Biktrix Juggernaut Ultra Eagle 2 Review: 160 Nm of Climbing Torque for $4,999
A serious backcountry machine built around Bafang's Ultra motor, with the power and battery to go far and rough if the $4,999 price fits.
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What the stars are rated against
The stars compare this bike with other off-road e-bikes we have scored — 41 of them, priced $1,500–$8,498. They are a ranking inside that group, not an absolute grade: four stars means it beats most of that set on the measure, not that it hits some fixed standard.
Peers are drawn from a tight price band around this bike, so a $1,000 commuter is judged against other $1,000 commuters rather than against machines costing three times as much. Change the group and the stars would change with it.
The headline Genius Score is not decided by that group alone. It blends the category ranking above with a market-wide view across every bike we publish, so a bike cannot climb simply by sitting in a weak category. How we score.
The Biktrix Juggernaut Ultra Eagle 2 is a bike you buy for climbing and for going where the pavement ends. At its heart is a making , and that number is the whole story: it's enough grunt to haul you and a loaded pack up a steep, loose fire road without the motor bogging down. That capability is what earns its Genius Score of 71 out of 100 with us. The price is high, but for a premium off-road buyer, power like this is exactly what you came for.
It's also flexible about how you ride. There's a , so you can pull away from a dead stop on a hill or cruise a stretch of trail without pedaling, and the is switchable between Class 2 and Class 3 in the settings. In plain terms, you can dial it down to a 20 mph limit for a shared trail or open it up to 28 mph on the road, all on one bike.
Pros & cons
What we like
- A Bafang Ultra with that pulls strong on steep, technical climbs where lesser motors give up
- 1,000W of and for hard trail work
- A large 910Wh as the default, with bigger packs offered for longer days
- A plus a switchable setup that lets one bike suit both shared trails and open road
- Quad-piston brakes on big 203mm rotors, which is real stopping hardware for a heavy, fast bike
Worth weighing
- Value is the soft spot at this price: you're paying for the specific Bafang Ultra motor, not for extra range or hardware that other off-road bikes match
- The base 27.5" x 3" tires are tuned for pavement and groomed trails, so deep, technical terrain wants one of the fatter tire options
Key specs
The motor & power
The Bafang Ultra M620 is the reason this bike exists. It's built to climb and haul weight on steep, loose terrain, which is exactly what you want for real off-road riding.
The headline is , and that's a big number. On a steep, loose climb with a loaded bike, that's what keeps you moving instead of grinding to a stall. It rates 1,000W of with , so judge it on the 1,000 you'll actually live with day to day; the peak is there for short, hard efforts like punching up a ledge.
There's also a , which on a bike this powerful is genuinely useful. It gets you rolling from a stop on a hill without having to muscle the pedals, and it takes the edge off technical sections where you'd rather steer than pedal. The catch is that leaning on the throttle pulls harder on the battery than pedaling does.
Range & battery
The default pack is a 910Wh , which is a lot of capacity, and it needs to be given how much power this motor can pull. Biktrix quotes up to 55 miles.
That 55-mile figure is a best case on gentle ground with modest assist. Real off-road days with big climbs, a loaded bike, and time on the throttle will pull it down noticeably, so plan your loop around a lower number and you won't get caught out.
Biktrix lists several battery sizes on the same bike. The 910Wh (52V 17Ah) pack is the default; if your rides run long or climb a lot, the larger 1,008Wh and 1,200Wh options buy you meaningful extra miles for the money, and they're worth a look before you check out.
Ride & components
This is a fast, heavy bike, so the brakes matter, and Biktrix specced accordingly: IIIPro E500 quad-piston on 203mm rotors. That's serious stopping power meant to haul you and a load down a hill under control, run after run.
Shifting is handled by a SRAM NX 11-speed drivetrain, a solid mid-tier setup that gives you a wide enough gear range to actually pedal alongside the motor on climbs and descents. The frame carries a 330 lb , so you've got plenty of headroom for a bigger rider plus gear or a hunting pack.
It rides on 27.5" x 3" tires in the base build, which Biktrix aims at pavement and groomed trails. If your riding is rougher and looser, the fatter 26" x 4" and 26" x 4.8" options give you more float and grip. At about 61 pounds it's also on the lighter side for a mid-drive off-road bike this powerful, which helps when you're manhandling it over obstacles.
The class is switchable in the display, so this is one bike, not two. In its setting the is active and tops out at 20 mph, which is usually what keeps you legal on shared bike paths and multi-use trails. Flip it to Class 3 and assist runs up to 28 mph, which is road and bike-lane territory. Set it low where the rules are tight and open it up where they aren't.
