Biktrix Juggernaut Ultra FS Pro 3 Cruise Review: Serious Climbing Torque and a Throttle for $3,186
The Biktrix Juggernaut Ultra FS Pro 3 Cruise is a premium off-road e-bike built to grind up loose, steep terrain, with a throttle for when the climb gets ugly.
If your riding involves real climbing, loose dirt, and the kind of terrain that stalls a weaker bike, the Biktrix Juggernaut Ultra FS Pro 3 Cruise is built for exactly that. It runs a Bafang Ultra motor making , which is a lot of grunt for grinding up steep, rough climbs without bogging down. That capability, paired with a fair price for what you're getting, earns it a Genius Score of 87 out of 100.
You also get a , so this looks to be a bike you can ride without pedaling up to 20 mph, based on its listed limits. That helps on a hard climb or pulling away from a dead stop. The catch is that the same big motor uses up the quickly, so plan your range around how hard you ride rather than the 45-mile claim.
Pros & cons
What we like
- from the Bafang Ultra handles steep, loose climbs that make lesser motors quit
- A lets you ride without pedaling up to 20 mph, which is a real help on tough climbs and from a standstill
- with leaves you power to spare when the terrain gets rough
- Grown-up parts for the money: SRAM NX 11-speed, , and grippy Schwalbe Moto X tires
- At 71.9 lb it's on the lighter side for a full-power off-road build
Worth weighing
- Top speed is capped at 20 mph, so there's no faster assist mode for covering ground on pavement
- 265 lb of is fine for a rider and a small pack, but it's not a heavy hauler
Key specs
The motor & power
The heart of this bike is the Bafang Ultra M620, a that's the setup you want for climbing. It multiplies its with whatever gear you're in, so it keeps pulling up steep, loose ground where a hub motor would start to bog.
It's rated at with , and the continuous number is the one that matters for long, sustained climbs. In plain terms, this is one of the strongest motors you'll find on a trail e-bike, and it shows most when the trail turns sharply uphill.
There's a too, so you can move without pedaling at all, which is handy when a climb gets technical and you'd rather not fight the pedals. Output is held to 20 mph, and that limit is what points to a setup.
The motor hardware is a full 1000W Bafang Ultra, but this Cruise version appears to be configured for street-legal limits: the page lists a 20 mph and 500W cap plus an on-demand throttle, which is why we read it as Class 2. So you're getting a genuinely powerful motor held to legal limits. That's worth knowing if you're comparing it to uncapped versions of the same motor.
Range & battery
Power like this needs fuel, and here that's a 52V tucked inside the frame. Biktrix estimates up to 45 miles of , which is a reasonable figure for gentle riding on mostly flat ground.
Like any range number, that figure assumes ideal conditions, so realistically plan for less depending on terrain, load, and how much throttle you use, since the big motor draws more current on long, steep climbs. Carry a charger for longer outings.
You'll see the battery listed two ways: the spec sheet says 52V 17.5Ah (910Wh), while some feature text says 52V 17Ah (which works out to about 884Wh). It's a small difference, and we go with the 910Wh spec-sheet figure, so treat 45 miles as a best case either way.
Ride & components
The parts here are picked to survive rough terrain. The SRAM NX 11-speed drivetrain gives you a wide gear range, which pairs with the motor to keep you spinning up steep pitches instead of grinding to a halt.
Stopping is handled by Biktrix dual-piston on 180mm rotors, which is the kind of control you want hauling a heavy, powerful bike back down a descent. The 27.5 x 2.8 Schwalbe Moto X tires are fat and knobby enough to bite into loose dirt and gravel.
It's a full-suspension frame, and at 71.9 lb it's lighter than a lot of full-power off-road bikes, so getting it onto a rack or over an obstacle is less of a wrestling match than the spec suggests. Biktrix doesn't publish suspension travel numbers, so we can't tell you exactly how much it soaks up.
Price & value
At $3,186, this sits squarely in premium off-road territory, and the price buys you a top-tier motor, a large battery, and parts that hold up to hard use. That combination makes it an outstanding value for the money, which reflects a lot of real capability for what you're paying.
The way to think about it: you're paying for the Bafang Ultra's climbing power and a build that can take a beating. If steep, rough terrain is what you actually ride, the money lands well. If you mostly want range or road speed, you'd get more of that elsewhere.
Who it's for
The steep-trail climber
If your local rides throw long, loose, punishing climbs at you, this is where the Juggernaut shines. The 160 Nm mid-drive and wide-range gearing keep pulling up grades that would stall a weaker bike, and the throttle is there when a climb gets too technical to pedal cleanly.
The rider who likes a break from pedaling
If you want the option to twist a throttle and let the motor carry you, up a hill or away from a stop, this bike gives you that up to 20 mph. It also means the exercise is optional, which is a real difference from pedal-assist-only trail bikes.
The all-day distance rider
If you measure rides in 50-mile-plus backcountry days, check the range math before you buy. A motor this powerful pulls hard on the battery, and a full day of climbing on the throttle can leave you well short of a charge, so you'd want to plan stops or bring a spare battery.
The pavement speed seeker
If most of your miles are on roads and you want to cruise fast, the 20 mph cap will feel limiting. This bike puts its power into climbing and torque, not top speed, so a Class 3 commuter would serve a road-focused rider better.
Frequently asked
Does the Biktrix Juggernaut Ultra FS Pro 3 Cruise have a throttle?
Yes. It has an on-demand throttle, so you can ride without pedaling up to 20 mph. Based on that throttle and its 20 mph limit, it reads as a Class 2 bike.
Can you ride the Biktrix Juggernaut Ultra FS Pro 3 Cruise without pedaling?
Yes, the throttle lets you get moving and cruise without pedaling at all. It's especially useful on steep climbs and pulling away from a stop, though riding on the throttle drains the battery faster.
How far does the Biktrix Juggernaut Ultra FS Pro 3 Cruise go on a charge?
Biktrix estimates up to 45 miles from the 910Wh battery. That's a best case for gentle, flat riding; plan for less on steep climbs or heavy throttle use, since the big motor draws more power.
How fast does the Biktrix Juggernaut Ultra FS Pro 3 Cruise go?
Its motor output is capped at 20 mph on both pedal-assist and the throttle, which lines up with a Class 2 setup.
How much torque does the Biktrix Juggernaut Ultra FS Pro 3 Cruise have?
It makes 160 Nm of torque from a 1000W Bafang Ultra mid-drive motor, with up to 1500W of peak power. That's a lot of climbing muscle for steep, loose terrain.
How much does the Biktrix Juggernaut Ultra FS Pro 3 Cruise weigh?
It weighs 71.9 lb without the battery (measured on the medium 17-inch frame), which is on the lighter side for a full-power off-road e-bike.
What class is the Biktrix Juggernaut Ultra FS Pro 3 Cruise?
It appears to be set up as a Class 2 e-bike, based on its listed 20 mph and 500W limits plus the throttle. Class 2 rules affect where you're allowed to ride, so check your local trail and path regulations.
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Read the reviewHow we score: the Genius Score blends a bike's capability against same-price peers with its value for the money, weighted for what this off-road buyer prioritises. Specs are pulled from the manufacturer's live page and normalised (nominal vs peak watts, true weight with battery). Ratings are our estimate from specs, not a lab test.