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Juggernaut Ultra FS Pro 3 Fat

Sale price $4,149.00 Regular price$4,699.00

Biktrix Holiday Sale!  No Code needed. $550 off MSRP. Limited stock 🚨

The FS Pro 3 Fat has the epic performance of the Full suspension frame and Mid drive Ultra motor with the Fat tires delivers maximum grip on soft terrain and comfort on hard terrain

**Larger frames will have a higher bar connecting the top-tube and seat tube
Brushed Aluminum
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.

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
Motor Power

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


Elevate your ride's comfort and control by upgrading your ebike fork, ensuring a smoother journey over any terrain.


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
Rear Hub

Upgrade your eBike's rear hub for a smoother, more efficient ride, unlocking enhanced performance and reliability with every pedal.

Dropper Seatpost

Suspension seatposts offer great riding comfort as they absorb many of the imperfections on the road/trail.

***Adding a dropper seatpost to your eBike will increase the minimum seatpost height by approximately 75mm/3"
Rear Rack And Fender

This rear cargo rack with a solid, integrated fender will keep you nice and dry while riding, allowing you to carry all the cargo you may want on the rear end of your bike!

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!


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

Shipping: Leaves within Late September
Sale price $4,149.00 Regular price$4,699.00
Lifetime support
14 Days Return
Custom Built


Miles Range


Torque For Extreme Hills

52V 17Ah

Strong, Reliable Battery

Full Suspension. Full Performance.

Top-of-the-line components and the most powerful torque-sensing mid-drive motor in the industry makes the Juggernaut Ultra FS Pro 3 the best-built full-suspension electric bike on the market. Now available with an optional range extender battery to add on additional range! New to this version is a rear triangle wide enough to support 4.8" tires!

Maximum Traction

With a quality FS system, both wheels stay connected with the ground. That means better handling and higher speeds on tough terrain. This bike is built for the trail.

Soar Through All Terrian.

The 26x4 or optional 26x4.8” Fat Tires have a large contact patch to provide improved traction on challenging loose terrain such as loose dirt, sand, mud, snow and rocks. The extra width also increases the bike’s stability - useful for riding technical terrain or tackling obstacles at low speeds.

Ultra Power. Greater Features.

Bafang Ultra M620 Mid-Drive System

The Bafang M620 system features the G510 electric motor with over 1500 watts of peak power, 160Nm of torque and torque-sensing assist. Span cities, climb hills, and explore all the places you want to go with ease.

Rockshox Rear Suspension

The rear suspension sets the Ultra FS Pro apart from the rest of our lineup, making it the ultimate eBike. Take on any trail with maximum comfort and control

Optional Range Extender

On top of the stock 52V 17Ah battery add on a range extender battery to gain additional range

Front Suspension

The Biktrix Inverted Suspension Fork features 100mm of travel, adjustable preload and adjustable lockout


The SRAM NX 11-speed drivetrain has the versatility to provide max torque while climbing hills and max speed on the flats.

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.

LCD Display

The LCD Display shows you 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.

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.

