KirbEbike vs Swytch vs Bafang: UK Conversion Kit Comparison

These three brands solve three different problems. Swytch is the lightest, easiest wheel-swap for flat city riding. Bafang is the strongest climber, because its mid-drive works through your gears. KirbEbike covers the widest range — from the road-legal 250W EZ Rider to high-power hub kits for private land, all bundled with a battery. This comparison stays factual on all three: fit, legality, hills, range, installation and total cost, so you can pick by your route, your bike, and where you ride.

The Three Systems at a Glance

The single biggest difference is where the motor sits. That one fact drives traction, hill performance, installation difficulty and how the bike feels. Everything else follows from it.

Quick Specification Comparison

One table, the same rows for each brand. Use it to narrow the field, then read the sections below for the reasoning.

Best Kit by Rider and Use Case

Choose KirbEbike when you want a complete kit-and-battery route, more range choices, or a build that may later move beyond basic commuter power.

Choose Swytch when low weight, quick removal and simple city use matter more than torque or large battery capacity.

Choose Bafang when you regularly climb steep roads, carry cargo, or want the motor to work through the bicycle’s gears.

A flat five-mile commute doesn’t need the same system as a loaded cargo bike in a hilly town. Start with the route and the bicycle, then compare motor specifications. Choosing by brand name alone leads to extra weight, poor fit, or power you never use.

How the Three Conversion Kits Work

KirbEbike hub motor system

KirbEbike’s higher-power range mainly uses rear-hub motors. The replacement wheel contains the motor, so power reaches the rear tyre directly without passing through the chain or cassette. That gives strong acceleration and keeps motor load off your drivetrain — and a rear hub keeps working even if the chain breaks. The powered wheel is heavier than a normal wheel, so removing it for a puncture takes more effort. Note the EZ Rider is a front-wheel 250W system, so don’t assume every KirbEbike model uses the same layout.

Swytch front-hub motor system

The standard Swytch design replaces the front wheel with a 250W motor wheel. A pedal sensor detects crank movement and the controller feeds the front hub. The battery sits on the handlebar or frame, depending on model. The chain, cassette and rear wheel stay untouched, which makes fitting easy. Front-wheel pull helps gentle starts on tarmac, but on gravel, wet paint, mud or steep surfaces the front tyre can lose grip sooner than a rear or mid-drive. Swytch now offers rear motor-wheel choices on some kits, subject to wheel size and axle type.

Bafang mid-drive motor system

A Bafang mid-drive replaces the bike’s bottom bracket and crank area. The motor turns the chainring, then your rear gears decide how that force reaches the wheel. Lower gears let the motor spin faster while the bike climbs slowly — which is why a legal 250W mid-drive can feel stronger on a hill than a 250W hub motor at the same rated wattage: it borrows mechanical advantage from your gears. The weight sits low and central, which helps balance, though the motor can reduce ground clearance under the bottom bracket.

Front hub vs rear hub vs mid-drive

Biggest Strength and Trade-Off of Each Kit

Every system wins somewhere and gives something up. Here is the honest split for each — no brand does everything.

KirbEbike — built around choice

Swytch — built around portability

Bafang — built around hill climbing

UK Road Legality Compared

A standard UK electrically assisted pedal cycle (EAPC) must have working pedals, a motor rated no higher than 250W continuous, and assistance that cuts off at 15.5 mph. Meet those and you ride it like a normal bicycle — no registration, tax, insurance or licence, from age 14. Exceed them and the bike can be treated as a moped or motorcycle, which brings registration, insurance, tax, an approved helmet and the right licence.

Are KirbEbike kits UK road-legal?

The EZ Rider is a 250W system with assistance capped near 15 mph, which makes it the clear KirbEbike choice for a normal UK road conversion — provided the finished bike meets all EAPC requirements. KirbEbike also sells motors from 500W to 4000W; those are off-road / private-land only in Great Britain and should not be treated as ordinary road bicycles.

Are Swytch kits UK road-legal?

Swytch kits sold for the UK use a 250W motor and a 15.5 mph limit, and their pedal-sensing design is built around normal EAPC use. You’re still responsible for the finished bike — brakes, wheel security, wiring and required markings — and you should use the UK configuration supplied rather than unlocking settings meant for another market.

Are Bafang kits UK road-legal?

A Bafang kit can be legal when the motor is a genuine 250W version, assistance stops at 15.5 mph, and the finished bike meets EAPC rules. Bafang makes several motor families, so the logo alone doesn’t confirm legality: the BBS01B and similar 250W mid-drives are common UK choices, while BBS02 and BBSHD packages often carry higher continuous ratings that fall outside normal EAPC treatment. Check the motor label before buying — a seller’s claim that a high-power system has been “restricted” does not replace the rating printed on the motor.

The Limit Mode difference

On a KirbEbike kit paired with the Smart Controller and Ride Power App, holding the display UP button for 2–3 seconds cycles through power regimes. Most brands can only advise “please ride high-power kits on private land”; a KirbEbike rider can switch to a genuine 250W road mode in hardware. It still doesn’t change the continuous rating printed on a high-power motor, so choose a kit sold and marked as a 250W EAPC system for public roads.

