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Originally Posted by Tom Bottiglieri
As has been stated before, designs are just as complicated and efficient as you make them. In my teams case, we have been successful with treads. Other teams have been successful with 6 wheel drive. I dont believe either one is "better". Tytus brings up a good point. In his Lego league team's undertakings, 6 wheel drive has been superior to the treads. This is not because treads are a horrible idea and 6 wheel drive is much better, it is simply because that teams design and method of construction may have been flawed.
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and also in the case of lego, most tires you would want to use have flat surfaces. the rubber lego tread has a taper (is that what you call it?) on the sides, so it will turn better on carpet but on hard surfaces will not help the tread stay flat to the floor. the some lego tires are wide too. which have more scrub when turning so helps keep the robot move in a straight line.