Electric bikes are changing the way people move across UK towns and cities — but what if you already own a perfectly good bicycle? An eBike conversion kit might be the perfect way to go electric without buying a brand-new e-bike.
In this guide, we’ll explain what an eBike conversion kit is, how it works, whether it’s legal in the UK, and how to choose the right kit for your needs.
What Is an eBike Conversion Kit?
An eBike conversion kit is a set of components that allows you to turn a normal pedal bike into an electric one. Most kits include:
An electric motor (either in the hub or as a mid-drive unit)
A battery and battery mount
A controller to regulate power
A pedal sensor or throttle
Display or control unit
Wiring and brackets
These kits are designed to fit on most standard bikes, including mountain bikes, road bikes, hybrid bikes, and even some folding bikes.
Why Choose an eBike Conversion Kit?
There are several reasons people in the UK are opting for conversion kits:
Cost-effective: Often much cheaper than buying a new e-bike
Sustainable: Reuse your existing bike frame and parts
Customisable: Choose motor power, battery size, and assist level to match your needs
Satisfying: DIY installation can be a fun weekend project
If you’re happy with your current bike but want the boost of electric assist, a conversion kit might be your ideal solution.
Are eBike Conversion Kits Legal in the UK?
Yes — as long as the converted bike meets UK EAPC (Electrically Assisted Pedal Cycle) standards:
Maximum motor power: 250W
Assistance limited to 15.5mph (25km/h)
Motor only operates while pedalling (no throttle-only bikes unless registered as mopeds)
If your converted e-bike meets these rules, you don’t need a licence, insurance, tax, or MOT — and you can ride it on public roads and cycle lanes like any normal bicycle.
⚠️ Tip: If you install a throttle-only kit that doesn’t require pedalling, it may need registration with the DVLA and could be classified as a moped.
Hub Motor vs Mid-Drive: Which Should You Choose?
There are two main types of motors in eBike conversion kits:
Hub Motor Kits
Installed in the front or rear wheel
Quieter and easier to install
Affordable and reliable
Best for flat to moderate terrain
Mid-Drive Kits
Mounted at the bottom bracket (crank area)
More efficient power delivery
Better for hills and heavier loads
Typically more expensive and complex to install
For most UK riders, a rear hub motor kit is a good balance of cost, simplicity, and performance.
What to Consider Before Buying a Kit
When choosing an eBike conversion kit, think about:
Compatibility: Will it fit your current bike frame and wheels?
Battery capacity: Look for 36V or 48V with 10Ah–15Ah depending on your range needs
Weight: Kits can add 5–8kg to your bike
Brake compatibility: Some kits work better with disc brakes
Weather resistance: Important for UK weather!
Also, choose a reputable UK seller or brand that offers after-sales support and spare parts availability.
Installation: DIY or Professional?
Many kits are designed for home installation using basic tools. If you’re confident working with bikes, you can convert your bike in a few hours. YouTube tutorials and user manuals are widely available.
If not, many local bike shops in the UK now offer conversion services, usually charging £100–£250 for installation.
Top eBike Conversion Kit Brands Available in the UK
Here are some popular kits trusted by UK riders:
Swytch – Lightweight, front-wheel motor, easy to install
Bafang – Mid-drive systems with powerful performance
YOSE POWER – Affordable hub motor kits with UK support
Tongsheng TSDZ2 – Mid-drive with torque sensor for a more natural feel
Always check whether the kit includes the battery — some brands sell it separately.
Who Is an eBike Conversion Kit Best For?
Commuters looking to upgrade their ride
Cyclists who love their current bike but want a power boost
Budget-conscious buyers
DIY enthusiasts
Rural riders needing help with long distances or hills
Pros and Cons of eBike Conversion Kits
Pros
✅ Cost-effective
✅ Environmentally friendly
✅ Reuse your existing bike
✅ Customisable performance
Cons
⚠️ May void your bike’s warranty
⚠️ Adds weight
⚠️ Installation can be fiddly
⚠️ Some kits lack water resistance for UK rain
Final Thoughts: Is a Conversion Kit Worth It?
If you want the benefits of an e-bike without the high price tag, an eBike conversion kit is an excellent option. With the right setup, you can enjoy assisted riding, cut your commuting time, and reduce your carbon footprint — all while keeping the bike you love.
For UK roads, a 250W rear hub kit with a 36V battery is ideal for legal, hassle-free riding.
Whether you install it yourself or ask a local shop, going electric is easier than ever — and your legs will thank you.
