H&R 60mm ID Single Race Spring Length 100mm Spring Rate 280 N/mm or 1598 lbs/inch - RF100280 fits_2002-2008`BMW`7 Series The air springs are built

The air springs are built like tires

ADJUSTMENT FEATURES

Up to 6HP and 9ft-lbs torque gains

Compatible with all submodels

Not compatible with OEM electronic damping equipped vehicles

H&R 60mm ID Single Race Spring Length 100mm Spring Rate 280 N/mm or 1598 lbs/inch - RF100280 fits_2002-2008`BMW`7 Series The air springs are builtH&R 2. 50" I. D. Race Springs are made with extremely high tensile strength wire alloy which allows the use of a thinner wire. Manufactured using advanced materials and precision technology in Germany, H&R 2. 50" I. D. Race Springs are crafted from special lightweight (hf) 54SiCr6 spring steel. For any given spring rate, they are on average 15% lighter and have 10% more travel than competitors' springs. Main springs range from 6" to 18" in length and