BLACK-LINE ULTRA 219 Chainring, 7075-T6 aluminum (aircraft-grade aluminum), black anodized ULTRA-hard, ULTRA-light, ULTRA-performance High-strength 7075-T6 aluminum State-of-the-art manufacturing (CNC, laser) High abrasion resistance thanks to ultra-hard anodized coating Approx. 35% lighter than standard chainrings (based on 80 teeth) Absolutely low-vibration design Special tooth geometry reduces wear 2–3 times more durable than standard chainrings Bore diameter: 135 mm Inner diameter: 115 mm
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