Without anti-roll bars on a high traction surface, a car's weight will be thrown from one side or the other as it turns (chassis roll), which can make it less controllable. The anti-roll bar ends are attached to the suspension arms and the midpoint of the bar is fixed to the bulkhead. The anti-roll bars' restriction of excessive upward arm movement stabilizes a car from excessive chassis roll. (That's why they are called anti-roll bars.)
Chassis roll creates uneven traction. How? As you turn left without anti-roll bars, the weight rolls to the right, puts pressure on the right tire, and removes pressure from the left tire. So excessive chassis roll will reduce steering control in the front, for a tire merely skimming cannot steer well.
When should you add an anti-roll bar kit to your vehicle? You should consider getting a kit if you run on a smooth surface with high traction. If your car oversteers or understeers, you should consider adding anti-roll bars to the front or rear. (Your car oversteers when the rear tires start to skid through a turn, causing a tighter turn than normal. Your car understeers when the front tires start to skid through a turn, causing a wider turn than normal.)
A car using anti-roll bars on a high traction surface will tend to have less chassis roll, make the car more responsive to cornering, and give you more control.
Anti-roll bars are generally used on smooth, high-traction conditions. Anti-roll bars on bumpy tracks don't allow your suspension to work independently, and make your vehicle difficult to drive.
When either of these two conditions are met, you should consider anti-roll bars:
a) If you are driving on a high traction track and your car oversteers, use the front anti-roll bar only. This will stiffen the front during cornering (keep the tires glued to the track), giving the car consistent steering throughout the corner.
b) If your car is understeering, try a rear anti-roll bar. This will keep the rear of the car from rolling, which in turn will transfer more weight to the front of the car, gaining steering.
Anti-roll bars can come in several configurations, depending on the vehicle. In some cases, you may have more than one anti-roll bar thickness to choose from to adjust the pressure. In other cases, a "blade" anti-roll bar will give you several tuning possibilities in one blade.
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