Biktrix Juggernaut Ultra FS Review

Biktrix Juggernaut Ultra Fs Electric Bike Review
Biktrix Juggernaut Ultra Fs
Biktrix Juggernaut Ultra Fs Sram Nx System
Biktrix Juggernaut Ultra Fs 100mm Travel Rear Suspension
Biktrix Juggernaut Ultra Fs Cockpit View
Biktrix Juggernaut Ultra Fs Rock Shox Bluto Front Suspension Fork
Biktrix Juggernaut Ultra Fs Display Controls Flat Locking Grips
Biktrix Juggernaught Ultra Fs Fat Tires
Biktrix Juggernaut Ultra Fs Banfang Mid Drive
Biktrix Juggernaut Ultra Fs Velo Plush Seat Hole Punched Rims
Biktrix Juggernaut Ultra Fs Front View
Biktrix Juggernaut Ultra Fs Rear View
Biktrix Juggernaut Ultra Fs Stock High Step Black
Biktrix Juggernaut Ultra Fs Stock High Step Ivory
Biktrix Juggernaut Ultra Fs Electric Bike Review
Biktrix Juggernaut Ultra Fs
Biktrix Juggernaut Ultra Fs Sram Nx System
Biktrix Juggernaut Ultra Fs 100mm Travel Rear Suspension
Biktrix Juggernaut Ultra Fs Cockpit View
Biktrix Juggernaut Ultra Fs Rock Shox Bluto Front Suspension Fork
Biktrix Juggernaut Ultra Fs Display Controls Flat Locking Grips
Biktrix Juggernaught Ultra Fs Fat Tires
Biktrix Juggernaut Ultra Fs Banfang Mid Drive
Biktrix Juggernaut Ultra Fs Velo Plush Seat Hole Punched Rims
Biktrix Juggernaut Ultra Fs Front View
Biktrix Juggernaut Ultra Fs Rear View
Biktrix Juggernaut Ultra Fs Stock High Step Black
Biktrix Juggernaut Ultra Fs Stock High Step Ivory


  • Purpose-designed fat-tire electric made for off-road use with a 1000-watt mid-drive motor, 14ah battery and top speed of 38mph, it looks like a bicycle but is classified more as a moped
  • Large 180mm, hydraulic disc brakes provide ample stopping power, which is great for an electric bike that goes as fast as this one, good weight distribution with the motor and battery mid-frame
  • The control center can be easily seen in direct sunlight and offers tons of pertinent information like speed, range, wattage output and more, with no rear suspension or seat post suspension it could get a little bumpy
  • Given the heavier weight, higher possible speeds here, and fat tires, it would have been great to see some even wider hub spacing and perhaps extra gussets to reduce frame flex

Video Review

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Juggernaut Ultra FS



Body Position:


Suggested Use:

Trail, Sand and Snow

Electric Bike Class:

Throttle on Demand (Class 2), Speed Pedelec (Class 3), Moped or Motorcycle (Class 4)
Learn more about Ebike classes


1 Year Limited


United States, Canada

Model Year:


Bicycle Details

Total Weight:

77.3 lbs (35.06 kg)

Battery Weight:

9 lbs (4.08 kg) (11.3lbs for 17.4ah and 21.0ah Batteries)

Motor Weight:

11.7 lbs (5.3 kg)

Frame Material:

6061 Aluminum Alloy

Frame Sizes:

19 in (48.26 cm)

Geometry Measurements:

Medium: 19” Seat Tube, 24” Reach, 28.5” Stand Over Height, 38” Minimum Saddle Height, 27” Width, 79” Length

Frame Types:


Frame Colors:

Matte Black with Neon Green Accents, Matte Silver with Neon Green Accents

Frame Fork Details:

Rockshox Bluto RL Air Suspension, 100mm Travel, Compression Adjust with Lockout, Preload Adjust, 150mm Hub Spacing, 15mm Thru Axle

Frame Rear Details:

DNM Burner RC3 Coil-Over Spring Suspension, Adjustable Rebound, Adjustable Compression, 190mm Hub Spacing, 12mm Thru Axle with Hex Bolt

Gearing Details:

