There is a good discussion going on the forum (http://ift.tt/1BZxQJk) about different drive motors and how they could potentially be used to achieve 4WD so this video I recorded a few weeks ago comparing the normal motors seems fitting. In this one I compare the two Siku drive motors to the Tamiya 4 speed and 12 speed motors. I first do a small comparison of the motor dimension and then put together a Frankenstein’s tractor to test their power using a luggage weighing scale for comparison.

The Siku motor dimensions are here: http://ift.tt/1xB8axl

The Tamiya 70189 speed motor dimensions are here: http://ift.tt/1BZxQJq

The Tamiya 70190 12 speed motor dimensions are here: http://ift.tt/1xB8axp