Fortunately I found the drivetrain sitting around for some reason: http://puu.sh/7i6ob/b582d09b20.JPG

It is in the following arrangement (numbers indicate teeth count, P indicates powered, W indicates wheel attached, all are the double bevel gears(forgot what they were called))

12W-20-12-20-12-20-12W,P-36-12-20-12W



Or in ratios with base 12:

1W-1.66-1-1.66-1-1.66-1W,P-36-1-1.66-1W



It was mainly designed that way to have a large base and surface area. At the time, my robots trended towards lower to the ground, compact, and not very tall.