Biktrix Juggernaut Ultra FS Review

2020 Biktrix Juggernaut Ultra Fs Electric Bike Review
2020 Biktrix Juggernaut Ultra Fs
2020 Biktrix Juggernaut Ultra Fs Upgraded Reention Dorado Battery Pack Large Size Asymmetrical
2020 Biktrix Juggernaut Ultra Fs 48 Or 52 Volt Downtube Semi Integrated Reention Battery Options
2020 Biktrix Juggernaut Ultra Fs Flat Handlebar Grips Display Trigger Throttle
2020 Biktrix Juggernaut Ultra Fs Color Lcd Display With Haptic Feedback And Variable Speed Trigger Throttle
2020 Biktrix Juggernaut Ultra Fs Stock Suspension Fork Inverted 100mm Travel Fat Tire
2020 Biktrix Juggernaut Ultra Fs Integrated Spanninga Kendo Plus Headlight 150 Lumens
2020 Biktrix Juggernaut Ultra Fs Tektro Dorado Hd E500 Hydraulic Disc Brakes 180mm Rotors
2020 Biktrix Juggernaut Ultra Fs Rockshox Deluxe Air Suspension 130mm Travel Rear
2020 Biktrix Juggernaut Ultra Fs Bafang M620 Ebike Motor Alloy Casing Heat Fins Bottom
2020 Biktrix Juggernaut Ultra Fs Bafang M620 Ultra Multi Sensor Mid Drive Motor
2020 Biktrix Juggernaut Ultra Fs 11 Speed Sram Nx 11 42 Tooth
2020 Biktrix Juggernaut Ultra Fs Optional Bolt On Kickstand And Rear Wheel Punched Out Double Wall Rims
2020 Biktrix Juggernaut Ultra Fs Extra Large 48v 21ah Battery Pack
2020 Biktrix Juggernaut Ultra Fs 48v 4 Amp Fast Battery Charger
2020 Biktrix Juggernaut Ultra Fs Fast Battery Charger Details
2020 Biktrix Juggernaut Ultra Fs Ebike
2020 Biktrix Juggernaut Ultra Fs Stock High Step Black
2020 Biktrix Juggernaut Ultra Fs Electric Bike Review
2020 Biktrix Juggernaut Ultra Fs
2020 Biktrix Juggernaut Ultra Fs Upgraded Reention Dorado Battery Pack Large Size Asymmetrical
2020 Biktrix Juggernaut Ultra Fs 48 Or 52 Volt Downtube Semi Integrated Reention Battery Options
2020 Biktrix Juggernaut Ultra Fs Flat Handlebar Grips Display Trigger Throttle
2020 Biktrix Juggernaut Ultra Fs Color Lcd Display With Haptic Feedback And Variable Speed Trigger Throttle
2020 Biktrix Juggernaut Ultra Fs Stock Suspension Fork Inverted 100mm Travel Fat Tire
2020 Biktrix Juggernaut Ultra Fs Integrated Spanninga Kendo Plus Headlight 150 Lumens
2020 Biktrix Juggernaut Ultra Fs Tektro Dorado Hd E500 Hydraulic Disc Brakes 180mm Rotors
2020 Biktrix Juggernaut Ultra Fs Rockshox Deluxe Air Suspension 130mm Travel Rear
2020 Biktrix Juggernaut Ultra Fs Bafang M620 Ebike Motor Alloy Casing Heat Fins Bottom
2020 Biktrix Juggernaut Ultra Fs Bafang M620 Ultra Multi Sensor Mid Drive Motor
2020 Biktrix Juggernaut Ultra Fs 11 Speed Sram Nx 11 42 Tooth
2020 Biktrix Juggernaut Ultra Fs Optional Bolt On Kickstand And Rear Wheel Punched Out Double Wall Rims
2020 Biktrix Juggernaut Ultra Fs Extra Large 48v 21ah Battery Pack
2020 Biktrix Juggernaut Ultra Fs 48v 4 Amp Fast Battery Charger
2020 Biktrix Juggernaut Ultra Fs Fast Battery Charger Details
2020 Biktrix Juggernaut Ultra Fs Ebike
2020 Biktrix Juggernaut Ultra Fs Stock High Step Black

