The Mokwheel Onyx is a full-suspension, mid-drive fat-tire ebike built for riders who want serious torque, long range, and a big, stable frame that doesn’t flinch under load. With a 1300W peak mid-drive motor, 48V 19.6Ah battery, 26″ x 4.0″ fat tires, and 4-piston hydraulic brakes, it’s aimed squarely at taller, stronger riders who split time between pavement, gravel, and real off-road terrain.
Compared to hub-motor fat bikes, the Onyx leans into mid-drive efficiency and a more “mountain bike” feel, especially on climbs and technical sections.
As a Mokwheel partner, I earn commission from qualifying purchases.
👉 Check current pricing, colors, and accessory bundles for the Mokwheel Onyx here.
TL;DR – Mokwheel Onyx at a Glance
| Category | Details |
|---|---|
| Bike type | Full-suspension, mid-drive, fat-tire all-terrain ebike |
| Motor | Mid-drive: 750W rated, 1000W continuous, 1300W peak, 210Nm+ torque |
| Battery | 48V 19.6Ah (≈940Wh) battery that complies with UL standards |
| Claimed range | 60–80 miles per charge (PAS, ideal conditions) |
| Realistic range | Roughly 35–65 miles for most riders, depending on weight, terrain, and PAS level |
| Speed class | 20 mph (throttle) / 28 mph (PAS) |
| Weight & payload | 89 lb bike, up to 560 lb total payload |
| Tires | 26″ x 4.0″ puncture-resistant fat tires |
| Brakes | Tektro HD-E3940 4-piston hydraulic brakes |
| Fit | One size, recommended for riders 5’7″–6’9″ |
| Best for | Tall, power-oriented riders who want a long-range, mid-drive fat-tire machine for mixed terrain |
👉 See the latest Onyx specs and available colors on the Mokwheel site.
Key Specs: Mokwheel Onyx Technical Overview
Performance
| Spec | Onyx Details |
|---|---|
| Top speed (PAS) | Up to 28 mph |
| Top speed (throttle) | 20 mph (Speed Class: 20 mph throttle / 28 mph PAS) |
| Claimed range | 60–80 miles per charge (PAS) |
| Payload capacity | Up to 560 lb |
| Pedal assist levels | 1–5 PAS levels |
| Gearing | Shimano 10-speed drivetrain |
| Recommended rider height | 5’7″–6’9″ (one size) |
Power System
| Spec | Onyx Details |
|---|---|
| Motor type | Mid-drive motor |
| Rated power | 750W |
| Continuous power | 1000W |
| Peak power | 1300W |
| Torque | 210Nm+ |
| Battery | 48V 19.6Ah battery that complies with UL standards |
| Charger | 48V 3A |
| Sensor | Torque + cadence sensor |
| Throttle | Thumb throttle |
Frameset & Components
| Spec | Onyx Details |
|---|---|
| Frame | 6061 aluminum alloy with internal battery |
| Fork | 135 mm adjustable suspension |
| Rear shock | DNM 50 mm center shock (full suspension) |
| Tires | 26″ x 4.0″ puncture-resistant fat tires |
| Brakes | Tektro HD-E3940 4-piston hydraulic brakes |
| Display | HD stem-integrated display |
| Chain | KMC stainless chain |
| Crankset | 44T aluminum alloy |
| Handlebar | 31.8 mm aluminum alloy bar, 720 mm width |
| Kickstand | 6061 aluminum kickstand |
| Rims | Aluminum alloy |
| Saddle / seatpost | Saddle with hidden manually adjustable seatpost |
| Spokes | Heavy-duty carbon steel, 12G × 248 mm (front) / 251 mm (rear) |
| Bike weight | 89 lb |
Geometry (Reference Data)
The Onyx is unapologetically a big bike. Mokwheel’s fit chart calls out:
| Measurement | Value |
|---|---|
| Rider height (target) | 5’7″–6’9″ |
| Reach | 19″ |
| Top tube length | 25″ |
| Standover height | 31″ |
| Wheelbase | 50″ |
| Min saddle height | 35″ |
| Max saddle height | 41″ |
| Total length | 79″ |
| Head tube length | 6″ |
If you’re at the lower end of that height range, pay close attention to the 31″ standover and 35″ minimum saddle height before you commit.
