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Cyclotricity 250/500W Mid Drive Electric Bike Conversion Kit

Regular price £425.00

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Equip your own bike with power assistance!

Wouldn’t it be great to keep cycling your ordinary bike yet never have to struggle with hills again? Or carry on your normal commute without having to arrive at work covered in sweat?

Now, you can! This electric bike kit (eKit) allows you to transform your bike into an e-bike for a fraction of the cost. Cycling will suddenly have a whole new dimension to it!


500W Mid/Crank Drive

This category is the all-rounder of E-Bike conversions. It is as light as the 250W Front Drive, but with the power of a 500W motor! In fact, it has torque much higher than the regular 500W Rear Drive kit, which makes it a much better hill climber.

It is positioned in the middle of the bike for the best weight distribution there is. It uses a 36V volt battery which makes it a fairly cost-effective purchase. The PAS and LCD screen are included by default making for an extra cost saving. It is also suitable for non-standard bikes that has unusual forks where hub motors don’t fit.


Key Benefits

The Cyclotricity 250W/500W motor kit offers a good combination of strong torque, high efficiency with low power consumption and noise output. The mid drive motor transfers power through the bikes gears, meaning the motor can operate within its optimum RPM range which is ideal for hill climbing.

The unique 250/500W system allows you to have a higher power option where it is safe and legal to do so while still maintaining the ability to use the low power option on the road for maximum efficiency.

The Cyclotricity kits can be fitted to standard bike frames through a simple installation process, detailed in our video guide.


Whats included:

  • Mid Drive Brushless Motor (with integrated controller). Restricted to 250W by default as a road legal kit. 500W mode reaches maximum speed of 32km/h once de-restricted (requires a signed disclaimer to derestrict for off-road use).
  • LCD Display
  • 42 Tooth Chain Wheel + Plastic Chain Cover.
  • 2 x Brake Levers.
  • Left And Right Crank Arms.
  • Speed Sensor + Magnet.
  • Waterproof Quick Release Cables.


Apart from a battery, the above is all that is needed to fully convert a bicycle into an electric bike. All you need to add is a battery (and the optional Throttle upgrade if required).

Conversion Kit Weight:
The full kit with no battery is approximately 5kg.
7AH + 9ah battery is approximately 3kg.
15AH battery is approximately 4kg.
17ah + 19ah battery is approximately 5kg.


Things to think about before purchasing this mid drive conversion kit:

- The bottom bracket of your bike will need to be between 68-73mm wide in order to work with this mid drive, you will also need to consider space for the motor.

- The chain ring is 42 tooth so chain line will need to be fairly standard and the chain may need to be lengthened or shortened depending on your bike configuration. Your local bike shop can help you with chain adjustments.

- You can only use this as a 1 ring set up. I.e. if you have 3 front gears, these will become one. With an electric motor installed, you won't need the front gears. 

- It's also a good idea to ensure you have enough room inside your frame triangle for your choice of battery:


Bottle Battery (mm)

Bottle Battery Dimensions



Frame Battery (mm)

Frame Battery Dimensions

Installation Video



10% of our profits from electric bike and electric scooter sales will be donated to Sustrans via Work for Good.

With every order of an e-bike or e-scooter through Pedal & Chain, you are contributing to the brilliant work Sustrans are doing.

Why Sustrans?

Sustrans are the UK charity making it easier for people to walk and cycle. The work they do creates healthier places and happier people. This aligns perfectly with our mission to enable people to be kinder to themselves and the planet.

They are custodians of the National Cycle Network, a UK-wide network of traffic-free paths for everyone, connecting cities, towns and countryside, loved by the communities they serve.


What difference can you make?

50,000 people a year die prematurely in the UK from exposure to the poor air quality on our busy city streets. Cars internally recirculate the pollution giving their occupants a double dose! Cyclists have much less exposure and an e-bike rider using quieter roads has practically none.

Sustrans brings people together to create places with clean air and green spaces, where friends and facilities are just a short walk away.

When you order an electric bike or e-scooter from Pedal & Chain, you are making a difference to communities across the UK.

If you're considering getting a new E-Scooter or E-Bike but don't have the cash to pay for one right now, financing may be a great solution for you. 

With PayPal Credit, you can spread the cost of your new ride across 4 monthly payments at no extra cost.



Login or create an account with PayPal to complete the PayPal Credit application



Once approved you'll have a credit limit linked to your PayPal account.


Go ahead and make your purchase using the PayPal option at checkout.


If you have any questions about PayPal finance, speak to us through our live chat or email

Why order from Pedal & Chain?

✔  We donate 10% of our profits to Sustrans
✔  14-days free electric bike insurance (applicable for EAPC bikes)
✔  30-day returns policy
✔  Best price guaranteed
✔  Access to mechanics nationwide 
✔  At least 6 months manufacturer's warranty
✔  Expert support from our friendly team
✔  Free E-Book with every E-Bike & Scooter order



Delivery times vary depending on the supplier, please find details for each product in the description tab on the product page.

Enjoy free home delivery on all orders over £500. Our nationwide couriers include FedEx, UK Mail, DHL and UPS.

Once your order has been placed, assuming it is in stock and available for dispatch, we will charge your card and your order will be dispatched within 5 working days. We’ll send you tracking details by email within 48 hours of your order being dispatched. If you have not received tracking details within 6 working days, please reach out to us via email at so that we can help.



Shop with confidence knowing that your product will be covered by a manufacturer's warranty. This means that if any faults should arise through normal use, we'll support you and arrange the repair or replacement with the manufacturer.



We can signpost you to experienced e-bike mechanics to assist you with services and repairs. We're committed to providing excellent aftercare so you can ride away knowing you'll be looked after. 



You have 30 days after receiving your item to request a return. 

Click here for full details of our returns policy.

You can always contact us for any return questions at



Any orders cancelled after 12 hours of placing the order may be subject to additional fees. If your order has been dispatched, you (the buyer) will be responsible for any costs associated with returning the item. Any refunds can only be issued to the same payment method which was used to place the order.

Customer Reviews

Based on 2 reviews
Tony G
Found Cyclotricity via internet

Found Cyclotricity via internet ordered a Midrive Kit for my montain Bike good comptive price intalled it the motor is powerful drives ok but later the battery went faulty replaced under guarantee ok

Tom H
Very pleased with the mid drive conversion kit

I bought the mid drive conversion kit in Feb 2020. The motor is 250w and can be deresticted to 500w for offroad use. I've been very pleased with the kit. It works well and has been reliable. I've mainly used it for commuting and recreational rides on road and forest tracks. I find i get out on the bike more often now i have this conversion kit and rarely use the car anymore. The kit is easy to fit if you are used to doing your own bike maintenance. I've been impressed with the range. On the lowest assistance level i can do a 50 mile hilly ride, and the battery indicator shows 1 bar left when i get home. If riding on full assistance i get about 30 miles, but then the motor is doing all the work. I quite often ride with a low level of assistance on the flat and just boost it for hills to maximise the range.


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