Top 10 Best Electric Bike Conversion Kits in the UK: Ultimate Guide 2025

Looking to upgrade your bicycle into a powerful, eco-friendly machine? Whether you're commuting through city streets or exploring rugged trails, electric bike conversion kits offer a smart way to enhance your ride without buying a brand-new e-bike. In this 2025 guide, we explore the top 10 best electric bike conversion kits available in the UK, covering a range of power levels, battery options, and compatibility to suit every type of cyclist.

From mid-drive motors to high-power hub systems, we’ve curated the best kits to meet UK ebike regulations while delivering top-tier performance.

• Affordable Options: Kits start as low as £269 for basic models.
• Performance Range: Choose from 250W (road-legal) to 4000W (off-road) motors.
• UK Legal Compliance: 250W power limit and 25 km/h speed cap for public roads.
• Top Pick: KirbEbike 36V 250W Kit (£308) – Ideal for city commutes with a 30–40 km range.
• Advanced Options: 48V 1000W (£365) for mixed terrain and 72V 4000W (£670) for steep climbs.

Quick Comparison

10 Best E-Bike Conversion Kits (UK 2025)

Explore KirbEbike's full range of conversion kits, tailored to suit various riding styles and legal requirements in the UK.

1. KirbEbike 52V 2000W MTX Rim Ebike Kit

Perfect for thrill-seekers and long-distance commuters, the KirbEbike 52V 2000W MTX Rim Kit combines raw power and efficiency. With a 2000W brushless hub motor and 52V battery support, it’s designed for riders who need serious torque and speed across a wide range of terrain.

Key Features:

• 2000W rear hub motor – ultra-reliable and silent
• Available with 52V lithium-ion battery
• LCD screen with PAS levels, speed, and range data
• Easy installation on standard bike frames
• Compatible with MTB, road, and hybrid bikes

Specifications:

2. KirbEbike 72V 4000W Extreme Off-Road Kit

Push the boundaries with KirbEbike’s 72V 4000W Extreme Kit, designed for aggressive off-road adventures. This high-torque monster offers blistering acceleration and hill-climbing power, making it ideal for custom builds or trail-tuned mountain bikes.

Key Features:

• 4000W rear hub motor for insane torque
• 72V battery support for extended range
• Programmable controller for custom settings
• Optional hydraulic brake cut-off levers
• Designed for 135–145mm dropout frames

Specifications:

3. Bafang BBS02B 48V 750W Mid-Drive Kit

The Bafang BBS02B mid-drive system provides excellent climbing power and weight distribution. It’s ideal for UK cyclists tackling hilly terrain while maintaining a natural ride feel.

Key Features:

• Integrated 750W mid-drive motor
• Compatible with most bottom brackets
• Maintains bike’s gear efficiency
• LCD display and PAS customization
• Suitable for city, MTB, and touring bikes

Specifications:

4. KirbEbike 36V/48V Mid Motor Kit

If you're after a discreet yet powerful mid-motor kit, the KirbEbike 36V/48V Mid Motor Kit is a superb option. Offering a natural pedaling feel and great climbing ability, it’s perfect for urban riders wanting efficiency and stealth.

Key Features:

• Mid-drive system with high torque output
• Optional 36V or 48V battery support
• Supports multiple wheel sizes and crank types
• PAS sensor and LCD included
• Quiet and efficient motor design
• Specifications:

5. Swytch Universal Conversion Kit

Best Lightweight Front Wheel Conversion Kit (UK Legal)

The Swytch Kit is a UK favorite for its ultra-light design and quick install. With a 250W front hub motor, it stays within UK ebike regulations and suits everyday riders needing assistance for commutes.

Key Features:

• Lightweight 1.5kg front motor
• Compact removable battery pack
• 250W UK road legal
• Wireless pedal sensor
• Works with any bike

6. KirbEbike 1500W–2000W Fat Tire Kit

Best Kit for Fat Bikes and Heavy Loads

This heavy-duty rear hub motor kit is built for fat tire bikes and cargo haulers. It delivers superb power and control, even on sand, snow, or steep hills.

Key Features:

• Powerful 1500W–2000W hub motor
• Fat tire compatibility (up to 4" wheels)
• High-torque controller and PAS sensor
• Optional throttle + pedal assist modes
• Long-range lithium battery options

7. Yose Power 36V 250W Rear Hub Kit

Best Budget Conversion Kit for Everyday Use

For riders wanting a reliable and affordable entry into e-bikes, Yose Power delivers with this simple 250W rear hub kit. It’s UK legal, easy to install, and perfect for commuters.

Key Features:

• 250W rear hub motor
• Pre-built rear wheel for quick conversion
• Battery with integrated controller
• LCD display and brake cut-offs
• Quiet and efficient on city roads

8. KirbEbike 60V 2500W–3000W Off-Road Kit

For off-roaders and technical trail riders, this KirbEbike 60V 2500W–3000W kit hits the sweet spot between speed, torque, and rugged reliability.

