There are three important factors that define how a wheel is Which wheels should you use? I particularly used the pololu wheels because they are prepared specially for this motors. What about only two 1:10 motors? This can work too, but the robot takes more time to accelerate, what is bad itself but doesn't make it a bad idea. With four 10:1 motors the robot can go really fast with no more than 6.5v. So the decision is between 30:1 or 10:1, I particularly used four 10:1 motors, because using four motors means the robot can handle curves better ,but, a robot with only two 30:1 motors can work also although you'll need maybe to give them more than 6v to achieve higher speeds. I don't recommend using nothing more than 30:1 gear ratio because you won't be able to do a fast robot that is our objective (however, you need to make your robot weight less than 250 gr), and nothing less than 10:1, because they could be incredible fast motors but they are not able to deal with curves (because of the weight of the motors themselves and the inertia that this generates). Which gear ratio should you choose? A higher gear ratio means lower-speed but higher torque what involves higher acceleration, even instant acceleration with even heavy robots. I actually used the high-power motors for this robot because I don't want to risk breaking my motors.They can work for several hours of continued usage without breaking though (some old robots with these kind of motors have worked for 3 years and more, and still hasn't broken) The difference between the high-power and high-power-long life is that the long life have a longer lifetime but they can't bear giving them more than 6v and heavy stalling, while the high-power motors can deal with these conditions better. I only used the high-power motors, and high-power-long life and I can tell you they don't consume too much. I particularly don't recommend using this kind of motors that are made for other proposes rather that high performance competitions. Which is the difference? The lower-power ones consume less power, but this means a worse motor because we'll have less speed or less force. Pololu offers us four kind of motors, low-power, medium-power, high-power, and long-life-high-power (all of them work at 6v and have the same physical dimensions). Here comes the most important decision that is which motors and which wheels to use. Pololu is a website from Nevada-US that offers different kind of robots accessories, even entire robots (but normally line follower competitions forbid using them). There are plenty different types of these, but if you're a beginner I recommend using the ones pololu sells to you. To make the robot you'll need both wheels and motors.
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