Price & value
At $4,999, this is a premium buy, and that's the honest sticking point. You're paying top dollar for that Bafang Ultra motor and the big battery, and the hardware is genuinely capable. The trouble is that value is a relative weak spot here: a handful of off-road rivals get you comparable range and power for less.
So the question isn't whether the bike is good, it's whether the specific motor is worth the stretch to you. If you want that 160 Nm mid-drive for steep, sustained climbing and you'll use it, the price makes sense. If you mostly want a capable trail bike and don't need this much motor, your money goes further elsewhere.
Who it's for
The serious climber
If your rides are all about long, steep, loose climbs, the and its are exactly what you're paying for. This bike keeps pulling where a weaker motor would stall, and the big battery gives you the range to chase a full day of elevation.
The one-bike, two-rulebooks rider
If you ride a mix of shared trails and open roads, the switchable setting lets you cap it at 20 mph where the rules are strict and open it to 28 mph where they aren't. The is a bonus for pulling away from stops on a hill without a pedal stroke.
The value-first trail rider
If you want a capable off-road e-bike but you're weighing every dollar, look hard before you buy. The premium here only pays off if you specifically want that Bafang Ultra motor and will lean on its climbing muscle; otherwise you're spending for a motor you won't use.
The flat-city commuter
If your riding is mostly errands and pavement with no real hills, this is far more motor and money than you need. A lighter, cheaper commuter with a smaller would do that job better and cost thousands less.
Frequently asked
Does the Biktrix Juggernaut Ultra Eagle 2 have a throttle?
Yes. It has a when set to Class 2, so you can ride without pedaling, which is handy for pulling away on a hill or easing through technical sections.
Can you ride the Biktrix Juggernaut Ultra Eagle 2 without pedaling?
You can, using the throttle in its Class 2 setting, up to 20 mph. Just know that riding on the throttle drains the 910Wh battery faster than pedaling with the motor's help.
Can you change the class on the Biktrix Juggernaut Ultra Eagle 2?
Yes, it's switchable in the display between . Class 2 keeps the throttle active and caps assist at 20 mph for shared trails; Class 3 raises assist to 28 mph for road and bike-lane use.
How far does the Biktrix Juggernaut Ultra Eagle 2 go on a charge?
Biktrix claims up to 55 miles on the default 910Wh battery. Hard off-road riding with big climbs and throttle use will bring that down, and larger 1,008Wh and 1,200Wh packs are offered for longer days.
How fast does the Biktrix Juggernaut Ultra Eagle 2 go?
Pedal assist runs up to 20 mph in its Class 2 setting and up to 28 mph in Class 3, depending on how you set it in the display.
What motor does the Biktrix Juggernaut Ultra Eagle 2 have?
A Bafang Ultra M620 rated at 1,000W continuous with 1,500W peak and 160 Nm of torque, which is why it climbs so strongly.
How much does the Biktrix Juggernaut Ultra Eagle 2 weigh?
About 61 pounds with the battery, which is fairly light for a mid-drive off-road bike this powerful.
How it compares to its siblings
At $4999 this is the most expensive bike in the lineup, and the extra money buys three concrete things the others don't have: SRAM NX 11-speed gearing, a Class 2/3 rating for higher pedal-assist speeds, and a huge weight cut to 60.6 lb versus 84.9-88.5 lb on every sibling. Payload drops to 330 lb though, below the 380 lb on the Duo Pro and Duo 4. If you need to carry or lift this bike often, that weight difference matters; if not, you're paying significantly more for the same 160Nm torque and comparable range as cheaper siblings.
Biktrix Juggernaut Ultra Duo Pro Step-Thru review Biktrix Juggernaut Ultra Duo 4 Step-Over review Biktrix Juggernaut Ultra FS Pro 3 Cruise review Biktrix Juggernaut Hub Duo Step-Over 2 review
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Biktrix Juggernaut Ultra Eagle 2 is ranked on:
Guides worth reading
- Mid-drive vs hub motorWhere the motor sits changes how the bike climbs, what it costs, and what wears out. Neither is better everywhere.
- E-bike classes explained: Class 1, 2 and 3Three classes, two questions: does it have a throttle, and how fast does the motor keep helping.
- Nominal vs peak watts on an e-bikeThe wattage in the headline is usually the peak figure, which can be roughly double the number the motor actually sustains.
How 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.