**Gear Ratios**

- Free Ride Gear Ratios Applet (Grades 6-8, 9-12)

Interactive applet that promotes understanding of bicycle gear ratios.*National Council of Teachers of Mathematics*. - Gears and Proportions Activity (Grades 5-8)

Lesson that includes a video, handouts, and assessment materials based around bicycle gears and their proportions.*PBS Learning*. - Ratios and Circumference in Bicycle Gears (Grades 7-9)

*Teacherknowledge.net.* - Bicycle: A Well-Engineered Machine (Grades 7-9)

Activity, complete with handouts, that highlights the mechanical advantages of a ten-speed bicycle.*Glencoe/McGraw Hill.* - Drives & Gears (Grades 7-9)

An introduction to bicycle gears. Includes a hands-on activity with spools of thread (click “forward on the top of the page).*Exploratorium, Sports Science.* - What are gears? What do they do? (Grades 4-8, but adaptable)

This lesson utilizes Lego Mindstorms robotics components to demonstrate gear ratios.*Teach Engineering.* - Mathematical Impressions: The Bicycle Pulling Puzzle

An seemingly simple, yet complex, problem.*George Heart, Simons Foundation.*

**Geometry of Bicycle Frames**

- The Geometry of Bicycle Designs (Grades 3-5, but adaptable)

Measurement-based activity based around various components of a bicycle frame.*PBS Learning.* - Bicycle Frame Calculator

Web-based applet that allows you to adjust the geometry of a bicycle frame and shows those changes graphically. - Bicycle Frame Comparing Tool

Comprehensive Excel spreadsheet that allows you to graphically compare the geometry of two different bicycles.

**Bicycle Wheels & Tires**

- The Bicycle Wheel, Explained

The history and science behind this masterpiece of engineering. - Millimeters vs. Inches vs. ISO

Sheldon Brown compares the various standard measurements for bicycle wheels and tires. - A Bicycle Wheel Supports a Car

Wheel builder Bill Mould shows how a bicycle wheel can support a car.

**Personal Health & Fitness**

- Cycling Calorie Burned Calculator

Enter a few bits of information and Bicycling Magazine provides an estimate of calories burned. - Bicycling Drafting: Fact or Fiction?

Does drafting help cyclists save energy?*Mythbusters.* - The Sweet Science of Pedaling Cadence

What is it? How does it effect how we ride?

**ELA & Social Studies**

- Do Bike Lanes Gentrify Neighborhoods?
- Contested Streets: Breaking New York City Gridlock
- The Search for the Zozo

A streetfilm about how cars helped to eliminate large, furry, innocent creatures.

**Further Reading**

- The Bicycle as a System (Grades 7-9)

Complete lesson directed more towards science that explores how the systems of a bicycle enable it to function.*AAAS Science NetLinks.* - Geometry of Bicycle Handling

A technical explanation of how the geometry of a bicycle effects handling. - Mathematical Impressions: Bicycle Tracks

Another mathematical puzzle. Which direction was the bicycle going? You can tell by examining its tracks.*George Heart, Simons Foundation.* - We Still Don’t Really Know How Bicycles Work

Michael Brooks discusses the mystery behind bicycle dynamics.*New Statesman.*

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