The shimano 6703 ultegra 10 speed hollowtech ii triple chainset offers an ideal balance of light weight and stiffness making it the perfect choice for both enthusiast and competitive riders a hollowglide hollow outer chainring gives vast improvements in rigidity by virtually removing outer chainring flex and hugely improves shift performance even under high load the chainring teeth have been developed to work in conjunction with the cn7900 and cn6700 chains for increased contact to provide g