Product Details

AST Lowering Springs for the 2009-2018 BMW Z4 Roadster 18i/20i/23i/28i/30i RWD (E89) are manufactured from a premium high tensile chromium-silicone wire which is handpicked by AST engineers for its quality and metal consistency.

Each spring is cold wound and then heat treated to increase hardness and reduce internal stresses present after winding. Each spring is then individually shot peened, phosphate treated and then powder coated to outlast even the life of the vehicle.

Standard Features

  • Progressive rates on most vehicles.
  • EDC Compatible (if applicable to vehicle)
  • Each spring is blocked and computer tested prior to shipping, which reduces any settling once installed on the vehicle.
  • Lifetime warranty on breaking.
  • Most of our spring applications are TUV Certified and certificates can be provided upon request.
Specifications
Part Number ASTLS-14-473
Part Name Lowering Spring
Vehicle 2009-2018 BMW Z4 Roadster 18i/20i/23i/28i/30i RWD
Chassis Code E89
Ride-Height Adjustable No
Spring Type Progressive
Approximate Drop - Front 30mm
Approximate Drop - Rear 25mm
TUV Certified Yes
Quantity Set of 4
Notes For cars with standard lowering, the indicated lowering will be reduced with the amount of the standard lowering.
Vehicle Fitment
  • 2009 BMW Z4 Roadster 18i/20i/23i/28i/30i RWD (E89)
  • 2010 BMW Z4 Roadster 18i/20i/23i/28i/30i RWD (E89)
  • 2011 BMW Z4 Roadster 18i/20i/23i/28i/30i RWD (E89)
  • 2012 BMW Z4 Roadster 18i/20i/23i/28i/30i RWD (E89)
  • 2013 BMW Z4 Roadster 18i/20i/23i/28i/30i RWD (E89)
  • 2014 BMW Z4 Roadster 18i/20i/23i/28i/30i RWD (E89)
  • 2015 BMW Z4 Roadster 18i/20i/23i/28i/30i RWD (E89)
  • 2016 BMW Z4 Roadster 18i/20i/23i/28i/30i RWD (E89)
  • 2017 BMW Z4 Roadster 18i/20i/23i/28i/30i RWD (E89)
  • 2018 BMW Z4 Roadster 18i/20i/23i/28i/30i RWD (E89)

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