👉 Review the official Onyx spec sheet and geometry details here.
Design & Frame: Big, Full-Suspension Fat-Tire Platform
The Onyx is built as a long-travel, mid-drive fat-tire platform rather than a compact city commuter:
- Full suspension: 135 mm front fork travel and a 50 mm rear air shock give you real bump absorption on rough terrain.
- Fat tires: 26″ x 4.0″ rubber adds grip and confidence on loose dirt, snow, sand, and chewed-up pavement.
- Integrated battery & clean lines: The 48V 19.6Ah battery tucks into the downtube, keeping the overall silhouette sleek for a bike this big.
- High payload: With a claimed 560 lb capacity, it’s built to carry bigger riders and/or serious cargo without feeling maxed out.
It reads more like an all-terrain SUV than a nimble city hatchback. If that’s what you’re after—wide stance, planted feel, plenty of travel—it’s right on target.
Motor & Power: 1300W Peak Mid-Drive With Torque + Cadence Sensing
Most affordable fat-tire ebikes rely on rear hub motors. The Onyx goes a different route with a mid-drive system that ties power into the drivetrain:
- 1300W peak power, 210Nm+ torque – Well beyond typical 750W hub systems, especially in sustained climbing and loaded scenarios.
- 750W rated / 1000W continuous – The motor is designed to run at real-world power levels without immediately overheating.
- Torque + cadence sensors – The controller blends how fast you’re pedaling with how hard you’re pushing, so power feels more “natural” and proportional than on simple cadence-only systems.
What it feels like on the trail or steep city climbs:
- The bike pulls hard uphill, especially when you downshift and let the motor work through the gears.
- Starts and stops are smooth rather than jerky, as the torque sensor ramps power with your effort.
- On flats and rolling terrain, PAS levels 2–3 are usually enough to cruise in the low-20s mph without drama.
For riders coming from hub-motor bikes, the mid-drive Onyx will feel more responsive and “connected,” especially if you actually use the 10-speed drivetrain instead of staying in one gear all ride.
Battery, Charging & Realistic Range
On paper, the Onyx’s 48V 19.6Ah pack is good for 60–80 miles of range per charge. That’s under ideal conditions: lower PAS levels, moderate speeds, and a lighter rider on mostly flat ground.
Realistically, here’s what most people can expect:
| Use Case | Typical Settings | Realistic Range* |
|---|---|---|
| Mixed urban/suburban, moderate hills | PAS 2–3, light cargo | ~45–65 miles |
| Heavier rider + hills + some off-road | PAS 3–4, frequent shifting | ~35–55 miles |
| Lots of full-power climbing / soft terrain | PAS 4–5, aggressive riding | ~30–45 miles |
| Throttle-heavy use | 20 mph throttle, minimal pedaling | Often under 40 miles |
*Actual range depends on rider weight, elevation gain, temperature, wind, and how hard you push the motor.
The 48V 3A charger makes full charges manageable for a large battery. Most owners will treat it as a “charge overnight, ride all day” setup, with optional mid-day top-offs if they’re doing long back-to-back outings.
Brakes, Tires & Safety
With an 89 lb chassis and real 28 mph capability, braking and control hardware matter just as much as the motor:
- Tektro HD-E3940 4-piston hydraulic brakes provide serious stopping power and better heat management on long descents than basic 2-piston setups.
- 26″ x 4.0″ puncture-resistant tires give you a massive contact patch and extra forgiveness on rocks, roots, and loose surfaces.
- High payload rating (560 lb) means the frame, wheels, and spokes are built with heavier use in mind.
The fat tires and suspension make the bike forgiving when you’re pushing into rougher sections, but they don’t eliminate the need for good technique. At the speeds this bike can reach, a full-coverage helmet, gloves, and a conservative learning curve are smart choices—especially if you’re new to mid-drive power.
Ride Comfort, Handling & Fit
The Onyx is tuned for taller riders who want an upright, planted feel:
- Rider height window: Mokwheel positions it for riders 5’7″–6’9″, which is wider than many one-size bikes—but clearly skewed toward the taller end of the spectrum.
- 31″ standover and 35″ minimum saddle height mean shorter riders or those with shorter inseams may find the bike a stretch.
- 19″ reach and 50″ wheelbase contribute to a stable, long-wheelbase feel that’s reassuring at speed and in rough sections.
