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Each wheel-tire combo is a flywheel. The greater the mass farthest away from the axis of rotation, the greater the energy to spin each wheel itself up to speed. Also the lower the weight of the parts controlled by the suspension, the less work for the suspension to absorb impacts. Wider tires put that wider tread area as far away from the rotational axis as possible, more power to get it going then more inertia when you slow down.
regards
Mech
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