Dinan 18-23 BMW M5 St-1 Coil-Over Suspension

Dinan's design retains the superb factory electronic shocks but swaps the springs to a more aggressive formula and implements threaded collars to allow the user to change the ride height. While a stiffer spring is typically associated with diminished ride quality Dinan has also swapped the progressive rate rear springs in favor of a much more predictable linear rate spring design. This allows for a more compliant feel while still being able to enjoy the benefits of a stiffer setup such as the reduction in body roll. The end result is a sleek lowered stance that provides improved handling to go along with its stunning visual appearance. The springs combined with progressive bump stops and other components increase travel that allows the car to be lowered an incredibly low two inches in the front and 2-1/8 inches the rear. However, in order to retain the ride quality synonymous with Dinan suspension kits the recommended drop of 1" in front and 1-18" in the rear is advised. For suspension connoisseurs or those that are just simply very particular suspension packers are included to fine-tune handling and comfort by changing the clearance of the progressive bump-stops something no respectable race car is without. F90

• Up to 2" of lowering in front and 2-1/8" of lowering in back are possible depending on tire clearance but with diminished ride quality.  Dinan recommends a 1" drop in front and a 1-1/8" drop in the rear to maintain a civilized ride.
• Helper springs are utilized in the front and rear to maintain proper suspension operation under droop conditions as well as accommodate the extensive travel of the stock shocks.
• Spring rates are 20% stiffer in front and 15% stiffer in the rear. Stock rear springs are progressive whereas the Dinan springs are linear.
• Components are machined from 6061-T6 aluminum and black anodized for a sporty appearance as well as corrosion protection.
• Included suspension packers allow adjustment of bump-stop clearance to fine-tune handling and comfort.
• Threaded collars allow easy and precise front & rear vehicle height adjustments.
• Dinan-spec progressive bump stops improve ride quality at lowered ride heights.
• Stock upper spring mounts are utilized for quiet operation.
• Substantial reduction in body roll.