Here's a very cool website that supposedly lists 16,755 calculators. I found it when I was looking for a woodworking calculator that would do (non-decimal) fractions. It has 30 or so cycling calculators you might find interesting (listed under sports/cycling):
http://www-sci.lib.uci.edu/
I also found that Star Trek warp speed calculator I'd been looking for...
Bob Hovey
Columbus, GA