Shimano acera m3000 top swing 9sp front mechgreat value acera dual pull multi fit front triple derailleur offering crisp performance on and off road for 9 speed drivetrains features top swing design for positive shifting action dual pull design allows it to be used with top or bottom cable routing multi fit design for 28 6 318 and 349 mm frame tubes for bike designs with 66 69 degree chainstay to seat tube angle for use with 40 tooth outer chainrings compatible with 9 speed drivetrainsa 2 ye