Shimano dura ace r9100 11sp band on front mechthe dura ace r9100 front mech has been redesigned to be smaller more efficient and to provide faster and crisper shifting the internal toggle mechanism provides greater clearance for larger tyres and it now features a built in cable tension adjustment bolt meaning there is no need for inline barrel adjusters features top gear teeth46 55t chainstay angle61 66 chain line435 lighter and intuitive shifting operation natural front shift lever st