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Shimano dura ace r9100 11 speed road double chainsetthe shimano dura ace r9100 11 speed road double chainset boasts shimano's well known 4 arm hollow spider that is constructed from hollow forged aluminium'. '.strtoupper('t')his chainset has been completely redesigned to ensure it boasts the best combination of lightweight and rigid construction'. '.strtoupper('t')he chainset has been adapted by shimano to work with disc brake road bikes that have a 135mm rear hub spacing and shorter chainstays without the need to increase q factor thanks to its wider chainring spacing'. '.strtoupper('a')lthough the crank arms and spider arms are bigger, this increases overall stiffness, and the chainset has dropped 7g of weight since its previous edition.the double version offered here comes in numerous gear combinations to best suit each individual riders needs.please note a bottom bracket is not included.featuresenhanced design saves 7g while maintaining rigidityiconic 4 arm construction maintains high rigidity and reduces weightoptimised crank arm design strengthens key stress zonesnew chainring tooth profile is adapted for race bike specific disc brake systemsaccommodates shorter chainstays 410mm with 135mm old rear spacinghollowglide chainring construction maintains smooth shifting whilst reducing weight and increasing stiffnessweight 621g 53.39ta 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace and xtr products.buy shimano components from chain reaction cycles, the world's largest online bike store.