Why You Shouldn't Derestrict Your E-Bike？

As a brand specialising in e-bike conversion kits, one of the questions we hear most often is: "Can I remove the speed limiter on my e-bike?"

The honest answer is yes—technically, it can be done. We completely understand the appeal of riding faster. The extra speed can make every ride feel more exciting, especially on long, open roads.

However, just because it's possible doesn't mean it's a good idea.

The reality is that removing your e-bike's speed limiter is far from a harmless modification. While the promise of a higher top speed may sound appealing, the consequences can extend well beyond simply riding faster.

In this article, we'll explain why we don't recommend derestricting your e-bike—and why, in most cases, the risks far outweigh the rewards.

Legal Risk

In the UK, most road-legal e-bikes are classified as Electrically Assisted Pedal Cycles (EAPCs). To qualify as an EAPC, an e-bike must:

• Have pedals that can be used to propel the bike.

• Be equipped with an electric motor with a maximum continuous rated power of 250W.

• Stop providing motor assistance once the bike reaches 15.5 mph (25 km/h).

When an e-bike meets these requirements, it is treated in much the same way as a conventional bicycle. This means you don't need vehicle registration, insurance, road tax, or a driving licence to ride it (although riders must be at least 14 years old).

However, removing or bypassing the speed limiter means the bike no longer complies with the EAPC regulations. As a result, it may legally be considered a motor vehicle rather than a bicycle.

If that happens, additional legal requirements may apply, including vehicle registration, insurance, road tax, an appropriate driving licence, and the use of an approved motorcycle helmet. Riding a derestricted e-bike on public roads without meeting these requirements could lead to penalties under UK law.

For this reason alone, removing the speed limiter is a decision that should not be taken lightly.

Insurance Risk

Many e-bike manufacturers clearly state in their warranty terms that unauthorised modifications may void the warranty. If you remove or bypass the speed limiter, you could lose warranty protection for the motor, controller, battery, or other electrical components—meaning you'll be responsible for the full cost of any future repairs or replacements.

Insurance can also become a serious concern. If you're involved in a road traffic accident, insurers may investigate whether the e-bike had been modified and whether it still complied with the applicable regulations. A derestricted e-bike may affect the validity of your insurance policy or give the insurer grounds to refuse or reduce a claim, depending on the policy terms and the circumstances.

If the accident results in damage to property or, more importantly, injuries to yourself or others, the financial consequences can be substantial. Without valid insurance cover, you could be personally responsible for repair costs, compensation claims, legal expenses, and other liabilities.

Safety Risk

Research has shown that as an e-bike's speed increases beyond its intended limit, the risk of serious injury in a collision also rises. Higher speeds reduce the time available to react to unexpected hazards and significantly increase stopping distances.

This becomes even more critical in wet or slippery conditions. Whether it's a pedestrian stepping into the road, a car door suddenly opening, or a dog running into your path, those extra few miles per hour can make the difference between stopping safely and being involved in a serious accident.

Removing the speed limiter doesn't just increase the risk to you—it can also put pedestrians, cyclists, and other road users at greater risk.

In addition, when the speed limiter is removed, the controller is often required to deliver higher levels of power for longer periods. This places greater demands on the battery, which must discharge at a higher rate and for longer durations. As a result, battery temperatures can rise, accelerating cell ageing, reducing cycle life, and causing capacity to decline more quickly over time.

The motor and controller are also subjected to increased stress. This can lead to:

• Higher motor operating temperatures

• More frequent controller thermal protection

• Reduced motor efficiency

• Faster wear of mechanical and electrical components

Over the long term, consistently operating beyond the system's original design limits can shorten the lifespan of the motor, increase the likelihood of controller failure, and result in higher repair or replacement costs.

Ultimately, the factory speed limit isn't there simply to restrict performance—it's there to help ensure the entire e-bike system remains safe, reliable, and durable throughout its service life.

Trust Crisis

Responsible riding benefits not only individual cyclists but also the future of the entire e-bike industry. Widespread speed derestriction and other unauthorised modifications can damage public confidence in e-bike safety. When modified e-bikes are involved in accidents or ridden irresponsibly, they may reinforce negative perceptions of electric cycling and attract greater regulatory scrutiny.

Over time, this can undermine public trust, lead to stricter regulations, and create challenges for riders, manufacturers, retailers, and the wider cycling community.

By keeping e-bikes compliant with local regulations and riding responsibly, we can help build public confidence, support the sustainable growth of electric cycling, and ensure that more people continue to enjoy its many benefits for years to come.

Conclusion

For the vast majority of commuters and leisure riders, keeping the factory-set 25 km/h assistance limit is the safest, most cost-effective, and most sustainable choice.

A great e-bike experience isn't simply about riding faster. It's about achieving the right balance between safety, reliability, battery range, long-term durability, and compliance with local regulations.

As a brand specialising in e-bike conversion kits, we want every rider to enjoy the freedom and convenience that electric cycling offers—without compromising safety or reliability. By riding responsibly and keeping your e-bike compliant with the law, you not only protect yourself but also help create a safer environment for pedestrians, cyclists, and other road users.

Together, we can promote a more responsible cycling culture and contribute to a safer, more sustainable future for everyone.