Modern Robotics Inc. (Matrix Robotics) hasn't published specs for the Matrix 12V gear-motor. I like this motor a lot with the planetary gears, which are typically more efficient and durable than the spur gears used by AndyMark and Tetrix. I did some preliminary testing and posted results here:
http://www.chiefdelphi.com/forums/sh...61&postcount=7 with a drawing of dimensions.
