Electric Bike Categories

Electric bikes and kits may be differentiated in several ways, such as by the Wattage of the electric drive system and how the power is activated and controlled by the rider:

A. Power.

Electric Bicycles Book

Electric Bicycles by David Henshaw and Richard Peace

Electric Bicycles covers extensively what anyone may want to know about this rapidly evolving bicycle category. The authors, David Henshaw and Richard Peace, reassuringly do know what they are writing about and tell it well. 2011. Available in our Seattle store. $27.

By law up to 750 Watt of power.

B. How power is applied and controlled by the rider:

1. Pedal Activated:

On the 'pedal activated' bike the rider engages the motor when pedaling. Here are the two ways this is accomplished, viz.:

Rotation sensing
The power system engages when it senses that the pedal crank arms rotate. All bikes listed here are 'dual mode' as well: iZip Metro, Path, Vibe & Zuma; eZee Expedir, Fantasticare, Forza, Forza EV, Quando, Sprint & Torq; eZee kits.

Torque sensing
This design senses torque, i.e. pedal pressure. The motor responds instantaneously and proportionally when you pedal: eFlow (dual mode), Giant Twist, iZip Ultra (dual mode), Stromer (dual mode), and BionX kits (dual mode).

2. Throttle operated:

The rider applies the power manually from the handle bar with a twist grip. All these bikes are dual mode as well , i.e. throttle plus pedal activation: eFlow; iZip Metro, Path, Vibe & Zuma; eZee Expedir, Fantasticare, Forza, Forza EV, Quando, Sprint & Torq; Stromer Elite. These kits are dual mode as well: BionX and eZee.

3. Dual Mode

Offers the rider the instant choice between throttle operation and pedal activation. All bikes and kits we currently offer are dual mode, except the Giant Twist, Stromer Platinum and the E-BikeKit.

The Cyclist's Electric Bike Shops Since 1996

We sell and service Human Power Augmented a.k.a. Electric bikes and ride them enthusiastically ourselves.

Visit or call

Electric & Folding Bikes Northwest
4810 17th Ave NW
Seattle, WA 98107 / Map
206/547-4621 / Contact
Virtual tour of our store


Now open 7 days a week, 11am to 6pm, to better serve our customers.

5th Annual Electric and Folding Bike Rally

Northwest Electric and Folding Bike Rally
Saturday August 12th, 12pm-5pm. LIVE MUSIC!… Test ride electric bikes! More info.

EFBNW in The Seattle Times!

EFBNW in Seattle Times


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Overview 'at a glance' and Selection Guide

Check our Overview and Selection Guide for most of our bikes and kits.