Looking to upgrade your regular bike into a high-performance electric machine? A premium electric bike conversion kit with battery is the most cost-effective and flexible way to electrify your ride — without buying a brand-new e-bike. Whether you're a daily commuter, trail explorer, or speed enthusiast, choosing the right electric bike conversion kit can transform how and where you ride.
In the UK market, ebike kits are evolving fast and in 2025, riders are demanding more than just basic pedal assist. From powerful 72V systems built for off-road adventures to 52V commuter-friendly kits with extended range and fast-charging batteries, there’s never been a better time to invest in a complete electric conversion kit for your bike.
In this guide, we’ll cover the best electric bike conversion kits with battery in the UK, including high-powered options from KirbEbike one of the leading names in DIY ebike upgrades. You’ll discover the top kits for speed, range, ease of installation, and legal on-road use — all backed by real-world performance specs and expert insight.
Why Choose an Electric Bike Conversion Kit with Battery?
Choosing an electric bike conversion kit with battery is one of the smartest ways to upgrade your current bicycle into a high-performance e-bike. Instead of spending £2,000+ on a prebuilt ebike, conversion kits allow you to:
Save Money
A full conversion kit with battery can cost half the price of a comparable e-bike — and it uses your existing frame.
Ride the Bike You Already Love
No need to compromise on fit, geometry, or comfort. Convert your mountain, road, or hybrid bike in under an hour.
Get Custom Power + Range
From 52V commuter kits to 72V trail beasts, you can choose the level of speed, torque, and distance you need — and upgrade anytime.
Complete Kit = No Guesswork
Buying a kit with battery included ensures full compatibility between the motor, controller, and power system — and usually adds warranty protection.
UK Legal Mode Toggle
Many premium kits now come with built-in 250W / 25km/h speed limit functions, so you can stay road-legal and still enjoy full power off-road.
Whether you're commuting daily or exploring mountain trails, a conversion kit with battery offers the best mix of value, flexibility, and performance.
Top 4 KirbEbike Kits for Every Type of Rider in 2025
Here’s a side-by-side comparison of the best electric bike conversion kits with battery from KirbEbike, covering everything from commuter setups to extreme-performance builds.
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KirbEbike 52V 2000W MTX Rim Kit
Perfect for: High-speed urban commutes, moderate off-road use
A well-balanced, high-torque 52V kit with a quiet direct-drive motor, road-legal limiter, and 30-minute install time. Ideal for daily riders who want more power without going extreme.
Key Features:
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2000W motor, 60Nm torque
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Top speed: 50–60km/h
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FOC sinewave controller for smooth acceleration
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Road-legal limiter (250W / 25km/h)
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Battery Options: 52V 20Ah (40–60km range)
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52V 30Ah (up to 80km range)
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KirbEbike 60V 3000W MTX PRO Kit
Perfect for: Off-road adventurers, speed riders, heavy commuters
Built for performance. With 80Nm torque and a 60V system, this kit offers great balance between top-end speed, climbing power, and efficient power delivery.
Key Features:
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3000W peak motor, 80Nm torque
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Top speed: 45+ MPH
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50A sinewave controller
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IP66 waterproofing + smart cruise control
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Battery: 60V 20Ah LG Battery
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Range: 40–80km
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KirbEbike 72V 4000W MTX PRO Kit
Perfect for: Trail beasts, hill climbers, fat tire e-MTBs
The ultimate 72V high-performance ebike kit. With 110Nm torque, 55+ MPH top speeds, and 60A power output, this is for serious riders who want max power and durability.
Key Features:
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4000W peak power
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110Nm torque
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60A FOC controller with 18-MOSFETs
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PAS levels + 250W legal limiter
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Battery:72V 20Ah LG/Samsung
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Range: 40–80km
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KirbEbike 52V 2600W MTX Kit
Perfect for: Long-range touring, fast commuting with more punch
A step up from the 2000W kit, the 2600W version offers stronger acceleration and hill-climb capability, while still maintaining a comfortable urban-friendly setup.
Key Features:
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2600W direct-drive motor
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Up to 60km/h speed
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Works with 7–11 speed systems
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Complete tool + sensor bundle included
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Battery:52V 30Ah with 5A fast charger
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Range: 60–80km
Side-by-Side Comparison: KirbEbike's Top 4 Kits
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Feature
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52V 2000W
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60V 3000W
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72V 4000W
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52V 2600W
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Peak Power
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2000W
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3000W
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4000W
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2600W
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Voltage
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52V
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60V
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72V
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52V
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Torque
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60Nm
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80Nm
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110Nm
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65Nm
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Top Speed
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50–60 km/h
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70+ km/h
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85–90 km/h
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60 km/h
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Range (Max)
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80 km
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80 km
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80 km
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80 km
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Battery Options
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20Ah / 30Ah
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20Ah
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20Ah
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30Ah
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Best For
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Fast commuters & mixed terrain
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Trail & off-road adventurers
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Extreme off-road + fat tires
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Touring riders & fast commuters
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Price Range
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£823.65
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£1,241.00
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£1,380.00
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£1,180.00
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Best Electric Bike Conversion Kit with Battery for 2025
If you're in the UK and ready to convert your bike into a high-performance e-machine, the best kit depends on your riding goals:
Best for Commuting
52V 2000W Kit: Fast, road-legal when limited, lightweight, and budget-friendly.
Best for Trail Performance
60V 3000W Kit: More torque and speed for hill climbs, gravel roads, and throttle control.
Best for Off-Road & Fat Tire Riding
72V 4000W Kit: The most powerful option for extreme terrain, speed, and high torque loads.
Best for Long-Range & Touring
52V 2600W Kit: Balanced performance with extended range, ideal for riders who want a step above 2000W.
UK Road-Legal Considerations for Electric Bike Conversion Kits
When using an electric bike conversion kit with battery in the UK, it’s important to stay informed about local regulations. Thankfully, all KirbEbike kits include a built-in legal mode, making it easy to comply when needed.
What Makes an Ebike Road-Legal in the UK?
To ride on public roads without a licence, registration, or insurance, your e-bike must:
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Be pedal-assisted only (no throttle-only operation)
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Have a motor rated no more than 250W
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Have a maximum assisted speed of 25 km/h (15.5 mph)
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Be operated by someone 14 years or older
How KirbEbike Kits Stay Compliant
All KirbEbike kits — from 2000W to 4000W — feature:
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A display-based limiter switch: Press and hold the “Up” button for 2 seconds to activate 250W mode
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Throttle deactivation when speed limiter is active
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Multi-level PAS (Pedal Assist System) for full user control
Installation & Maintenance Tips for KirbEbike Conversion Kits
One of the best parts of KirbEbike kits is that they’re DIY-friendly and built for long-term use. With a bit of prep and basic tools, you can have your bike converted in less than an hour.
Installation Best Practices
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Check your dropout spacing (135–190mm) before ordering
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Ensure your frame triangle fits the battery (especially 72V units)
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Use the included torque arm to protect your frame from motor force
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Don’t forget to tighten brake sensors and secure all wiring with the provided cable ties
Basic Maintenance Checklist
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Charge battery before full depletion for longer lifespan
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Wipe down cables & motor casing after wet rides
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Check connections monthly for dirt, water, or loose fittings
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Inspect brake pads and spokes regularly on high-speed setups
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Store the battery in dry conditions between 10–25°C
