The shimano ultegra cn6600 chain is recommended for the current ultegra fc6703 triple chainset the chamfered inner plates optimise shifting performance on hg sprockets a chromising treatment on link pins and heat treated rollers pins and plates ensure the durability and strength of this bike chain with mushroomed pins for unsurpassed side plate retention allowing the chain to exceed the bsiso standard this 10 speed compatible bike chain has a 588 mm chain width fully optimised for 10 sp