Technical Specifications

Size & Fittings

1 Effective Top Tube Length 580mm 22.8in
2 Seat Tube Length (Classic Bike Size) 430mm 16.9in
3 Reach 440mm 17.3in
4 Stack 540mm 21.3in
5 Chainstay Length 510mm 20.1in
6 Standover Height 730mm 28.7in
7 Head Angle 63° -
8 Seat Angle 72° -
9 Head Tube Length 160 mm 6.3 in
10 Fork Length 540mm 21.3in
11 Front Center 810mm 31.9in
12 BB (Bottom Bracket) Drop 40mm 1.6in
13 Fork Offset 40mm 1.6in
14 Wheelbase 1320mm 52in
15 Total Length 2030mm 79.9in
16 Max Seat Height 1040mm 40.9in
17 Min Seat Height 840mm 33.1in
18 Handlebar Height 1020mm 40.2in
19 Weight (Without Battery) 32.6kg 71.9lb
1 Effective Top Tube Length 600mm 23.6in
2 Seat Tube Length (Classic Bike Size) 480mm 18.9in
3 Reach 460mm 18.1in
4 Stack 590mm 23.2in
5 Chainstay Length 510mm 20.1in
6 Standover Height 740mm 29.1in
7 Head Angle 63° -
8 Seat Angle 72° -
9 Head Tube Length 160 mm 6.3 in
10 Fork Length 540mm 21.3in
11 Front Center 810mm 31.9in
12 BB (Bottom Bracket) Drop 40mm 1.6in
13 Fork Offset 40mm 1.6in
14 Wheelbase 1330mm 52.4in
15 Total Length 2040mm 80.3in
16 Max Seat Height 1080mm 42.5in
17 Min Seat Height 880mm 34.6in
18 Handlebar Height 1060mm 41.7in
19 Weight (Without Battery) 32.6kg 71.9lb
1 Effective Top Tube Length 600mm 23.6in
2 Seat Tube Length (Classic Bike Size) 520mm 20.5in
3 Reach 460mm 18.1in
4 Stack 590mm 23.2in
5 Chainstay Length 520mm 20.5in
6 Standover Height 770mm 30.3in
7 Head Angle 63° -
8 Seat Angle 72° -
9 Head Tube Length 160 mm 6.3 in
10 Fork Length 540mm 21.3in
11 Front Center 810mm 31.9in
12 BB (Bottom Bracket) Drop 40mm 1.6in
13 Fork Offset 40mm 1.6in
14 Wheelbase 1340mm 52.8in
15 Total Length 2060mm 81.1in
16 Max Seat Height 1120mm 44.1in
17 Min Seat Height 940mm 37in
18 Handlebar Height 1060mm 41.7in
19 Weight (Without Battery) 33.6kg 74.1lb

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Customer Reviews

Based on 247 reviews
Juggernaut FS Pro 3

This is my first Ebike. I wasn't sure what to expect. This bicycle far exceeds my expectations.
Assembly is easy for 1 person. Fit and Finish and Quality is awesome.
I rode it for the first time around my driveway and yard without the battery power turned on. I was very impressed
with how easy it was to peddle, it felt like a regular mountain bike.
Next I took it on a 7 mile ride with the battery power, I toggled through all the pedal assist levels and used the throttle only.
I couldn't stop saying to myself WOW, this bike is a blast to ride.
When I purchased this bike I selected the Sulfur Yellow powder coating (beautiful powder coating job, I love the color) I also opted for the upgraded Tektro Quad Piston brakes (fantastic brakes, they work very well)
The Armageddon Headlight (very bright) The Wren Star Ratchet Rear Hub and the Rear rack and fender set.
I am still fine tuning the suspension, seat and handle bar placement to make it all perfect for me.
I'm looking forward to many fun miles of riding, Thank You Biktrix.

earl vandenberg

Very impressed with the bike and the service has been excellent.

Kevin Knodel
Sent out replacement hardware

Very happy with final resolution

Christoph Gschossmann
Juggernaut fs pro 3

I love the bike lots of power and it’s a lot of fun riding

Douglas Gedak
Simply Astonishing

Super happy with the quality of my new bike. I took to the steepest city path hill, I was astonished at the true strength and ease the climb was. My previous e-bike could not make it.

Chris Robertson
Frank the Tank

Bike is really nice! A bit heavy. Could use a bit more speed! Nice Bike

Rudolf Würfl
Great bike

Till now i only drove on asphalt roads, this was really great.
The following weeks i will Test it on gravel and Im sure that the bike is also great there.

Meredith Eisner

Juggernaut Ultra FS Pro 3

Ultra FS is a lot of fun

I fell I am on a monster truck and nothing can stop me. This bike is a tank. 110% understand why it is named juggernaut. Bike is rated 265 but I am over 300lbs. I am achieving acceptable SAG in rear and front suspension with air at maximum recommended by manufacturers. I love it. All my friends want one.

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