Rowland Cook

Cyculator - The Cyclists calculator.This software contains 3 formulas that are useful to cyclists.1) Gear ratio calculator (in inches)2) Spoke length …

The application displays measurements (In feet, Inches and Meters) between any two selected points on a Roller derby Track.It displays a Roller Derby …

This application contains videos of the current Roller Derby Referee hand signals as of 1st Jan 2013.There are three ways to view a hand signal.1) Sel …