Power, Torque and Hill-Climbing

KirbEbike covers the widest power span: the 250W EZ Rider through 500W, 750W, 1000W, 2000W, 3000W and 4000W systems for private land. A large rear hub drives the wheel directly for strong acceleration, and higher voltage lets it hold power under load. That output brings mass and battery demand — a 2000W or 4000W build needs a stronger bike, better brakes, torque arms and a battery that can supply the current.

Swytch works best on flat roads and moderate slopes: its 250W motor eases a hill but doesn’t gain a mid-drive’s low-gear advantage, so a heavier rider with bags may slow on a steep climb — favour a larger GO or MAX battery for hilly routes. Bafang has the clearest hill advantage: the motor drives the chainring, so you pick a low gear and keep it spinning. Shift early, ease pedal pressure through the change, and don’t start a steep climb in a high gear.

Battery Capacity, Range and Charging

The EZ Rider uses a 36V dual-battery setup, 22Ah total, with an estimated 40–60 miles — real results depend on rider weight, hills, temperature, tyre pressure and assist level. Larger KirbEbike kits pair with Taishan or HS-II batteries from 48V to 72V; available energy reaches 1,560 Wh on the 52V 30Ah HS-II pack, while the biggest packs add more than 6 kg. A large battery doesn’t guarantee long range on a high-power motor — a 4000W system drains a 1,440 Wh pack far faster than a 250W commuter.

Swytch AIR is built around a small handlebar battery — the lightest version lists roughly 7–10 miles at about 700 g. GO frame packs list about 15–60 miles by size, and MAX+ / MAX++ offer handlebar-mounted capacity up to a listed 60 miles. Bafang range is whatever battery you choose: match voltage to the exact motor and controller, and make sure the pack’s discharge rating can actually feed the motor, or you’ll get cut-outs on hills.

Installation Difficulty and Tools

Swytch is usually the easiest: replace the front wheel, fit the pedal sensor, attach the battery mount or GO bag, route the cables. A KirbEbike hub kit is close behind because the motor wheel is supplied in your size and the connectors are colour-matched — rear-hub work just adds cassette and rotor transfer, correct torque-washer orientation, and torque arms on powerful systems. Bafang is the biggest job: remove both crank arms, the chainring and the bottom bracket, pass the motor axle through the empty shell, then sort cable routing, speed-sensor alignment and chain line.

If you’re unsure of your wheel or dropout size, KirbEbike’s wheel and dropout size guide walks through how to confirm it before ordering.

Price and Total Conversion Cost

Compare the finished cost, not the motor-kit price alone. A cheap mid-drive motor can become an expensive project once you add a battery, tools, a service and brake upgrades.

KirbEbike prices span a wide range because a 250W commuter kit and a 4000W private-land build are different products. The EZ Rider is around £587.99 with its 22Ah battery, display, charger, sensors and wheel. Higher-power kits can start lower when the battery isn’t in the base price, so read the package list. Swytch pricing shifts with battery size, wheel choice and campaign timing. A Bafang build is the least predictable: a good battery adds roughly £250–£600, and professional fitting adds more again.

The KirbEbike Range, by Need

If KirbEbike is your pick, here is where each kit fits. Everything above 250W is off-road / private-land only in the UK.

KirbEbike kit	Power / legality	Best for	From
EZ Rider Kit	250W · UK road-legal	Flat-to-hilly commuting, longer range, fully reversible fit	£587.99
500W / 750W MTX	500–750W · off-road	Mixed terrain and light hills	£261.65
48V 1000W Kit	1000W · off-road	High-power riding, simpler hub install	£365.25
Z16 48V 1000W Mid Motor	1000W mid-drive · off-road	Torque-sensed hill climbing; Bafang/Tongsheng switchers	£730
52V 2000W MTX	2000W · off-road	Speed and range balance on private land	£357.85
72V 4000W Kit	4000W · off-road	Extreme trail and fat-tyre builds	£670

Which Should You Buy?

For easy installation, Swytch leads and the KirbEbike EZ Rider is close behind with more battery. For UK urban commuting, Swytch wins on weight; the EZ Rider wins if you value range. For hills and natural assist, a 250W Bafang mid-drive is the practical road choice. For power and custom builds, KirbEbike offers the broadest ladder — wheel size, voltage, controller and motor output. And for range, KirbEbike’s biggest packs go furthest, though Swytch GO/MAX now reach a listed 60 miles.

Frequently Asked Questions

The Bottom Line

Three brands, three jobs. Swytch is the best match for short urban trips, simple installation and riders who carry their bikes. Bafang is the stronger choice for regular hills, cargo and a low central motor, at the cost of more tools and more drivetrain care. KirbEbike offers the widest path between practical commuting and custom performance — the EZ Rider for UK public roads, and a full ladder of higher-power kits for private land, each bundled with a matched battery.

Before you order, confirm your wheel size, axle or bottom-bracket type, brake condition, battery space and where you’ll ride. A public-road conversion must have pedals, a motor rated no more than 250W continuous, and assistance that stops at 15.5 mph. Get those right and the best kit is simply the one that fits your bike and your route.