11 Speed 1x9 Shimano Alivio Derailleur, Shimano HG Cassette 11-34 Tooth

Shifter Details:

SRAM NX1 Trigger Shifter


Lasco EB11, Alloy, 170mm Length, 42 Narrow/Wide Tooth Chainring with Double-Sided Alloy Chain Guard


Wellgo Platform Alloy with Fixed Pins


Tapered Headtube, 1-1/8" to 1-1/5"


Promax, Alloy, 100mm Length, Two 10mm Spacers


Promax, Alloy, 5° Rise, 5° Sweep, 690mm Length

Brake Details:

Tektro Dorado 710E Hydraulic Disc with 180mm Rotor Front and Rear, with Four-Finger Adjustable Levers with Motor Inhibitors and Shift Detection


Black Rubber with 3mm Locking Rings


Velo Plush with Gel, Black

Seat Post:

Rigid, Aluminium Alloy

Seat Post Length:

350 mm

Seat Post Diameter:

30.9 mm


Alloy, Single Wall, Punched Out, 36 Hole


Stainless Steel, 13 Gauge, Black with Stainless Nipples

Tire Brand:

Kenda Juggernaut, 26” x 4.0” (98-559)

Wheel Sizes:

26 in (66.04cm)

Tire Details:

5 to 30 PSI, 0.4 to 2.1 BAR

Tube Details:

Schrader Valve


Adjustable Length Kickstand at Rear, Independent Rear LED Light (Seat-Post Mounted), Optional Battery Upgrades (14ah, 17ah, 20ah), Optional Magura 4-Piston Hydraulic Disc Brakes Upgrade, Optional RST Guide Suspension Fork Upgrade


Locking Removable Downtube Semi-Integrated Battery Pack, 1lb 3 Amp Charger

Electronic Details

Motor Brand:


Motor Type:

Mid-Mounted Geared Motor
Learn more about Ebike motors

Motor Nominal Output:

750 watts

Motor Peak Output:

1000 watts

Motor Torque:

160 Newton meters

Battery Brand:


Battery Voltage:

48 volts (Optional 52v)

Battery Amp Hours:

14.5 ah (Optional 10ah or 21ah)

Battery Watt Hours:

696 wh (Optional 480wh or 1008wh)

Battery Chemistry:


Charge Time:

3 hours

Estimated Min Range:

9 miles (14 km)

Estimated Max Range:

30 miles (48 km)

Display Type:

Bafang DP C18.UART, Fixed LCD, Backlit, Adjustable Brightness (Double Tap Info Button, + and - and Info Buttons to Navigate, Hold + to Toggle Between Sport Mode and Eco Mode, Hold - to Enter Walk Mode, Hold Light Icon to Toggle Headlight and Backlight)


Battery Indicator (Percentage), Clock, Speed, Max Speed, Average Speed, Odometer, Tripometer, Range, Calories, Trip Timer, Pedal Assist (0-5) (Advanced Settings: Unit of Measurement, Brightness, Auto Off, Default Mode, Power View, SOC View, Trip Reset, Wheel Size, Speed Limit, AL Sensitivity, Password, Set Clock)

Display Accessories:

Independent Button Pad on Left

Drive Mode:

Advanced Pedal Assist (Measures Rear Wheel Speed and Pedal Cadence)

Top Speed:

28 mph (45 kph)(20 MPH Throttle Only, Optional 33+ MPH in Off-Road Mode)

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Written Review

To run the forums, host the website, and travel, I charge a universal service fee for my reviews. This review was sponsored by Biktrix. My goal is to be transparent and unbiased, this video and written review are not meant to be an endorsement of Biktrix products.