Key Features:

• Rear hub motor with up to 3000W output
• 60V controller with smart LCD
• Strong off-road acceleration
• Compatible with full-size mountain bikes
• Ideal for trail, dirt, and forest tracks

9. CYC Photon Torque-Sensing Mid Drive Kit

Best for Custom E-MTB Builds and Precise Power Delivery

The CYC Photon is one of the most advanced mid-drive systems on the market. With its torque-sensing pedal assist and modular design, it’s made for high-end MTB conversions.

Key Features:

• Torque + cadence sensing for intuitive control
• Peak 750W–1000W output
• Quiet, compact mid-motor
• Wide BB compatibility (68–120mm)
• Bluetooth controller + mobile app

10. Voilamart 1000W Rear Wheel Kit

This kit is a hit among DIYers looking for a strong motor without breaking the bank. Voilamart’s 1000W kit delivers solid performance for off-road use at a low price point.

Key Features:

• 1000W brushless rear hub motor
• Comes with controller, display, and throttle
• No battery included (DIY-friendly)
• Rear wheel pre-laced
• Great for hobby and leisure rides

KirbEbike Product Guide

KirbEbike offers a range of e-bike conversion kits designed for quick and easy installation. These plug-and-play modules can be set up in just 20–30 minutes and are equally simple to remove for maintenance. The entry-level option, the 36V 250W kit, includes a 250W motor paired with a 36V 13Ah lithium battery.

Pricing starts at £308 for the 36V 250W kit, £365 for the 48V 1,000W kit, and £670 for the 60V 3,000W kit. All kits are compatible with standard 26″–29″ wheels and frame widths of 135–170 mm. Optional extras include a controller, throttle, and lighting upgrades.

Riding Options

The 36V 250W kit is ideal for city commutes, keeping within the 25 km/h legal speed limit. For those seeking more power and speed, the 48V and 60V kits offer enhanced torque and performance, suitable for both road and off-road adventures.

UK Customer Support

• Free shipping across the UK
• One-year warranty covering all components
• Easy access to spare parts
• Local support for fast troubleshooting and replacements

Common Questions

Here’s a quick guide to FAQs on UK e-bike laws, checking compatibility, and essential maintenance tips.

UK Legal Requirements

As explained in 'UK Laws for E-Bikes', e-bike kits must adhere to the 250 W/25 km/h Electrically Assisted Pedal Cycle (EAPC) regulations. KirbEbike's 36 V 250 W kit meets these standards. Kits with higher power are only suitable for use on private property or off-road.

Compatibility Summary

It’s important to match your bike’s frame, wheel size, brake type, and bottom bracket with the kit specifications. You can find detailed guidance in the 'Matching Your Bike' section above.

KirbEbike kits are crafted to fit a variety of standard bike frames. Always double-check your bike's specifications against the kit details before purchasing.

Basic Maintenance Guide

Battery Care

• Charge after each ride and avoid letting the battery fully discharge.
• Store the battery at around 50% charge in a cool, dry location.
• Always use the charger provided and avoid overcharging.

Cleaning & Inspection

• Use a soft cloth and mild detergent to clean components.
• Apply an e-bike-specific lubricant to moving parts.
• Regularly check electrical connections and motor mounts.
• Inspect tyres, brakes, and the battery housing for any damage before each ride.

KirbEbike customers can rely on our UK-based support team for detailed maintenance advice and access to spare parts. This helps keep your e-bike in great condition while protecting your warranty and ensuring safe operation.

Summary and Recommendations

KirbEbike offers a range of kits that combine performance, compliance, and affordability. For example, the 36V 250W kit (£308) provides pedal assistance up to 25 km/h with a range of 30–40 km. Choosing the right kit and ensuring proper installation are key to getting the most out of your e-bike.

It's crucial to have a qualified technician handle the installation. This ensures correct torque settings, safe wiring, and keeps your warranty intact. For urban commutes, the 36V 250W kit is a solid choice. If you're into casual weekend rides, the EZ Rider may suit you better. Off-road enthusiasts might want to go for the 48V 1000W kit, which offers higher torque and a longer range.

Don’t forget to upgrade your brakes to handle the extra speed and weight. KirbEbike provides UK-based support, a one-year warranty, and spare parts readily available. To avoid voiding your bike's original warranty, check with a local bike shop before installation.

When selecting the best ebike conversion kit in the UK, consider:

• UK Ebike Laws: 250W limit for road use, 15.5 mph speed cap, and no throttle without certification.
• Riding Style: City commuters may prefer mid-drive or front wheel kits, while off-road riders benefit from high-power rear hub motors.
• Battery & Range: Choose voltage and amp-hours based on distance and terrain.
• Installation: Rear wheel kits are simpler, mid-drives offer better weight distribution but require bottom bracket compatibility.

Ready to Ride Electric?

Whether you're upgrading your daily commuter or building a trail-shredding beast, these top 10 electric bike conversion kits offer unmatched performance, compliance, and value. For top-tier support and high-power options in the UK, check out the full range at KirbEbike.