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Well I guess we don't have a totally great answer for why except that when we used them on the front the robot steered 'about' the rear wheels which made it hard to grab the goals last year.
When they were on the rear wheels the robot spun about the front wheels similar to a fork truck.
We also tried them on all four wheels and the robot spun about its center but it didn't have as much pushing force as dedicated traction wheels on two of the four.
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