General description maXpeedingrods B1 series coilovers are designed for BMW 1 Series E81 and E87 Hatchback models from 2006 to 2012. These coilovers provide an excellent solution for those looking to replace old struts while enhancing handling performance. They feature height adjustability, allowing for a customizable ride height while maintaining OE ride quality. Technical specifications Height adjustable: Front & Rear Front Lowering: 30-85mm Rear Lowering: 30-65mm Spring Rate Front: 7 kg/mm (392 lbs/in) Spring Rate Rear: 8 kg/mm (448 lbs/in) Spring length Front: 180 mm Spring length Rear: 257 mm Spring Preload advised: 7-10 mm Damping: fixed damping Compatibility and accessories Compatible with BMW 1 Series Hatchback (E81) RWD 2006-2012 3 Door Models: 116i, 116d, 118i, 118d, 120i, 120d, 123d, 130i Compatible with BMW 1 Series Hatchback (E87) RWD 2004-2011 5 Door Models: 116i, 116d, 118i, 118d, 120i, 120d, 123d, 130i Package includes: 1 x Set of Coilover Spring Kit (2 Front + 2