{"product_id":"bilstein-21-031199-suspension-strut-cartridge-front","title":"Bilstein 21-031199 Suspension Strut Cartridge - Front","description":"\u003ch2\u003eReliable Suspension Strut Cartridge for BMW Models\u003c\/h2\u003e\u003cp\u003eThe Bilstein B4 OE Replacement Suspension Strut Cartridge 21-031199 is engineered to restore the original ride quality and handling of your BMW 525i, 530i, 535i, or 540i. Designed with precision, this strut cartridge offers a direct fit and dependable performance for your vehicle's suspension system.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eBrand: Bilstein\u003c\/li\u003e\n\u003cli\u003eBrand Line: B4 OE Replacement\u003c\/li\u003e\n\u003cli\u003ePart Number: 21-031199\u003c\/li\u003e\n\u003cli\u003eCategory: Suspension Strut Cartridge\u003c\/li\u003e\n\u003cli\u003eFinish: Durable black paint\u003c\/li\u003e\n\u003cli\u003eInternal Design: Twintube technology\u003c\/li\u003e\n\u003cli\u003eLower Mount Type: Base cup\u003c\/li\u003e\n\u003cli\u003eUpper Mount Type: Stem\u003c\/li\u003e\n\u003cli\u003eBoot Included: No\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eAbout the Bilstein B4 OE Replacement Product Line\u003c\/h2\u003e\u003cp\u003eThe B4 OE Replacement line by Bilstein is designed to meet or exceed original equipment specifications, providing a reliable and cost-effective solution for restoring your vehicle's suspension. This product line focuses on delivering consistent damping performance and durability, making it suitable for BMW owners seeking to maintain factory ride characteristics without compromising quality.\u003c\/p\u003e\u003ch2\u003eProduct Features and Technical Details\u003c\/h2\u003e\u003cp\u003eThis Bilstein suspension strut cartridge features a twintube internal design that ensures smooth and controlled damping, improving ride comfort and vehicle stability. The black paint finish offers corrosion resistance, extending the service life of the strut. The base cup lower mount and stem upper mount provide a secure and precise fitment, specifically engineered for BMW 525i, 530i, 535i, and 540i models. Note that this strut cartridge does not include a boot.\u003c\/p\u003e\u003ch2\u003eCommon Suspension Issues Addressed\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eReduced ride comfort due to worn or damaged struts\u003c\/li\u003e\n\u003cli\u003eExcessive body roll or instability during cornering\u003c\/li\u003e\n\u003cli\u003eUneven tire wear caused by suspension imbalance\u003c\/li\u003e\n\u003cli\u003eNoise or vibration from faulty suspension components\u003c\/li\u003e\n\u003cli\u003eLoss of vehicle control on rough or uneven roads\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eInstallation of the Bilstein 21-031199 suspension strut cartridge should be performed by a qualified technician familiar with BMW suspension systems. Ensure the vehicle is properly supported and follow manufacturer torque specifications for mounting hardware. Since the boot is not included, inspect the existing boot and replace if necessary to protect the strut from dirt and debris.\u003c\/p\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eBilstein manufactures this suspension strut cartridge to meet strict quality standards, ensuring reliable performance and durability. The B4 OE Replacement series is engineered to match original equipment specifications. Please refer to Bilstein's official warranty policy for detailed coverage information.\u003c\/p\u003e","brand":"Bilstein","offers":[{"title":"Default Title","offer_id":51955746963637,"sku":"BBGL-21-031199","price":114.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/B5_21031199_Fro.jpg?v=1775061574","url":"https:\/\/www.partcatalog.com\/products\/bilstein-21-031199-suspension-strut-cartridge-front","provider":"PartCatalog","version":"1.0","type":"link"}