Great value front derailleur that delivers accurate and low friction shifting for multi fit dual pull and top swing with the use of included adapters the derailleur can be mounted to any size seat tube compatible with 67 speed drivetrains top swing dual pull design is light action and compatible with either top or bottom pull frames for use on mtb style bikes with 66 to 69 degree seat tube to chainstay angle developed to work with 42 tooth outer chainring