This is the wide link design Shimano Deore M610 Triple 10-Speed Multi Fit Front Derailleur. It is a top swing, dual pull, wide pivot link design for greater torsional rigidity which improves shifting response & service life. The Multi Fit mounting system means that you can set it up perfectly every time what every the diameter your seat tube. This Deore M610 front derailleur is compatible with Dyna-Sys 10-speed MTB drivetrain & bike with a 66 to 69 degree chainstays angle.