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Blackspire – Enhanced profile SINGLE SPEED Chainrings for XX1Features:CNCd 7075 T-6For XX1 76BCD cranks onlyCut from .190 material for strength and long lifeFor use with 11 speed drivetrains Anodized w/Laser etched Graphics Specifications:BCD76Teeth26Material7075 T-6 AluminumSpeeds1X11CompatibilityXX1