How Fast Do Electric Bikes Go

This guide explains how to approach how fast do electric bikes go, including the preparation, practical steps, common mistakes, and final checks that help you finish with confidence.

15 mins: Reading time
Easy Difficulty
Illegal modifications Watch out for

Before You Start

Check first: In the UK, any electric bike that provides motor assistance above 15.5 mph is legally considered a motor vehicle. To be used on public roads, it must be registered, taxed, and insured as a moped, and the rider needs a suitable driving licence and helmet.

Step-by-Step Instructions

Quick Reference

Common Problems When Understanding E-Bike Speed

My e-bike feels much slower than 15.5 mph.

The motor cuts out abruptly when I hit a certain speed.

I've seen an electric bike online that claims to go 35 mph.

Advanced Tips for Managing E-Bike Speed

  • Maintain a High Cadence: E-bike motors, particularly mid-drives, are most efficient when you pedal at a steady, brisk pace (around 70-90 RPM). Instead of pushing hard on a big gear, shift to an easier gear and spin your legs faster. This helps the motor work in its optimal range, delivering power smoothly and efficiently, and also extends battery life.
  • Be Smart with Assistance Modes: Don't just leave your bike in "Turbo" mode all the time. On flat sections or downhills where you can easily maintain speed, switch to a lower assistance level like "Eco" or "Tour". This saves a significant amount of battery, ensuring you have full power available for when you really need it, like on a steep hill.
  • Think About Aerodynamics: Once you go faster than about 12 mph, wind resistance becomes the main force slowing you down. On a windy day or when trying to pedal beyond the 15.5 mph assist limit, getting into a slightly lower, more tucked riding position can make a noticeable difference to your top speed and efficiency.
  • Choose the Right Tyres: If you primarily ride on paved surfaces, switching from knobbly off-road tyres to smoother, slicker commuter or road tyres will reduce rolling resistance. This makes it easier to accelerate and maintain speed, especially above the motor's cut-off point. Ensure they are inflated to the recommended pressure.

How Fast Do Electric Bikes Go FAQ

Is it illegal to derestrict an electric bike in the UK?

Can I go faster than 15.5 mph on an e-bike at all?

How fast is a 500W or 1000W electric bike?

Are there different classes of e-bikes?

Final Checklist for Understanding E-Bike Speed

  • Confirm the legal assisted speed limit is 15.5 mph (25 km/h) for UK public roads.
  • Verify that the motor's continuous power rating does not exceed 250 watts.
  • Understand you can pedal faster than the assisted limit through your own effort.
  • Recognise that real-world speed is affected by hills, wind, rider weight, and tyre pressure.
  • Distinguish between standard EAPCs and faster S-Pedelecs, which are legally classified as mopeds in the UK.
  • Commit to never riding a "derestricted" e-bike on public roads.