Shimano ultegra 6700 double 10sp chainset greylightweight 10 speed cassette with rigid alloy sprocket carrier for reduced weight and better shifting performance even under the most demanding gear changes the hollowtech ii 10 speed ultegra chainset offers an ideal balance of light weight and stiffness making it the perfect choice for both enthusiast and competitive ridersplease note bottom bracket is not included features hollowglide hollow outer chainring gives vast improvements in rigidity