I wrote up a SS/FG gear calculator called Rabbit. Attached are screen shots...

I'm new to the SS/FG thing so I put this together to help me understand what gearing I wanted...

Check it out: http://software.bareknucklebrigade.com/

Current Features:
- Gear Ratio
- Gain Ratio
- Gear Inches
- Development (meters)
- Skid Patches (option for ambidextrous skidding)
- Equivalent Gearing (by chainring or sprocket)
- Speed @ RPM
- Can launch as Java Applet (in browser) or with Java Web Start (allows off-line use on your machine)

New feature 03/24/2007:
- added skid patch analysis tool to help clear up confusion regarding the correct skid patch count calculation. This tool shows that Fraction's theorem is correct (http://www.bikeforums.net/showthread.php?t=242123)

Hint-of-the-day: Use the mouse-wheel for quick changes in editable fields.

If you want features added let me know...

tt