Zimmermann 34-21-6-763-827 Rear Brake Disc 345x24mm Externally Vented

The Zimmermann 34-21-6-763-827 is a precision-engineered rear brake disc designed to deliver OE-quality performance and reliability. This externally vented, two-piece brake rotor features an aluminum brake disc hub for reduced unsprung weight and optimal heat dissipation.

Key Specifications:

• Outside Diameter: 345mm (13.58 inches)
• Thickness: 24mm
• Height: 63mm
• Bolt Pattern: 6/5 holes, 5x120mm bolt circle
• Hub Bore Diameter: 75mm
• Externally vented design for superior cooling
• Two-piece construction with aluminum hub
• Perforated/drilled design available for enhanced heat dissipation

Premium Construction:

• Manufactured in Germany to stringent OE specifications
• High-carbon grey cast iron construction for excellent wear and thermal resistance
• Material composition matches original equipment specifications including copper, molybdenum, titanium and carbon
• Precision-machined surfaces ensure optimal pad contact and reduced brake noise
• Quality management certified to DIN EN ISO 9001 and ISO TS 16949 standards

Zimmermann has been a trusted OE supplier to German automotive manufacturers including BMW, Porsche, and Mercedes-Benz for over five decades. This brake disc is engineered to meet or exceed original equipment performance standards, providing reliable stopping power and long service life. The externally vented design promotes efficient heat dissipation during demanding driving conditions, while the two-piece construction with aluminum hub reduces rotational mass for improved handling response.

OEM Cross-Reference: BMW 34216763827

Important: Proper bedding-in procedure is recommended after installation for optimal performance. This rotor is designed for vehicles equipped with the high-speed brake system upgrade. Please verify rotor dimensions before ordering to ensure proper fitment.