Rear Derailleur RD-TY21B 6/7 Speed Hanger Mount for Mountain Bike Specification : * Model: RD-TY21B * Mount Type：Hanger Mount * Color: Black * Weight: 0.3KG Feature: * RD-TY21B rear derailleur compatible with 6/7 speed transmission system. * With aluminum alloy material,strong and sturdy. * Simple design, convenient to use. * Excellent shifting performance ensure safe and stable riding. * Suitable for MTB,mountain bikes, road bikes, variable speed bikes and so on. * NOTE:RD-TY21B rear derailleur is hanger mount,Please check the mount type of the original part before purchasing.