Bicycle Gear Head

Formerly brought to you by TheDoty.com

Bicycle Gear Head was the most comprehensive bicycle gear calculator for the iPhone, but is no longer being sold or maintained by The Doty. This page remains to provide some instructions for any of ya'all who may already have it.

Video Introduction and Instructions

Features

Generate a beautiful custom results table in seconds that can be shown to customers, sent in an email, or displayed on a web page.

Adjustable:

Wheel Size
Crank Length
Chainrings
Sprockets
Pre-made cassettes or custom

Results Show:

Gear Inches
Gain Ratio
Meters Development
MPH at 60, 70, 80, 90, 100, 110, and 120 RPM
KPH at 60, 70, 80, 90, 100, 110, and 120 RPM

Screen Shots

bicycle gear head gear calculator entry screen

bicycle gear head gear calculator gear inches

bicycle gear head gear calculator entry screen custom sprocket

bicycle gear head gear calculator gain ratio

bicycle gear head gear calculator kph metric