Shimano dura ace r9100 compact 11 speed chainsetthe dura ace r9100 chainset is the highest level of cranks produced within the shimano road product range'. '.strtoupper('d')esigned to be light weight and stiff, this compact chainset comes with a 50 34t chainring setup ensuring you have a wide range ratio for climbing and descending.the shimano dura ace r9100 compact chainset has been completely re designed to offer the very best combination of light weight and stiffness'. '.strtoupper('i')t features shimano's iconic 4 arm hollow spider that is made from hollow forged aluminium.although the crank arms and spider arms are noticeably bigger, which increases stiffness, the overall weight has dropped by 7g over the previous edition of dura ace.the chainset has been adapted to work with disc brake road bikes that generally have 135mm rear hub spacing and shorter chainstay without the need to increase q factor thanks to its wider chainring spacing.the compact version offered here features a 50 34t chainring profile to offer an excellent rider tuned gear combination for varied conditions from flats to high mountains.please note bottom bracket is not included.features enhanced design saves 7g while maintaining rigidity iconic 4 arm construction maintains high rigidity and reduces weight optimised crank arm design strengthens key stress zones chainring tooth profile is adapted for race bike specific disc brake systems accommodates shorter chainstay 410mm with 135mm 142mm rear hub spacing hollowglide chainring construction maintains smooth shifting whilst reducing weight and increasing stiffness axle diameter 24mm bottom bracket included no weight 609g 50 34tmanufacturer reference codesblack 110mm 50 34t 170mm fcr9100c04 black 110mm 50 34t 172.5mm fcr9100d04 black 110mm 50 34t 175mm fcr9100e04black 110mm 50 34t 165mm fcr9100a04a 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.