ST Coilovers for 1998-2003 BMW 528i/530i/540i/M5 [E39] 90609 90610

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Sucessfully lower your BMW E39 5 Series or M5 without braking the bank, and with a coilover system that is high quality, ST V1 Coilovers. The ST V1 Coilovers for your E39 are made by KW suspensions, the number one suspension company in the world! These coilovers feature the same features as the KW Variant 1 Coilovers at a fraction of the price, the only difference being these are made from galvanized steel whereas the KW Coilovers are made from stainless steel.

ST Variant 1

When it comes to choosing the perfect coilover, don't be cheap, do it right the first time; choose ST height adjustable Variant 1 Coilover Kits. Fully threaded shock bodies will allow you to dial in how low you want your E39 to sit, without sacrificing safety, functionality, or driving performance. All ST Coilovers are engineered with the upmost quality and performance in mind, and all ST Coilovers are German TUV approved.

ST Variant 1 Advantages
  • Matched damper and springs rates
  • Corrosion resistant zinc plated threaded strut housing
  • All around height adjustability
  • Integrated elastromeric bump stop
  • Self centering dust boot for insured durability
  • Nearly identical to KW Variant 1 Coilovers at a fraction of the price


Galvanized Steel
Coming from the makers of KW suspension systems the only main difference between the ST Variant 1 and KW Variant 1 is the steel they use. While KW uses Stainless Steel for their shock housing, ST uses Galvanized Steel. However, this does not mean a drop in quality, durability, or appearance. Although coilovers that use galvanized steel are more prone to corrosion due to environmental influences (i.e. mixture of salt water); those in the lower states: California, Texas, Florida, Nevada, etc. don't have to worry about corrosion. Those in the mid to upper States that snow still don't have much to worry about as long as they do not drive in heavy snow conditions upon where salt is used on roads. to further ensure those with doubt about Galvanized Steel, ST has corrosion resistant zinc plating on all of their threaded strut housings for further protection.

What is a Coilover?

A coilover suspension basically gives you a matched lowering spring and shock absorber combination with the added benefit of adjustable ride height and spring rates through a moveable spring perch or perches. Coilovers are to your car's advantage by reducing unsprung mass, increasing suspension travel, and allowing the car to be corner balanced.

Vehicle Model


Approx. Front Lowering (in.)

Approx. Rear Lowering (in.)

Part Number
BMW E39 5 Series 1997-2003 1.4"" - 2.6"" 1.2"" -2.4"" 90609
BMW E39 M5 2000-2003 1.4"" - 2.6"" 0.8"" - 2.0"" 90610
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