Quote:
Originally Posted by ratdude747
the only question this leaves is which is less durable, the balls or the wheels (or a tie- not durable at all)? 
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I still think the balls are still less durable since we broke all but two of our balls and never broke any of our wheels despite subjecting some of them to robot tipping tests, though it depends on how you judge it.
But back on topic, I would say just buy new ones. A whole spare set of wheels for the robot should be fine. We have 7 extras in the crate(not sure how its an odd number), which is more than that.