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Message: [QUOTE="leishmaa, post: 846331, member: 57020"] I have a 13 tooth front and a 50 tooth rear sprocket set-up which is still in good condition. I want to switch to a 48 tooth rear sprocket and someone told me that I need to replace the whole set-up .. front sprocket, rear sprocket, and chain. Does anyone out there know if this is true? Do you guys always change the whole set-up, or am I ok with just changing the rear sprocket. Why? thanks [/QUOTE]