Shimano slx m661 conventional 3x10 front mech features tough aggressive and light weight all mountain direct fit front derailleur dual pull design for use with top or bottom cable routing direct frame fit for easy and accurate installation giving perfect alignment wider pivot link increases torsional rigidity easy access angled adjustment screws angled inner chain guide tail for increased tyre clearance specifically developed for 68 and 73 mm bottom bracket shells with a 50 mm chain line 66 69