Renthal 46T Ultralight Rear Sprocket for BMW 520 Conversion 490U-520-46P-HA

Reducing unsprung weight is one of the most effective ways to improve acceleration and throttle response on your BMW. The Renthal 46T Ultralight delivers a dramatic 66% weight savings over conventional steel sprockets while maintaining the durability required for street riding. By cutting rotational mass at the rear wheel, you'll feel immediate gains in both off-the-line punch and overall handling precision.

Built from aircraft-grade 7075-T6 aluminum, this sprocket is precision CNC-machined to exacting tolerances for your specific BMW 520 conversion. The self-cleaning mud grooves engineered into each tooth prevent debris accumulation, ensuring consistent power delivery and extending service life even in demanding conditions. Installation is straightforward—a simple bolt-on upgrade that requires no fabrication or modification to your existing drivetrain.

• Material: 7075-T6 aluminum alloy
• Weight Reduction: 66% lighter than steel
• Tooth Count: 46
• Chain Size: 520
• Design: CNC-machined precision
• Self-Cleaning Grooves: Debris prevention
• Finish: Hard anodized
• Mounting: Rear, bolt-on
• Riding Style: Street
• Fitment: BMW 520 conversion specific