Theory

Motor Power Ratings

Ebike motor watt ratings are almost meaningless: the same hub motor is sold as 250W, 500W, and 1000W, with no standard way to rate motor power. Here's what really determines a motor's power, and why torque and heat matter more than the number on the label.

Pedal Assist Systems

A pedal assist system (PAS) powers your ebike motor automatically as you pedal, with no throttle to hold. Learn how cadence PAS sensors and torque sensors work and how to choose. For more, our PAS Options page gives a simpler overview.