner" and it will not let you down. Get the extra battery (you will not want to get off this bike) and the Magura brake upgrade and it is even better! It has opened up a whole new world, conquering terrain a lesser bike could not dream of tackling It is worth every cent I paid for it. It is superb. As for the people who work for Biktrix, they are second to none.

L
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!!

D
Donald Martin
Juggernaut Ultra Duo 3

They say to save the box just in case. Well guess what, they never getting this thing back. It's mine now! I did a good amount of research beforehand and although I was a little skeptical because of the price and a couple of bad facebook reviews, I could not be happier with my decision to go with Biktrix. Customer service sent out a replacement front brake rotor that was damaged during shipping and I had it in my hands two days later. Canada to Louisiana in just two days! The bike rides like the wind and everything about it is high quality. I can comfortably recommend this bike and company with confidence. And yes, I'll be discarding the box.

m
mark steiner
The Freedom of a fat tire Ebike

I have owned the UD3 for several months now and riding season is just getting started. A fat tire Ebike is the way to go for anyone, because of its versatility. It can be a little difficult to load and unload due to its size and weight, but they make tilting bike racks that easily overcome that.

The bike is a joy to ride both on the road and on trails. But off-road it where it really shines. It is such a blast to ride. Provided you can stay on the bike, it will conquer any hill you can imagine.

i researched Ebikes heavily before deciding on this bike. I compared the components, specs and price to dozens of other Ebike manufacturers, as well as the reputation of the company's customer service. The process took a while but I made the right choice. Other big name bikes that have the EXACT same specs and components are selling bikes for twice what a Biktrix bike will cost you. Don't be fooled by those big names.

Also Biktrix customer service is phenomenal.

So glad I got this bike. But enough of the boring testimony from me, I gotta go for a ride!

R
Robert H.
Biketrix Juggernaut Ultra Duo 3 First impressions

The bike is really heavy. With the standard battery it weighs in at about 80#. The chocolate brown color is more purple than brown. I’ve had 3 people tell me they like the purple color, so it’s not just me. I don’t dislike it, but it’s not what I expected.
The bike came near fully assembled, so basically, I only needed to attach the handlebars, front fender & light, and the front wheel. The rear tire was flat and had a hole in the tube from shipping, so I took it to a local shop and had it repaired. Also had them put some sealant in it. Aside from that, everything worked fine.
The frame is larger than I expected. I’m 5’9” with 30” inseam and the stand over height is almost too tall. If you're shorter than me, you'll want the step through version, or a shorter frame.
The bike rides great & I love the way it shifts through the gears. First ride I went 14 miles in eco mode PAS 5 and the battery indicated I had 82% left. The motor is reasonably quiet and has a LOT of power! It will cruise comfortably 25-26 mph in high gear. (I don't normally ride that fast...just wanted to try it out. )
I did manage to get a bunch of thorns in both tires. The rear tire with sealant was ok, but I had to take the front to the shop for repair and add sealant. The tires have good tread, but the casing seems kind of thin. I was going to go ahead and replace them, but discovered the 27.5 x 3 tire is an oddball size, and no one in Tulsa stocks that size tube or tire. They're also not listed on Biketrix’s website as a replacement part.
The handlebar grips were not very comfortable, so I replaced them with a pair of silicone grips.
I’m at about 50 miles now, and so far very pleased with bike. I do plan to have Biketrix update the program so the throttle works as a variable speed rather than just off and on, however I find I don't actually use it very much.
Stay tuned…I will update this after I get a few more miles on it.

T
Tyrell Hering

Juggernaut Ultra Duo 3 Step-Over