Summary

  • A high performance full suspension electric bike with fat, plus sized, or city slick tire options. Updated frame delivers slack head tube for high speed stability and bigger hits, shorter chain stay for improved stiffness and snap, and increased ground clearance.
  • Multiple battery size options allow you to optimize for weight savings or long range usage. Biktrix provides fast chargers and the battery has a USB charging port for portable electronics. Reflective tire graphics, reflective paint accents, and front and rear light keep you visible and safe in town.
  • The fat tire option is tubeless ready, provides puncture protection, and is capable in soft sand, marsh, and packed snow. The multi-sensor motor controller (with torque sensing), and trigger throttle make the bike easier to start and handle in soft terrain. It climbs very well, the brakes have motor inhibitors, and it offers physical shift detection to protect the drivetrain!
  • Acceptable 180mm dual piston hydraulic disc brakes can be upgraded to quad piston for better stopping power and cooling. The bike is very heavy at 70+ pounds depending on tire and battery choice. The rear swing arm may bend under high power from the motor (which offers 160nm of torque), which results in disc brake rotor zing and some phantom shifting in high gears.
Warning, in some configurations this electric bike is unclassified and may not be ridden on cycling trails or paths. It may require licensing, insurance, and additional lights to be licensed as a moped, for use on public roads.

Video Review

Introduction

Make:

Biktrix

Model:

Juggernaut Ultra FS

Price:

$3,499 ($4,699 CAD)

Body Position:

Forward

Suggested Use:

Trail, Mountain, Sand and Snow

Electric Bike Class:

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

Warranty:

1 Year Comprehensive, Lifetime Frame

Availability:

United States, Canada

Model Year:

2020

Bicycle Details

Total Weight:

72.8 lbs (33.02 kg)

Battery Weight:

9 lbs (4.08 kg) (10.5lbs for 17.4Ah and 21.0Ah Batteries)

Motor Weight:

11.7 lbs (5.3 kg)

Frame Material:

6061 Aluminum Alloy, Hydroformed

Frame Sizes:

17 in (43.18 cm)19 in (48.26 cm)

Geometry Measurements:

17" Seat Tube, 24" Reach, 29.75" Stand Over Height, 33.5" Minimum Saddle Height, 41" Maximum Saddle Height, 32.25" Width, 51.75" Wheelbase, 82" Length

Frame Types:

High-Step

Frame Colors:

Satin Black with Red and White Accents, Brushed Aluminum with Black Accents

Frame Fork Details:

Biktrix Inverted Air Suspension, 100mm Travel, Compression Adjust, Rebound Adjust, 35mm Black or Gold Anodized Stanchions, Magnesium Uppers, 150mm Hub Spacing, 15mm Thru-Axle with 5mm Hex Bolt, Optional DNM USD-6 Inverted Air Fork 110mm Travel (Lighter), Optional WREN Inverted Air Fork 150mm Travel (Lighter, Adjustable Travel, Better Performance)

Frame Rear Details:

RockShox Deluxe or Monarch Air Suspension, 100mm or 130mm Travel, Compression Adjust, Rebound Adjust, 197mm Hub Spacing, 12mm Thru Axle with 6mm Hex Bolt

Attachment Points:

Optional Custom Rear Rack (Clamp-Mounts to Seat Stays)

Gearing Details:

11 Speed 1x11 SRAM NX Mid Cage Derailleur with Roller Clutch, SRAM NX 11-42 Tooth Cassette

Shifter Details:

SRAM NX1 Trigger Shifter on Right (One-Way High, Four-Shift Low)

Cranks:

Bafang Branded Lasco EB11, Forged Aluminum Alloy, 170mm Length, 40 Tooth Narrow-Wide Steel Chainring with Bash Guard Aluminum Alloy Guide

Pedals:

Wellgo K79 Platform Aluminum Alloy with Fixed Pins

Headset:

