Shimano sora r3000 9sp rear derailleurthe perfect choice for commuting on your bike all year around, the sora r3000 rear derailleur brings you the ideal mix of durability, reliability and affordability'. '.strtoupper('t')his 9 speed road bike rear mech adopts some of the same technologies seen on shimano's higher spec models, meaning new and seasoned cyclists can enjoy great shifting performance.features  speed 9 speed  compatibility all shimano 9 speed gear shifters  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 for smooth running performance  compatible with 9 speed drivetrains  cassette compatibility 9 speedmax largest sprocket 32t short cage, 34t medium cage min largest sprocket 25t short cage, 28t medium cage max smallest sprocket 14t min smallest sprocket 11tmanufacturer reference codesshort cage rdr3000ss medium cage rdr3000gsa 2 year warranty is offered with all shimano products from chain reaction cycles 3 years on dura ace and xtr products.buy shimano components from chain reaction cycles, the world's largest online bike store.