SHIMANO XTR FD-M986 Dyna-Sys Traditional Front Derailleur - Double Nickel plated cage Painted inner, outer link & clamp All top-swing and traditional Shimano front derailleurs include shims to fit 28.6, 31.8, and 34.9mm seat tubes. For frames with 68 or 73mm bottom bracket sets and 135mm rear-wheel spacing unless noted All Shimano front derailleurs are dual-pull compatible