Integrated, Sealed Cartridge, Tapered 1-1/8" to 1-1/2" (44mm to 56mm Outer Diameter)

Stem:

Biktric Branded Promax, Aluminum Alloy, 90mm Length, 6° Rise, Two 10mm Spacers, One 5mm Spacer

Handlebar:

Biktrix Branded Promax, Aluminum Alloy, 5° Rise, 5° Backsweep, 820mm Width

Brake Details:

Tektro Dorado HD-E500 Hydraulic Disc with 180mm Rotors, Dual-Piston Calipers, Tektro HD-E500 Three-Finger Adjustable Levers with Motor Inhibitors and Shift Detection, Optional Magura MT5E Quad Piston Brakes with Motor Inhibitors and Shift Detection

Grips:

Flat, Rubber, Non-Locking, Optional Ergonomic Locking

Saddle:

Velo Plush, Black with Reflective Patch Center Back

Seat Post:

Biktrix Branded Rigid Aluminium Alloy (Single Bolt Forged Clamp), Optional Suspension Post Upgrade

Seat Post Length:

350 mm

Seat Post Diameter:

31.6 mm

Rims:

Aluminum Alloy, Double Wall, Punched Out, 80mm Outer Width, 36 Hole

Spokes:

Stainless Steel, 13 Gauge, Black with Brass Nipples

Tire Brand:

Kenda Juggernaut Pro, 26” x 4.0” (98-559), Optional Kenda Havoc 27.5" x 3.0", Optional Schwalbe Super Moto-X 27.5" x 2.8"

Wheel Sizes:

26 in (66.04cm)

Tire Details:

Kenda Juggernaut Details: 5 to 30 PSI, 0.4 to 2.1 BAR, Reflective Branding, 120 Threads Per Inch (TPI) Casing, Dual Tread Compound (DTC), Tubeless Race (Tubeless Ready)

Tube Details:

Schrader Valve

Accessories:

Integrated Spanninga Kendo+ Front Light (150 Lumen), Independent D-LIGHT Rear LED Light (Seat-Post Mounted, 2 AAA Batteries, 3 Modes: Solid, Flashing, Rapid Flashing), Optional In-House Armageddon Headlight (2,000 Lumen), Optional Wheel and Tire Upgrades, Optional Battery Voltage and Capacity Upgrades, Optional Brake Upgrades, Optional Suspension Seatpost Upgrade

Other:

Locking Removable Downtube Semi-Integrated Battery Pack (Reention Dorado), 1lb 3 Amp Charger (Optional 1.4lb 54.6 Volt 4 Amp Charger with Larger Batteries), 30 Amp Motor Controller

Electronic Details

Motor Brand:

Bafang M620 Ultra

Motor Type:

Mid-Mounted Geared Motor
Learn more about Ebike motors

Motor Nominal Output:

1000 watts

Motor Peak Output:

1500 watts

Motor Torque:

160 Newton meters

Battery Brand:

Panasonic or Samsung, 18650 Cells, 2,900mAh or 3,500mAh

Battery Voltage:

48 volts (Optional 52 Volt)

Battery Amp Hours:

14.5 ah (Optional 17.5Ah or 21Ah)

Battery Watt Hours:

696 wh (Optional 840Wh, 910Wh, or 1,008Wh)

Battery Chemistry:

Lithium-ion

Charge Time:

4.5 hours

Estimated Min Range:

20 miles (32 km)

Estimated Max Range:

70 miles (113 km)

Display Type:

Fixed, Adjustable Angle, Color Backlit 2.25" LCD, Haptic Feedback, Buttons: +, -, M, Power, Lights: Hold +, Walk Mode: Hold -, Clear Readouts: Hold + and -, Settings: Hold M

Readouts:

Motor Output (10 Bars and Watts Number), Battery Charge Level (5 Bars and Percentage Number), Current Speed (Kilometers or Miles), Trip Distance, Trip Time, Odometer, Avg Speed, Max Speed, Assist Level (0-9), Lights Indicator, Motor Inhibitor Indicator

Display Accessories:

4 LED Charge Level Indicator on Battery, USB Charging Port on Battery (5 Volt 500 Milliamp)

Drive Mode:

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

Top Speed:

20 mph (32 kph)(Optional 35mph in Off-Road Mode)


Written Review

This review was provided for free, but Biktrix did organize delivery of a temporary demo bike and accessories to test. My goal is to be transparent and unbiased with you, this video and writeup are not meant to be an endorsement of Biktrix products. I welcome your corrections, additions, and feedback in the comments below, and the Biktrix forums.

