Shimano sora r3000 9 speed rear mechwith its durability and affordability the sora r3000 9 speed rear mech is the perfect choice for winter or urban commuting bikes now with technology adopted from higher level rear mechs both beginners and enthusiasts will feel comfortable with the features that 9 speed sora r3000 introduces features wide link design for increased rigidity and precise gear shifts 11 tooth pulleys for reduced pulley wear and chain noise pulleys feature sintered alloy bushings