maXpeedingrods Coilovers for Kia Optima 2011 2012 2013 2014 2015, Height Adjustable Coilovers Suspension Kit Strut, Complete Assemblies Coil Spring Shock Absorber, Amortiguador Lowering Kits Gold

【Application】 The coilovers set is fit for Kia Optima 2011 2012 2013 2014 2015 【Spring Rate】 Spring rate front:9kg/mm(504 lbs/in)& Spring rate rear: 7.5kg/mm (420 lbs/in). Hi Tensile performance spring - Under 600,000 times continuously test, the spring distortion is less than 0.04%. Plus, the special surface treatment is to improve the durability and performance 【Spring Rate】 Spring rate front:9kg/mm(504 lbs/in)& Spring rate rear: 7.5kg/mm (420 lbs/in). Hi Tensile performance spring - Under 600,000 times continuously test, the spring distortion is less than 0.04%. Plus, the special surface treatment is to improve the durability and performance 【Twin-tube Structure】 Compared to mono-tube construction, the twin-tube has longer stroke and higher height adjustability, and they will give you a more comfortable riding experience by reducing the pressure on the joints and also minimizing friction and ensuring sufficient travel with less effort 【Excellent Material】The product comes with 6061 aluminum alloy with T6 for increased hardness, high quality precision parts, high strength and durability. It is fully loaded and safe for installation