A roll bar decreases the amount of weight transfer and side bite in the corner. If one is on the front it will limit the roll in the front and at the same time transfer some of that weight to the rear in the corner.. If both are used and are the same thickness it will help decrease roll at both ends and help eliminate traction roll. Basicly you want to put one on the opposite end that you need more body roll or side bite on in the corners on. A larger bar will lessen the roll more than a thin one. On some low traction surfaces a roll bar is not needed when you need all of the traction side bite you can get.
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