The shimano 105 fc 5700 10 speed double chainset is part of shimanorsquos lightweight 105 range this innovative hollowtech forged chainset features anodised aluminium crank arms to utilise a hollow design that minimises flex and keeps the weight low the triple chainring teeth have been developed to work in conjunction with the cn 5701 chains for increased contact to provide greater efficiency and improved power transfer the hollowtech ii allows the bottom bracket bearings to be spaced wider