HappyRun Electric Bicycle Hub

HappyRun 250W Front Hub Motor (Brushless)

A compact, reliable front hub motor that adds smooth, quiet electric assist to your bike. Designed for daily commuting and light touring, it installs quickly, preserves your bike’s handling, and lets you ride farther and with less effort in varied weather.

Benefits

• Make starts and low-speed climbs easier so you arrive less tired and ready for the day.
• Quieter operation reduces drivetrain noise for a more comfortable, less distracting ride.
• Front-wheel mounting keeps weight distribution predictable for stable steering and confident handling.
• Simple retrofit to many bikes saves time compared with rebuilding wheels or modifying the frame.
• Water- and dust-resistant design means you can ride in light rain or dusty conditions with greater confidence.
• Sealed construction reduces routine maintenance, letting you spend more time riding and less on upkeep.

Features

• Brushless DC front hub motor that delivers smooth, consistent assist.
• Integrated hall sensors for responsive throttle and pedal-assist control.
• Standard 100 mm axle spacing for straightforward installation into most front forks.
• 6-bolt disc rotor mount for compatibility with common disc brake systems.
• Sealed aluminum-alloy housing to protect internals and help dissipate heat.
• Waterproof multi-pin connector and approximately 120 cm cable for flexible routing.
• Available in common spoke-hole counts and rim diameters to fit many wheel builds.

Specifications

• Rated power: 250 W (nominal)
• Rated voltage: 36 V
• Maximum torque: ~35 Nm
• Top assist speed: 25 km/h (typical, set by controller/regulations)
• Wheel compatibility: common rim diameters including 26", 27.5" (650B), and 700c
• Axle spacing: 100 mm (front standard)
• Spoke holes: 32H or 36H options
• Rotor mount: 6-bolt disc
• Weight: approximately 2.8 kg
• Housing material: aluminum alloy (sealed)
• Integrated sensors: Hall-effect sensors included
• Cable length: ~120 cm with waterproof multi-pin connector
• Ingress protection: IP65
• Operating temperature: -20 °C to 60 °C
• Includes: front hub motor, axle hardware, dust caps (controller and display sold separately)