E-bikes are a great way to travel efficiently and sustainably. However, many riders feel limited by the factory-set speed restrictions and wonder if they can remove them to make their e-bikes go faster. While derestricting an e-bike is technically possible, it comes with legal, safety, and mechanical risks that you should understand before making any modifications.
In this guide, we’ll explore what derestriction means, whether it’s legal, the risks involved, and what alternatives exist for getting better performance out of your e-bike.
What Does It Mean to Derestrict an E-Bike?
Most e-bikes are designed with a built-in speed limit that restricts motor assistance. In the UK and EU, this limit is 15.5 mph (25 km/h), while in the U.S., some e-bikes allow assistance up to 20-28 mph (32-45 km/h) depending on classification.
Derestricting an e-bike involves modifying the system to override these limitations, allowing the motor to continue providing assistance at higher speeds. This is typically done through one of the following methods:
- Removing or altering the speed sensor that limits motor assistance.
- Installing a tuning kit or software modification to change the bike’s settings.
- Replacing the controller to adjust power output.
While these changes might seem appealing to those who want faster rides, they come with serious drawbacks.
Is It Legal to Derestrict an E-Bike?
In most countries, derestricting an e-bike is illegal for use on public roads because it effectively turns it into a motor vehicle.
In the UK and EU, an e-bike is legally classified as an Electrically Assisted Pedal Cycle (EAPC) if:
- The motor does not exceed 250W.
- The motor assistance cuts off at 15.5 mph (25 km/h).
- The bike still requires pedaling for the motor to work.
Once you derestrict an e-bike, it no longer meets these criteria and is legally classified as a moped or motorcycle. This means you would need to:
- Register the bike with the DVLA (UK) or local transport authority.
- Get insurance and pay road tax.
- Hold a valid driving license.
- Wear a motorcycle helmet.
- Avoid cycling lanes and trails, as motor vehicles are not allowed on them.
If caught riding a derestricted e-bike illegally, you could face fines, bike confiscation, and legal consequences. Some countries, like France, impose fines of up to €30,000 for illegal e-bike modifications.
Safety Risks of Derestricting an E-Bike
Beyond legal issues, removing your e-bike’s speed restrictions can be dangerous for both the rider and others.
- The bike’s design may not support higher speeds
- Brakes, tires, and suspension on most e-bikes are built for speeds under 15.5 mph (25 km/h).
- At higher speeds, braking distances increase, and accidents become more severe.
- Increased battery drain and overheating
- The motor and battery are optimized for the default speed limit.
- Pushing past these limits reduces battery life, causes overheating, and can damage the electrical components.
- Higher risk of accidents
- Reaction time is reduced at high speeds.
- If you lose control or encounter an obstacle, crashes can be more serious.
- Voiding manufacturer warranty
- If you modify your e-bike, the manufacturer will not cover repairs or replacements.
- Service centers may refuse to work on altered bikes.
Will Manufacturers Know If You Derestrict an E-Bike?
Many modern e-bikes track system modifications through built-in software. Manufacturers can detect speed limit overrides, tuning devices, or altered controllers, making it easy for them to deny warranty claims.
Even if you reverse the modifications before taking your e-bike for servicing, the system logs may still show past changes.
Are There Legal Ways to Make an E-Bike Faster?
If you want better performance without breaking the law, consider these alternatives:
- Upgrade the battery: A higher-capacity battery allows your e-bike to maintain its maximum legal speed for longer.
- Use a mid-drive motor: Mid-drive motors are more efficient and powerful than hub motors, improving hill climbing and acceleration.
- Optimize your riding style: Reduce weight, maintain proper tire pressure, and avoid excessive braking to maximize efficiency.
- Choose a faster legal e-bike: In some countries, Class 3 e-bikes allow motor assistance up to 28 mph (45 km/h), which is legal for road use.
Should You Derestrict Your E-Bike?
If you plan to ride only on private land, derestriction may be an option. However, using a modified e-bike on public roads is illegal in many places and carries risks of fines, confiscation, and safety hazards.
Before making any modifications, consider the consequences and whether the added speed is worth the potential risks.
Final Thoughts
Derestricting an e-bike might sound tempting, but it can lead to legal trouble, safety hazards, and loss of manufacturer support. Instead, look for legal performance upgrades or choose a faster e-bike model that meets regulations.
If you’re unsure about your local laws, always check with transport authorities before making any changes to your e-bike.