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Fluidity, smoothness, and noise reduction: the 5.5mm Chorus? chain fully meets the quality and performance standards of the 11-speed? groupsets. The strength of the treated steel links is absolute, and the Ultra-Link? closure system guarantees safety and the long life of the chain. **Technical Specifications:** * width 5.5 millimetres * Ultra-Link? fastening system * external links in special new steel * Ni-PTFE anti-friction treatment * 2.24g /per link