Observations:

  • Biktrix started way back in 2013, launching their first product through a crowdfunding campaign in 2014. They are unique and remain relevant today because they offer so many choices for each model without raising the price significantly. That can be seen here, with the Juggernaut Ultra FS with the upgrade paths for suspension fork, battery capacity, and brake quality. They also offer three wheel size / tire options ranging from 4″ fat, plus sized knobby for trail riding, and high volume road tires.
  • The Biktrix Juggernaut Ultra FS was overhauled for 2020 / 2012 with an entirely new frame geometry. We reviewed the 2019 version a while back, and I was excited to see this new model because there are very few full suspension fat tire ebikes in existence today. This one has a powerful multi-sensing mid-drive with physical shift detection! That makes it powerful, well balanced, and fairly durable. The biggest downside I saw was that the power of the motor sometimes flexed the rear swing arm, causing the gears to “phantom shift” and cause crunching / mashing. This is especially true for heavier riders or when operating at full power and ascending.

Pros:

  • It’s amazing to see an ebike with this much power and so many customization options for such a low price. It’s incredible to me that such a niche offering is being produced in two frame sizes and two color schemes as well! The bike isn’t perfect, but it is definitely special in a lot of ways.
  • Great motor choice, given the heavier weight of the bike and possibility of larger tires (like the 26″ x 4″ on my demo model) the Bafang Ultra M620 was a good choice. It delivers an incredible 160nm of torque and the motor controller listens for rear wheel speed, pedal cadence, and pedal torque.
  • I was told that many customers actually use the Juggernaut Ultra FS for commuting, and I can see how this would be fast, powerful, and comfortable on many terrain types… even off road. For those who are riding near traffic, I love that the bike comes with tires that have reflective stripes and puncture protection. I also appreciate the integrated headlight (mounted high up and pointing where you steer) as well as the battery powered rear light with multiple flashing modes. To be clear, I think the fat Kenda Juggernaut Pro tires and Schwalbe Super Moto-X slick tires are reflective, but maybe not the Kenda Havok tires (which are more for cross country / trail riding).
  • Commuters will appreciate the optional rear rack and fenders that Biktrix offers for this model. Having something you know will fit the wider dropout and larger tire sizes is nice. The only downside is that the rear rack and fender mounts to the seat stays and are therefor sprung vs. unsprung weight. Your gear could get bounced around more in this position vs. wearing a backpack or using a seatpost mounted arm style platform rack. The downside of those is that they can get bumped side to side easily and don’t support as much weight.
  • For this review, I was riding the 17″ small-medium frame size in black. Biktrix also produces a 19″ medium-large and both can be had in black or brushed aluminum alloy. Coming back to safety, the brushed alloy will probably offer an improved visual footprint and just be brighter for cars to see, but even the black has some nice white accents.
  • The 11-speed drivetrain is pretty great. It uses a SRAM NX derailleur and offers an 11 to 42 tooth spread for comfortable pedal cadence options when climbing or riding at high speeds. This bike can go up to 35mph when unlocked, after all. The steel chainring uses a narrow-wide tooth patter than really grabs the chain, and also has a thick aluminum alloy guide that doubles as a bash guard for off-road use.
  • One of my favorite parts of this bike is the physical shift detection setup. This significantly reduces wear on the chain, derailleur, and rear sprockets. It’s a must-have for such a powerful motor, but wasn’t completely necessary given the multi-sensor torque sensing motor controller. Biktrix used the part and also added motor inhibitors to both brake levers. Great job here!
