While the 1 and 3 Series models are now provided from the factory with a significant range of camber adjustment the Dinan camber plates shift the range of the adjuster by -0.7 degrees providing for a more aggressive negative camber setting that dramatically improves grip in the turns. There's really no reason to install an adjustable type camber plate as the adjustment is already provided by BMW and then enhanced by Dinan. The Dinan camber plates retain the factory bushings eliminating negative effects on ride quality or the introduction of annoying noises that are common with adjustable camber plates.