Mid-Drive vs Hub Motor: Which Is Best for E-Bike Conversions?

If you're thinking about converting your bike to electric, one of the first choices you'll face is what type of motor to use: mid-drive or hub motor. While both can provide pedal assistance, they deliver very different riding experiences.

At E-MY-BIKE, we specialise exclusively in mid-drive motor conversions - and for good reason. Here's everything you need to know when deciding which system is best for your e-bike conversion in the UK.

1. What Is a Hub Motor?

A hub motor is installed in the front or rear wheel hub. When the motor runs, it directly turns the wheel, helping you move forward. These systems are common in lower-cost kits and many entry-level e-bikes.

Pros:

• Simple installation

• Lower upfront cost

• Fewer moving parts

Cons:

• Can feel unbalanced, especially in front-wheel setups

• Less torque and hill-climbing ability

• Doesn't benefit from your bike's gears

• Higher battery drain under load

2. What Is a Mid-Drive Motor?

A mid-drive motor is mounted at the crank (bottom bracket), where the pedals connect. Instead of turning the wheel directly, it drives your bike's chain or belt, just like you do when pedalling.

Pros:

• Superior torque and climbing power

• Works with your gears for efficiency

• Better weight distribution and balance

• Improved range per charge

Cons:

• Slightly higher cost

• More complex installation (best done professionally)

3. Which One Performs Better?

If you're riding on flat roads at low speeds, a hub motor might seem fine. But the moment you hit a hill, carry extra weight, or want to preserve battery life - the mid-drive wins by a mile.

Why mid-drive motors are better:

• Use your bike's gears to optimise power

• Better on hills, trails, and rough terrain

• More responsive and smoother assist feel

At E-MY-BIKE, we install high-torque mid-drive motors powered by Samsung cells, so you can climb with confidence and cruise with ease.

4. Legal & Practical Considerations in the UK

Both hub and mid-drive motors can be made road legal if they follow UK e-bike laws:

• 250W power limit

• 15.5mph max assist speed

• Pedal-assist only (no throttle)

But beware - many cheap hub motor kits available online exceed these limits, making them illegal to ride without insurance, registration, or a licence.

Our conversions are fully UK-compliant and come with a 2-year fitting warranty.

5. Why We Choose Mid-Drive Every Time

We’ve tried and tested both systems. For real-world riding, especially in the UK’s varied terrain, mid-drive delivers better performance, comfort, and value.

• Smooth integration with your bike

• Reduced wear on brakes and drivetrain

• More natural ride feel

We focus on doing one thing really well: professional mid-drive electric bike conversions, tailored to your frame and riding needs.

Final Thoughts

If you're serious about converting your bike to electric - and want a powerful, reliable, and road-legal system - a mid-drive motor is the best choice.

At E-MY-BIKE, we make the process simple with courier collection across the UK, expert installation, and aftercare you can trust.

Get in touch today to book your conversion or learn more about our mid-drive system.