  • The motor itself is very powerful, but not super loud. The motor controller measures rear wheel speed, pedal cadence, and pedal torque. Aside from being a fairly heavy and large motor, I love everything about it! It offers 110 RPM pedal support and up to 160 newton meters of torque… which is incredible. Most ebikes I test only offer 80nm or possibly 90nm. Thankfully though, it’s the kind motor and controller setup that lets you go slowly and gently even in the highest assist level if you aren’t applying a lot of pedal pressure, it’s great for more technical riding, or doing wheelies ;)
  • Given the power and weight of this bike, combined with the heavier wheel and tire options (4″ fat tires), I love that they chose an inverted suspension fork with sturdy 15mm thru-axle! Inverted suspension is stiffer than traditional, and the stock suspension fork offers compression adjust, rebound adjust, air pressure settings, and it has lower stanchion protectors with black anodized stanchions. It’s pretty sweet, and not something I’m used to seeing outside of downhill bikes. The stock suspension and first level upgrade offer 100mm of travel, but the highest level WREN upgrade offers 130mm of travel. As cool as it all is, the rake is a bit relaxed for me, and the longer travel WREN could change the frame geometry. I feel like this is a half downhill half cross country hybrid that is a bit awkward at times.
  • If you do choose the tire, suspension, brake, or battery upgrades, Biktrix will install them all for you. This isn’t the kind of ebike where you get it in multiple parts and have to do a lot of work to get going. Just attach the front wheel, turn the handlebar, put on the pedals, and maybe do a once-over inspection to make sure everything else is secure and shifting properly.
  • One more thing about the tires, the fat Kenda Juggernaut Pro tires come tubeless ready (so you can convert to tubeless). This allows them to ride at lower pressure without the risk of pinch flats, and it also reduced the weight of the tires which reduces the overall weigh the bike but also reduces the work that the suspension has to do by lowering unsprung weight.
  • Biktrix designed their own fender, and identified a third party option, that will work on this bike, even with the optional rear rack. Biktrix sells the custom front “Armadillo” fender for $80 and rear “Mudhugger” fender for $40, which can be seen in the video at 9:39.
  • I like that the Reention Dorado battery packs all have a full sized USB Type A charging port on the top right hand side. This could be useful for charging a phone while riding (just don’t snag the cable), or as a power bank if you go bikepacking and need to run a small light in your tent.
  • Having a removable battery and 3.5 or 4 amp fast charger is great, because it lets you protect the battery cells from extreme heat or cold, and spend less time in between rides. Many comparable ebikes come with slower 2 amp chargers, but Biktrix starts with 3.5 amp and then upgrades to 4 amp for free along with their larger battery packs.
  • The stock display is pretty nice, it’s large and produces some haptic buzzing feedback when buttons are pressed. I was told that Biktrix also has an optional replacement called the Bafang 500C for those who prefer a different menu system. I was fine with the stock display, which is shown in the pictures and videos above.
  • I love that Biktrix offers shorter 152mm crank arms for this bike, because it allows people who want to pedal through turns to do so without creating pedal strike. It’s a unique offering that I rarely hear mentioned, and it speaks to the different type of riding and advanced torque sensing drive system on offer here. I was told that compared to the prior 2019 model year frame, the latest version has 1″ increased ground clearance as well.
  • Other upgrades for this new model include new bushings, new suspension geometry, shorter chainstay (for stiffness and quicker turning), slacker head tube angle to increase stability at high speeds (they say it’s more planted)
  • I was told that the company can sell multiple wheelsets with each bike, so you could have your on-road and off-road, your snow ready fat tires and trail ready plus sized tires… that’s kind of neat.
  • Other minor positives include the extra wide and sturdy Wellgo alloy platform pedals, durable and smooth SRAM trigger shifter design (both high and low gear levers use right thumb vs. your index finger which should be on the brake lever), and an overall great weight distribution (low and center for improved stability and handling).

