Best Electric Bike Conversion Kits UK 2026

What Is an Electric Bike Conversion Kit?

An e-bike conversion kit allows you to electrify an existing bicycle without buying a brand new e-bike. Most kits include a hub motor wheel, battery, controller, and a display unit. Installation typically takes 1–3 hours and requires basic mechanical knowledge, though front-wheel kits are particularly straightforward.

Types of Conversion Kit

• Front hub motor kits — the simplest option. Replace the front wheel with a motorised one. Works on almost any bike with standard dropouts. Best for flat terrain and light commuting.
• Rear hub motor kits — more powerful traction and more natural handling than front-wheel kits. Slightly more complex to install. Better for hills.
• Mid-drive conversion kits — mount at the bottom bracket and use the bike's existing gearing. The most efficient and natural-feeling option, but requires compatibility with your frame's bottom bracket and is harder to install.
• Friction drive kits — a motor presses against the tyre tread to drive the wheel. Very easy to install and remove, but less efficient and wears tyres faster.

Things to Check Before Buying

Before purchasing a conversion kit, verify:

• Dropout width — most kits fit standard 100mm front or 135mm rear dropouts.
• Wheel size — kits come in 26", 27.5", 700c (28"), and 29" options.
• Brake compatibility — some kits include motor inhibitors that cut power when you brake.
• UK EAPC compliance — ensure the motor is limited to 250W and 25 km/h.

How Much Does It Cost?

Budget conversion kits start from around £100–£150 for a basic front hub setup. Mid-range kits with a reliable battery and display run £250–£500. Premium mid-drive systems can cost £600+. Compare this to a new entry-level e-bike at £800–£1,200 — a conversion kit is excellent value if you already own a quality bicycle frame.