Biktrix has gone full speed ahead for 2019 and with that full speed comes full suspension. What I am talking about today is the Juggernaut Ultra FS. It features full suspension, power battery, mid-drive motor from Bafang with a 1000watt nominally rated setup. Yep, that’s 1000 nominal, so it is capable of getting up to a massive 1350watts in power. Before we get into that, lets go over some of the features here. As stated before, it is full suspension and that is one of the areas of comfort. The front fork is a RockShox Bluto fat-tire specific fork while the rear suspension features 100mm of travel and some preload adjust. There are some other adjustments that can be made here, but it must be noted it is kind of tucked away into the suspension as shown in the video, so do be aware of that. The headtube is tapered, so you could even swap out for another fork in the front if you wanted. Another point of comfort here are these Kenda Juggernaut fat tires. These are 26” x 4” and have some great nobby tread that actually can help as little dampeners adding a bit of absorption, so overall, very comfortable for riding. The rims here are pushed out to save weight which is nice and they sport some super sturdy 13 gage spokes in the both the front and rear. Assisting even further in comfort is this slopped top tube for easy approachability as well as this Velo plush saddle. It’s so great that Biktrix is putting so much comfort on a ride that is also very capable and fast… really just a lot of reassurance from something so powerful. I am told that the final production version comes with battery integrated lights which is nice, but the one I tested today had no front light and just a AAA battery operated flashing attachable light in the rear. Other features include locking flat grips, aluminum alloy Wellgo pedals, and wide 120mm hub spacing with 12mm through axles.

Driving the Juggernaut Ultra FS to its top speed of 28mph is the Bafang Ultra geared mid-drive motor. This motor offers 1,000 watts of nominal power with up to 1,350 watts of peak power! But even more impressive is it’s 160 newton meters of torque. Yes… 160 Nm. It’s the torquiest motor I’ve personally tested and seems to fit the bike quite well. Compared to most Class 1 ebikes which offer 50 to 90 Nm, the 160 here can feel exciting but might also put increased strain on the drivetrain and frame. Powering up moderate hills was a breeze (literally) and for all but the most extreme hills, I was able to rely solely on the throttle without pedaling at all. When tackling real hill climbs – ones where I actually had to get out of the saddle – I found the torque made the difference between me having to get off and walk up. One of the coolest things about this particular motor is that it’s Bafang newest version, which replaces some of the lower power designs that used nylon gears inside, this one uses all steel components. This upgrade in internal parts should help the motor handle the extreme torque being produced and improve its overall longevity. Now, I mentioned the top pedal-assist speed is around 28mph, because technically the motor will continue providing pedal assist up to 36mph. I think it’s great that in addition to the guard plate, there is a guide accessory at the top to keep the chain from bouncing around and coming off at high speed as well as a narrow wide tooth pattern that locks onto the chain more securely. The torque sensor did a nice job of smoothly administering power equal to my output. So when I pushed lightly on the pedals, I got a little bit of assist; when I hammered down on them the motor unleashed all its power. The motor cutoff was also pretty quick, and cut power almost immediately after I stopped applying pressure on the pedals. I appreciate this aspect, especially with the high torque of the motor, as I’ve found that on some cadence sensor designs found on cheaper ebikes, the motor cutoff lags quite a bit, making navigating trails at slow speeds difficult and even a bit unstable and unpredictable. Mechanically, you get a nice SRAM NX 11-42tooth (which is a great range for climbing) cassette, and a 42 tooth chain ring up front. Stopping the Juggernaut is a set of great 180mm hydraulic disc brakes in both the front and rear.

Powering the bike is a 48v 14ah lithium ion battery pack. I would definitely consider this a high capacity battery pack and really necessary for that super powerful motor. But in case you wanted more juice, Biktrix offers battery upgrades on the bike to both a 17ah and a whopping 21ah, very cool! Anyway, the battery is mounted via lock and key, however, you don’t need the key to start the bike, it is just for battery security. The battery has a power button and I love the LED display read out on it so you can check to see round about how much juice is left. To really care for this and other lithium-ion packs, I have heard that storing in a cool dry location vs. extreme heat or cold will extend the life and try to keep it about 50% full when not using for long periods so you won’t stress the cells. Try not to let it run down to zero, because that’s really hard on the cell chemistry.

Another area worth mentioning here is the control center. I’m kind of a control center geek and I always love to see comprehensive stats while riding. The Bafang control center on the Juggernaut does just that. It displays pretty much everything, including current speed, top speed, average speed, range, battery level, pedal assist mode, wattage output and more. More importantly, I could read it in direct sunlight! The only downside to this display was that it’s not removable, so I might worry about it getting dinged up when the bike is being parked or transported and just taking more sun and rain damage over time. On the plus side though, it does have the ability to enable a passcode, adding another layer of security to the bike which is a bigger deal if you have kids around or are just concerned about safety. It does however angle, and I love that the controls can be pressed easily by your left hand since they are positioned well as to keep your eyes on the road.

