Shimano 11 speed 5800 hg600 105 chain super narrow lightweight 11 speed hg ev symmetrical design chain for smooth shifts and maximum durability outer plate design has been developed to reduce the chance of chain suck sil tec surface treatment technology ptfe plating on inner links that is smooth running and increases durability the inner plate has been developed for better contact with gears providing smoother shifting under high load giving efficient pedalling increased rigidity and near