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Originally Posted by Cody C
The kit boxes with two CIMs served us well last year. If you are planning on getting up the ramp, then 4-wheel would be easier to do it with, plus it would give you better traction for pushing matches 
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actually, 4 wheel drive could be worse for getting on the ramp than 6 wheel drive. Depending on how you mount your wheels, the point at which you'd normally bottom out would be occupied by the middle wheels on the robot, whereas if you had a 4 wheel drive robot you'd get stuck.