The most common are discs/tribars with weapons on them used as wheels.
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The most common are discs/tribars with weapons on them used as wheels (called crawlers).
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Although they are stronger than usual wheels and make effective damage, they have extremely low grip (get ready to be pushed) and are a slow drive system, besides being frowned upon by Some of the community.
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Although this drive system is stronger than actual wheels and make effective damage, they have extremely low grip (get ready to be pushed), phail at turning and are a (very)slow drive system, besides being frowned upon by some of the community. You've been warned.
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A bot with that drive is called a crawler. Tribar crawlers are generally not used because weaker than disc crawlers and harder to move.
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There are also walkers, reproducing a bot with legs, made with servos, burst motors or tribar (tribar crawler).
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There are also walkers, reproducing a bot with legs, made with servos or burst motors. Building a succesful walker is a respectable achievement. (Most of them still suck at fighting and there is no more weight allowance for walkers like in Battlebots)