Comfort highlights:
- The dual-crown-style front fork and rear air shock soak up chatter, potholes, and roots far better than a hardtail fat bike.
- Fat tires at reasonable pressures (often in the mid-teens psi off-road) act like an extra layer of suspension.
- The stem-integrated display keeps your cockpit clean and easy to read.
Handling is more “truck” than “sports car.” If your riding includes fast fire roads, rough bike paths, or chunky singletrack, that’s a plus. If you mainly need to weave through tight city traffic or carry the bike up awkward stairwells, the sheer size will feel like overkill.
Everyday Utility & Use Cases
While the Onyx is clearly designed around adventure and off-road capability, it also works as a heavy-duty daily driver:
- High payload capacity (up to 560 lb) means it can comfortably handle a big rider plus gear, bags, and add-ons.
- The mid-drive system is efficient enough to make longer commutes or all-day rides realistic, especially if you’re willing to help by pedaling and shifting.
- Fat tires and full suspension make broken pavement, gravel connectors, and poorly maintained streets much more tolerable day to day.
Where it shines:
- Hilly suburbs and small mountain towns, where long climbs and steep shortcuts are part of normal riding.
- Forest roads, hunting trails, and back-country access, where you want the efficiency of a mid-drive plus the grip and comfort of fat tires.
- Bigger riders who routinely feel like they’re maxing out “standard” ebike frames and payload limits.
Pros & Cons
Pros
- 1300W peak mid-drive with 210Nm+ torque for serious climbing and loaded performance
- 48V 19.6Ah battery that complies with UL standards, with a realistic 35–65+ mile range for most riders
- Full-suspension chassis and 4.0″ fat tires for comfort and control on rough or loose terrain
- Tektro 4-piston hydraulic brakes for strong stopping power and better fade resistance
- 560 lb payload capacity makes it especially friendly for bigger riders and heavy cargo
- Torque + cadence sensors give a more natural, responsive assist feel than basic cadence-only setups
Cons
- At 89 lb, it’s heavy—lifting it onto basic car racks or up flights of stairs is real work
- One-size frame tuned for taller riders; shorter riders may struggle with the 31″ standover and tall minimum saddle height
- Fat tires and long wheelbase trade low-speed agility for stability
- Mid-drive systems require more attention to shifting (and can wear drivetrains faster) compared to simple hub setups
- Overkill if you mostly ride short, flat city trips at moderate speeds
Who the Mokwheel Onyx Is Best For
The Onyx is a strong fit if:
- You’re a taller rider who’s been frustrated by smaller “one-size” ebikes
- You want a mid-drive, full-suspension fat-tire platform that can actually climb and descend like a trail-ready machine
- Your riding includes significant hills, loose terrain, or mixed pavement + dirt
- You regularly carry heavy loads—whether that’s body weight, gear, or both
- You want a bike that can credibly fill the role of adventure rig and serious daily transport at the same time
Who Might Want a Different Bike
You might be better served by another model if:
- You’re under about 5’7″ or have a short inseam and prefer a lower standover and saddle height
- You need to carry your bike up stairs, mount it on basic trunk-style racks, or move it through tight indoor spaces often
- Your rides are mostly flat, short city commutes where a lighter, simpler hub-motor commuter would be easier to live with
- You prioritize ultra-nimble handling in dense traffic or super-tight bike paths over high-speed stability on rough ground
- You want a step-through frame for easier mounting and dismounting (in which case, Mokwheel’s step-through variants will be a better match)
Final Thoughts: Is the Mokwheel Onyx Worth It in 2025?
The Mokwheel Onyx isn’t trying to be a do-everything city bike for every rider. It’s a purpose-built, big-frame, mid-drive fat-tire machine aimed at tall riders who actually need:
- Real climbing power and torque
- A full-suspension chassis for rougher terrain
- A battery that makes long days and heavy loads feel normal, not edge-case
If you’re shorter, mostly riding flat city streets, or prioritizing ultra-lightweight bikes, this will feel like too much. But if you’re a taller rider in hilly or mixed-terrain country—and you’ve been waiting for a mid-drive fat-tire ebike that doesn’t feel underspecced—the Onyx is absolutely worth shortlisting.
👉 Check current pricing, color options, and available accessory bundles for the Mokwheel Onyx here.
