Sway Bar BMW E85 Z4 improve your car Handling & Stability. Also known as a Rear Anti-Roll Bar, Rear Sway Bar, Rear Stabilizer Bar. Greatly reduce body roll and high stability in cornering. Neutralize UNDERSTEER.

Specification: 21mm Solid with Polyurethane Bushing
Remarks: Only for BMW E85 Z4 2.5 (2002)

The front wheels are likely to slip towards outside of the turn angle, driver can solve it by turning a little more slightly but the handling is reduced, vehicle’s behavior is less predictable and tires are likely to worn out faster. Understeer often occurs in front wheel drive layout vehicles. As most modern cars go, car manufacturers employ the FF (Front engine, Front wheel drive) setup for improving driver and passenger safety. The natural behavior of an FF car is to have a slight understeer, due to its heavier front end. Understeer happens when the front wheels lose their traction and won’t turn any sharper, even when the steering is being corrected to turn the car more. This will cause the car to go wide instead of following the line. Understeer can be corrected by stiffening the rear end of the vehicle by adding a Rear Strut Bar and a Rear Anti Roll Bar.

Life and safety is more important than everything. For daily road user, we are friendly recommended you to install our STAGE 1 Package.

STAGE 1 : Front Strut Bar, Rear Anti-roll Bar and Front Lower Bar

Front Strut Bar is to strengthen your car chassis and both side shock of impact will be neutralized.

Rear Anti-roll Bar will be more effectively preventing the car sway a side at cornering, greatly reduce body roll and high stability in cornering.

Front Lower Bar stabilize the car and provide solid handling while entering in the corner, and neutralize shock of impact transfer to the chassis.

The forces acting on the car BMW E85 Z4 when cornering. Front and back view.

When any of the wheels loses contact with the road surface, there will be a deviate in handling; each of the suspension system should keep all wheels on the road surface in spite of hard cornering and in change of steering position. It’s always pleasing that that car can be set for a tiny amount of understeer so that it responds predictably to a turn of a steering wheel and the rear wheels to have a smaller dip angle than the front wheels. However this may not be achievable at all times due to the vehicle load, road condition, weather, speed and this consumes excessive time for the driver to adopt.

BEFORE install Ultra Racing’s anti roll bar on car BMW E85 Z4: When turning in corner, the weight transfer will make the car sway a side, causing body roll and more difficult to turn in to a corner, weaken the steering respond.

AFTER install Ultra Racing’s anti roll bar on car BMW E85 Z4: The upgrade version of Ultra Racing’s anti roll bar will be more effectively preventing the car sway a side at cornering, greatly reduce body roll and high stability in cornering.

Test cars with installed Ultra Racing’s Front Strut Bar and Rear Anti-roll Bar and without.

Movie of installation of the Ultra Racing’s Rear Anti-roll Bar.