Accessory Belt Tensioner Assembly

Product Details

Keep your N55 or S55-powered ultimate driving machine running at peak performance with this premium replacement automatic belt tensioner from Febi Bilstein. Whether your car is a daily driver or a track toy, the drive belt system takes a beating under high-RPM shifts and hard driving. A worn-out tensioner loses its spring rate, allowing the belt to slip, reducing alternator output, and risking a thrown belt at high speed.

Febi Bilstein is an industry-trusted German brand, known for producing OE-matching replacement parts that hold up to demanding real-world conditions. This automatic tensioner is constructed with a lightweight aluminum body and a durable composite roller pulley to ensure stable belt tracking across the entire powerband. Protect your high-revving straight-six from unexpected downtime by replacing your worn tensioner with this reliable OE-spec unit.

Key Features

• Consistent Belt Control: Maintains proper belt tracking under hard acceleration and high-RPM conditions.

• Direct OE Alternative: Matches the fit, finish, and performance of factory BMW tensioners.

• German Engineering: Manufactured by Febi Bilstein to rigid European aftermarket standards.

• Complete Assembly: Includes the cast housing, internal automatic spring mechanism, and the pulley roller.

Specifications

• Brand: Febi Bilstein

• Part Number: 49511

• Housing Material: Aluminum

• Pulley/Track Roller Material: Plastic

• Outer Diameter: 70 mm

• Pulley Width: 32 mm

• Operating Mode: Automatic

• Weight: 0.904 kg

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