We´re having trouble turning our robot. It doens´t turn at all, but it´s very good with full foward.
It uses the gearbox provided in the kit, and it connects the wheels with chains. The wheels sticks to the ground very well (more than the pneumatics one), and they are made of Poliuretane.
You can see a picture of it here
http://www.chiefdelphi.com/forums/sh...ad.php?t=25245
Further images can be seen at
www.repio.com.br/under/en ( Gallery )