Cons:

  • The biggest downside to this setup that I and my friends noticed after taking multiple test rides is that the powerful mid-drive motor pulls so hard on the drivetrain, that it flexes the rear swing arm a bit and can cause phantom gear shifting if you’re in the highest gears. This can damage the chain and rear sprockets, you can hear them crunching during parts of my ride test when I climb a very steep hill at 30:47. You can reduce this by accelerating more gradually or using the lowest gear (or gears that are more inline with the chainring). The phantom shifting may be more pronounced for heavy riders, those operating in the highest level of assist, and those climbing steep hills.
  • For me personally, the steer tube angle is too relaxed. It makes steering at low speed feel twitchy and reminds me of a downhill bike, which does not seem like the primary application of this ebike. I would prefer a slightly steeper head tube angle with less relaxed rake… something in between the first model and this newer model. The people at Biktrix told me that it helps improve stability at high speed, which I see as true to an extent… but it also requires the need for oversteer if you opt for the big heavy tires, and made the bike much longer which can take up a lot of space and be difficult to maneuver through doors.
  • Depending on how you plan to transport this ebike, it’s so long that it might not fit in your car rack. I have a Küat Sherpa rack and it did not accommodate this ebike. The wheelbase is 51.75″ and the fat tires add extra thickness and length.
  • In addition to being long, the bike is very heavy compared to most others that I review. This is especially true with the fat tire option. The bike I received had the battery pack upgrade, which adds some weight, and I measured it at 72lbs total. Thankfully, the 9lb or 10.5lb battery pack can be removed to make the bike easier to lift, and I would also recommend transporting it without the battery so as not to stress bike racks.
  • Depending on how this bike is setup, it may be illegal on bike paths and trails where you live. The motor is rated at 1,000+ watts, which surpasses the 750 watt US and 500 watt Canadian Class 1, 2, and 3 restrictions. For this reason, it may be best suited to off-road use or on private property. I had mine shipped to comply with local regulations, and it still felt very powerful. Note that it does not have the proper DOT rating or lights (with turn signals) to be licensed as a moped without modification.
  • The Biktrix Juggernaut Ultra FS base model increased in price by $100 compared to the prior generation. I think the upgrades and inflation make this understandable, but I feel that the new super relaxed head tube angle is a drawback compared to the original design.
  • The stock brakes are the bare minimum for what I would consider safe given the weight and power of this ebike. Thankfully, Biktrix does offer an upgrade to quad piston calipers. I’d love to see a thick 203mm rotor as well, but then it may zing as the rear swing arm flexes under motor power or heavy braking.
  • This is a very minor complaint, more of an awareness point to be shared, but the extra large battery pack upgrade for this bike is not symmetrical. It will bulge out to the left side of the frame which could compromise handling a bit and become prone to kicks and scratches.
  • The battery charging port is very low, positioned near the left crank arm. This makes it vulnerable to snags and bumps by the cranks, and difficult to see and reach when charging. It definitely helps to have a kickstand to balance the bike when plugging in and charging, and that will cost extra! I recommend the kickstand for urban and light cross country use so you don’t have to lean the bike over or risk having it tip as easily. For those taking on all-mountain or downhill conditions, the kickstand could bounce a lot more and crank arms could strike… so consider their shorter 152mm crank arms and then be careful when leaning the bike over and charging… ideally you’d lay the bike on the non-drivetrain side, but again, this is where the charging port is, so maybe just remove the battery pack to charge each time.
  • Other minor complaints include the display not being removable (you can swivel a bit to decrease glare), the lack of a derailleur guard for off-road riding and protection during shipping, and lack of any bottle cage mounts.

Useful Resources:

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Comments (2) YouTube Comments

Smorgasbord
3 weeks ago

Court, as I posted in the forum here, I think a close examination shows that it’s not that the rear swing arm is deforming, but that the pivot points for the rear suspension have some play in them. Take another look and let us know what you think.

  Reply
Court
3 weeks ago

Oh yeah, I agree with you. I saw the frame shots and see how the flexing appears to happen at the pivot points mostly, not the alloy tubing. I think that I just used the wrong words to describe it, or was generalizing… like saying “the swing arm” incorporating all of those parts together as a unit, not specifying where the play was happening exactly. Thanks for your input!

  Reply

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