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'. '.strtoupper('t')he 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 teeth 46 55t chainstay angle 61 66 chain line 43.5 lighter and intuitive shifting operation natural front shift lever stroke more ergonomic power curve precise easy front derailleur set up more cable routing options integrated cable tension adjustment new link toggle construction means there is no need for tl fd90 and turning converter assembling adjustable cable tension on the front derailleur adapted for race specific frame design available wider front gear pitch shorter length of rear centre with o.l.d.135mm weight 69ga 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.