What should you look out for when buying a fatbike?
A fatbike practically sells itself. Right? The tires wide, the frame is low… in short, it really gives the impression that you can ride it anywhere. That’s true, but only if you ask the right questions before buying it. How powerful is the motor? Will you still be able to order a battery in two years? Are the documents provided up to code? That’s the difference between a bike that lasts for years and a toy that looks great until the first breakdown.
Written by: Jos Mans | April 7, 2026 | Reading time: 5minutes
About the author: Jos Mans
Jos is a writer and cyclist, most often both at the same time. With thousands of miles under his belt and just as many words on paper, he combines his two great passions: being on the move and telling stories.
Key findings
- Legality takes precedence over appearance. In the Netherlands, a fatbike is legal only if the motor does not exceed 250 watts, the motor assistance cuts out at 25 km/h, and it operates only when you are pedaling. Be sure to check these requirements before purchasing.
- The cheapest model is rarely the most cost-effective. Unbranded imports often lack documentation, replacement batteries, and after-sales service—all of which become essential after 18 months.
- A fatbike isn't the best choice for everyone. For daily commutes on paved roads, a standard urban e-bike is lighter, more efficient, and easier to maintain.
The difference between a standard e-bike and a fatbike
| Criteria | Fatbike | Urban e-bike |
|---|---|---|
| Comfort on cobblestones/sand | ✓ Excellent | ◑ Correct |
| Performance on asphalt | ✗ Average | ✓ Excellent |
| Weight | 25–30+ kg | 18–24 kg |
| Autonomy | 40–70 km | 60–120 km |
| Maintenance costs | Upper parts (tires, brakes) | Weaker |
| Is a statutory audit required? | Yes, always | Basic compliance |
| Ideal for commuting | ◑ Less logical | ✓ Excellent choice |
Main question: Is this bike legal?
In the Netherlands, a fatbike isn’t automatically classified as a separate category. It gets its name from its tires , but the law focuses on the motor. The rules are clear: a maximum of 250 watts, assistance only while pedaling, and a gradual reduction in power that stops at 25 km/h.
If the model has a throttle that allows it to move forward without pedaling, it is no longer legally classified as an e-bike. Without certification or registration, the vehicle is not permitted on public roads.
This isn't just theory: the police regularly conduct inspections using dynamometers. Fatbikes have already been taken off the road, fines have been issued, and vehicles have been impounded.
Quality: frame, brakes, and motor
A fatbike is heavy and subjected to significant stress: heavy weight, tires , sometimes a passenger, not to mention sidewalks, speed bumps, and cobblestones. This calls for a sturdy frame.
On unknown imported models, one often finds poor welds, loose steering, and no identifiable manufacturer—defects that go unnoticed at the time of purchase but become problematic with use.
Brakes are no small matter. A 28-kg fatbike traveling at full speed requires high-performance hydraulic disc brakes. Shimano and Tektro are common brands found on high-quality models. Cheaper models often use unbranded mechanical brakes, which are inadequate for heavy use.
Essential test: Try hard braking at 20 km/h—don’t just take a leisurely ride.
When it comes to the motor, always test how it starts up—ideally on a hill. Systems like Bosch Active Line or Shimano Steps E5000 provide smooth assistance. Lower-end systems are jerky and tiring over time.
Battery and service: the true cost
The battery is the most expensive part of an e-bike. With well-known brands (Bosch PowerTube, Shimano Steps BT-E8035), you know what to expect: clear capacity specifications, easy replacement, transparent pricing, and wide availability.
With an anonymous import model, it’s common for replacement batteries to be unavailable after two years, or to be available only through a website with no customer service.
Please check :
- Is the battery brand listed?
- Is it removable?
- What is the replacement cost?
- Is there an after-sales service?
A fatbike that doesn't provide clear answers to these questions is generally best avoided.
For refurbished models sold through certified platforms like Upway, the situation is different: the battery has been tested, wear-and-tear parts have been replaced, and the documentation is up to standard. With tires the Schwalbe Fat Frank or Kenda Juggernaut, you’re sure to find replacement parts.
Is a fatbike really right for you?
This is probably the most overlooked question. Many buyers would have been better off with a standard urban e-bike—not because fatbikes are bad, but because they’re designed for a specific purpose.
Choose a fatbike if:
- you often drive on cobblestones, sand, or roads in poor condition,
- if comfort is your priority,
- You accept the extra weight in exchange for stability and traction.
Avoid it if:
- you drive on asphalt every day,
- Are you looking for efficiency and lightness?
- You need a long battery life.
On the road, a city bike like the Gazelle Ultimate or Batavus Finez is faster, lighter, and more energy-efficient. The real question isn’t about aesthetics, but functionality: does your usage justify a fatbike?
FAQ
What is the maximum motor power allowed for an electric fatbike?
In the Netherlands, the limit is 250 watts, with assistance up to 25 km/h only when pedaling. Otherwise, the bike is not legal without certification.
Why are cheap fat bikes risky?
They often lack compliance documents, have poor-quality brakes, and offer no guarantee of parts or battery availability.
refurbished buying a refurbished fatbike a good idea?
Yes, provided it comes from a reputable brand and a certified source. The battery has been inspected, parts have been replaced, and the documentation is in order.
When is it better to choose a standard e-bike?
For everyday use on asphalt, where lightness, efficiency, and long battery life are essential.