When it is all said and done, I found the Juggernaut to be a ton of fun. The suspension and fat tires really give it a rugged quality that can handle anything, and the powerful motor is… really something that can leave you speechless! However, there are some tradeoffs here so I did want to call those out. The bike was really comfortable, but I did feel the icing on the cake would be to add a suspension seat post. It doesn’t come with one, but that can be fixed by stopping by your bike shop and having one installed. This setup didn’t come with rack, headlight, or fenders, but I am told the final version should have an integrated headlight, so that should help. And finally, the pricing can be a bit confusing. During the filming of this review, I found it hard to nail down an MSRP on the bike. However, I soon understood the reasoning behind this… Biktrix is a direct to consumer brand, and you can literally build your bike on their website! So while this may seem like a con, it is actually a bit more of a pro since you have flexibility in options and choices. This one I tested came in around $4058.99, but I am told they can range anywhere from $3,399-$6,198 respectively. The bike is really a blast and well put together, I would like to thank Biktrix for inviting me up to come check it out.

As always, I welcome questions and feedback in the comment section below. Whether you own a previous version of the bike, have taken a test ride, or are brand new to the space, my goal is to provide an objective and honest resource. You can also join the Biktrix Ebike forums and share your own photos, videos, and review updates to help others! Have fun out there, and ride safe :)


  •  Incredibly powerful and torquey Bafang Ultra motor with 1000 watt nominal output and 160 newton meters of torque makes climbing even the steepest hills possible, it also drives the bike to speeds of almost 40mph
  • Sram trigger shifters and derailleur are specifically designed for e-bikes and should be able to handle the power and torque coming out of the motor, they also shift incredibly smoothly and have built in shift sensors to cut power to the motor when shifting, preventing the components from enduring unnecessary strain
  • Massive 180mm hydraulic disc brakes provide ample stopping power, which is extremely important for an electric bike like this that can reach speeds close to 40 mph
  • Locking grips should ensure the grips stay in place even when tackling the most extreme trails,
    a nice little feature that in my opinion falls under the category of safety
  • Motor inhibitors cut power to the motor whenever the brakes are the levers are depressed, ensuring the rider isn’t fighting agains the motor when trying to stop, another great safety feature
  • Control center is easily visible even in direct sunlight and offers a plethora of information including current speed, max speed, average speed, battery level, range, pedal assist mode, wattage output and more
  • Rock Shox Bluto front suspension does a great job of soaking up hard hits and making for an overall pretty smooth ride, the rear suspension with 100mm of travel is great too
  • I love that the electric controls are reachable from your left hand without having to take your hand off the handlebars, it really keeps your eyes on the road
  • Wellgo aluminum alloy platform pedals are extra wide and grippy and help keep my feet in place even when hitting extra bumpy terrain
  • Torque sensor starts and stops power very quickly and accurately, matching the power output against my own, this is great for trying to ride slowly over tricky terrain
  • Battery has above average capacity of 14ah, and Biktrix also offer a 21ah battery, battery is locking and removable and even has a LED charge level readout
  • Gearing is good for high speed thanks to the 11-42 teeth cassette in the rear and 42 teeth chainring up front


  • The one I tested had no headlight, but I am told they will ship with one, so it might be something you want to double check when purchasing
  • Suspension adjustment is difficult in the rear, one of the areas you can configure is mounted under the spring in a very difficult to get to place
  • I did like the full suspension, but I did wish that it had a suspension seat post, it would really round off the comfort well
  • No fender bosses in the front so the only way to mount a fender is to find one that compression fits inside the stem
  • Control center can’t be removed, leaving it vulnerable to theft and scratching when the bike is left at a public bike rack
  • Only one frame size may limit the range of rider heights the bike can accommodate
  • At $3,399 for the standard version and all the way up to $6,198 for the top configuration, the Juggernaut is definitely an expensive electric bike and might not offer the utility of around town commuting because of it’s unclassified power and performance


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