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Bigger tires turn big bumps into little bumps. You can demonstrate this yourself by playing with toy cars - a car with larger wheels can negotiate bigger obstacles than a toy car with smaller wheels.
So why don't we all have 54" tires? Big tires are not so good for handling and can increase the chances of a rollover. They also require more power to turn. This is not a knock on big tires, just understand that, like anything, there are advantages and disadvantages to fitting them.
Big tires also mean more wear on suspension components, bearings, etc. so make sure that yours are in order.
Further, if you get anything bigger than 33", you should also consider getting numerically higher differential gears to compensate. The bigger the tires, the more compensation is needed.
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