🔋🚲 250W Cassette Rear Hub Motor Conversion Kit – Plug & Play • Road-Legal Mode

HG Cassette Compatible • Waterproof Wiring • 36V / 48V / 52V Compatible

Transform your bicycle into a powerful electric bike with the MCR Electric 250W Cassette Rear Hub Motor Conversion Kit. Designed for bikes with 135mm rear dropouts and HG cassette drivetrains (1–11 speed), this lightweight, compact and reliable conversion kit offers outstanding performance while remaining simple to install.

Featuring fully waterproof plug-and-play connections, a premium MTX39 wheel, colour display and high-quality components throughout, this kit is ideal for commuters, leisure riders and DIY e-bike builders.

Typical private land performance: Up to 20–25mph and approximately 15–30 miles per charge, depending on battery choice, rider weight, terrain and weather conditions.

For higher torque and increased top speed, we recommend pairing the kit with a 48V or 52V battery.

📦 What's Included

• ✔️ 250W Brushless Geared Rear Hub Motor

• ✔️ HG Cassette Freehub (Compatible with 1–11 Speed Cassettes)

• ✔️ MTX39 Lightweight Double-Wall Aluminium Rim (Black)

• ✔️ Disc Brake Compatible Wheel

• ✔️ 36 Black Stainless Steel Spokes

• ✔️ SW900 Full Colour Display

• ✔️ 17A DC Moto Controller (36V / 48V / 52V)

• ✔️ XT60 Battery Connector

• ✔️ Waterproof 3-in-1 Data Cable

• ✔️ Slimline Half-Twist Throttle with Matching Left Grip

• ✔️ VL-12 Pedal Assist Sensor (PAS)

• ✔️ Waterproof Controller Box

• ✔️ LED Headlight (Display Controlled)

• ✔️ Waterproof Motor Extension Cable

• ✔️ Tyre Levers

• ✔️ Cable Wrap

• ✔️ Cable Ties

• ✔️ Fully Waterproof Plug-and-Play Connectors

⚖️ UK Road-Legal Mode

The SW900 display features a built-in Road-Legal Mode.

Simply hold the Down button to activate.

When enabled:

• ✔️ Assistance is limited to 15.5mph (25km/h)

• ✔️ Throttle is disabled

• ✔️ Pedal Assist remains active

• ✔️ Walk Assist icon appears on the display

For use on UK public roads, the bike must comply with current UK e-bike regulations.

🔋 Battery Compatibility

Compatible with:

• ✔️ 36V Batteries

• ✔️ 48V Batteries (Recommended)

• ✔️ 52V Batteries

Battery choice affects acceleration, range and top speed.

Performance Guide

• 36V – Smooth, efficient everyday riding

• 48V – Excellent balance of power, torque and range

• 52V – Increased acceleration and improved top-end performance

This kit can be purchased on its own or paired with any compatible MCR Electric battery.

🔋 Optional Battery Bundle

Add one of our batteries for a complete plug-and-play conversion.

Example bundle includes:

• ✔️ 48V 14Ah Downtube Battery

• ✔️ 54.6V UK Charger

• ✔️ XT60 Connector

• ✔️ 2 Keys

• ✔️ Rubber Mounting Pads

Built using Grade A lithium-ion cells for reliable performance and long service life.

⚙️ Cassette Compatibility

Compatible with HG cassette systems from:

• ✔️ 1 Speed

• ✔️ 6 Speed

• ✔️ 7 Speed*

• ✔️ 8 Speed

• ✔️ 9 Speed

• ✔️ 10 Speed

• ✔️ 11 Speed

*7-speed cassettes require a 2.5mm spacer.

🛠️ Customisation Options

Prefer a full-twist throttle instead of the supplied half-twist version?

Simply leave a note when ordering and we'll swap it at no extra cost.

🔧 Installation Tips

• ✔️ Cassette tool and chain whip required

• ✔️ Ensure the axle is fully seated before tightening both 19mm axle nuts

• ✔️ Remove the transport spacer before fitting your brake disc

• ✔️ Lightly grease the cassette spline before installation

• ✔️ Remove the brake caliper for easier wheel fitting

• ✔️ Check motor phase wires are routed correctly

• ✔️ Apply thread-lock to brake rotor bolts

• ✔️ Recheck spoke tension after the first few rides

• ✔️ We strongly recommend fitting a torque arm for additional safety

🛡️ Warranty

• ✔️ 3-Month Warranty on the Conversion Kit

• ✔️ 12-Month Warranty on MCR Electric Batteries (when purchased with the kit)

Warranty excludes accidental damage, water ingress, misuse and unauthorised modifications.

🚚 Shipping

• 📦 Every kit is tested before dispatch

• 🚚 Orders dispatched within 24 hours (Monday–Friday) when ordered before 1:00 PM

• 📍 Fully tracked UK delivery

• 🚛 Courier selected based on parcel size and destination (FedEx, DPD, UPS, Parcelforce or Royal Mail)

• ⏱️ Estimated delivery: 1–2 working days

• ⭐ Weekend delivery available (additional charge)

↩️ Returns

• ✔️ 14-day returns policy

• ✔️ Items must be unused and returned complete with all supplied components and accessories

• ❗ Return postage costs are the responsibility of the buyer

🤝 Why Choose MCR Electric?

• 🇬🇧 UK-based expert support

• 🚚 Fast UK dispatch

• 🔧 Every kit tested before shipping

• ⚡ Waterproof plug-and-play wiring

• 🛠️ Premium quality components

• 🚲 Trusted by e-bike builders across the UK

• 🛒 Wide range of batteries, displays, controllers, motors and accessories available