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Discussion Starter · #1 ·
Recently I've changed my Sprocket to a nine speed cassete from the seven one...

Should I change my chain ? The new sprocket is ultegra 9 speed..
Since if I use the 18 teeth sprocket, the Rear deraileur becomes unstable...I felt disturbing while cycling because of it..

Anyone know or ever had this problem ? and what's the solution ?

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