Hardrace Anti Roll Bar - Front 25.4mm - GR YarisHardrace Front Anti Roll Bar GR Yaris 2 way adjustable Front 25. 4mm Hollow internal structure Complete with hardened bushes Hardrace blue metallic powder coat colour Direct replacement The fitting of larger sway bars has two main effects, vehicle balance in terms of understeer and oversteer, and increased roll resistance. Both of these can provide increased overall grip levels that can be achieved by the vehicle.