Tegiwa Roll Centre Adjuster Ball Joints Civic Type R EP3 01-06TEGIWA Roll Centre Adjusters. When a car is lowered, the angle of the lower arm becomes poor, resulting in a significantly lowered roll center. Consequently, the amount of roll in corners increase and the cornering force is sacrificed. By extending the ball joint of the front knuckle, the position of the roll center is altered. Replacing the stock ball joint with this product will result in reduced roll, and cornering force as a result is increased.