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The Doorstop as a Wedge: Why a Small Taper Holds a Door A Bottle Opener and the Leverage Behind Its Handle Bicycle Gear Ratios: How Teeth, Rotation and Direction Relate The Pulley at a Window Blind: Guiding a Cord Around a Wheel Why a Screw Holds: Threads, Contact, and Turning Force

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Gears

Explore how toothed wheels connect movement, speed, and direction.

GearsOct 12, 20265 min read

Bicycle Gear Ratios: How Teeth, Rotation and Direction Relate

Bicycle gear ratios make tooth counts easier to interpret: see how chainrings and sprockets relate to turns, direction and the feel of a chosen gear.