Found what you're looking for: http://www.vexrobotics.com/products/...hdwr-dual.html

Looks good, but how far apart are the sprockets spaced? They need to be the same space away from each other as the ones from AndyMark are.

Plus, it's for a CIMple box output shaft, so they'll need to fit there on the key bore and everything.

EDIT: I did the math (Haven't saved the world yet, build hasn't started), and found out that if I use smaller sprockets on the wheels, I can get the preferred speed. So since I also can't find any wheel-mountable sprockets smaller than 22 teeth, does anyone here know of any smaller sprockets that are also wheel-mountable? This should be easier to find then the double sprockets.