Product Details

• Article Number: 5481FB0008437 — Frankberg front axle coil spring set for the BMW X3 F25 standard suspension configuration. Sold as a complete pair (2 springs) — the correct replacement quantity for a front axle service.
• Set Contents: 2 × Frankberg 5481FB0008437 coil spring (one for left front, one for right front — springs are interchangeable left/right).
• Fitting Position: Front Axle — one spring installs on each side of the front axle. Always replaced as a pair to maintain balanced ride height and handling.
• Suspension: For vehicles WITHOUT sports suspension — designed for standard-comfort-suspension BMW X3 F25 models. M Sport and BMW Performance-equipped vehicles use stiffer, shorter springs with different spring rates — fitting standard springs to an M Sport vehicle will raise the ride height noticeably and alter the handling character.
• Spring Design: Coil Spring — traditional cylindrical coil spring design. The standard OEM replacement configuration, providing the linear spring rate BMW engineers specified for the F25's comfort-tuned suspension.
• Length: 383 mm — uncompressed free length of each spring. Critical dimension that determines ride height — installing an incorrect-length spring will raise or lower the front of the vehicle from its design height, affecting headlamp aim, handling balance, and tire clearance.
• Diameter: 165 mm — outer coil diameter. Must match the factory spring seat dimensions in both the upper and lower mounts to seat correctly. Note: this is larger than the rear spring (122 mm) because the front spring sits within the strut assembly.
• Wire Diameter: 13 mm — wire/coil diameter of the spring material. Determines the spring rate — thicker wire equals stiffer spring. The 13 mm spec is matched to the X3 F25's front-end weight distribution (heavier due to engine weight over the front axle).
• Colour Coding: Black — powder-coated black finish provides corrosion resistance and a clean factory appearance. BMW uses colour-coded springs from the factory to identify spring rate/vehicle variant — Frankberg's black coating matches the standard non-sport F25 variant.
• Condition: New — factory-packed in Frankberg packaging.
• Manufacturer: FRANKBERG — German-origin aftermarket parts brand distributed across Europe via Autodoc. Frankberg offers a budget-tier alternative to premium OE suppliers, with products manufactured to meet standard automotive quality requirements. Positioned as a cost-effective option for general repair work.
• OEM Cross-References: BMW 31336787134, BMW RA4009 — direct equivalents to these original BMW part numbers.
• Vehicle Compatibility: Designed for the BMW X3 (F25, 2010 onwards) and BMW X4 (F26, 2014 onwards) with standard (non-sport) suspension. Always verify against your vehicle's VIN or existing part number before purchasing — coil spring cross-compatibility varies significantly by individual vehicle options.
• Why Sold as a Pair: Coil springs should NEVER be replaced individually. A single new spring paired with an older/sagging spring creates uneven ride height, pulls the vehicle to one side, causes uneven tire wear, and compromises handling balance. This listing reflects the correct replacement quantity — one purchase = one complete front-axle coil spring job.
• Replacement Recommendation: Common failure symptoms — sagging front end (noticeable nose-down stance), uneven ride height left-to-right, or outright spring fracture (often with a loud "clunk" when going over bumps). Front springs typically last longer than rear springs but fail more dramatically when they do. A professional four-wheel alignment is MANDATORY after installation. Best practice: replace front strut assemblies AND spring pads/isolators at the same time — the labor to remove the strut is the labor to replace the spring.
• Safety Note: Front coil spring installation requires removing the complete strut assembly from the vehicle and using a heavy-duty spring compressor to unload the spring from the strut. A compressed coil spring stores substantial kinetic energy — improper handling can cause serious injury. Job MUST be done by a qualified mechanic with the right tools.
• EAN: 0754080956145

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