One of my bikes is a first generation discover 125(almost 6yrs old), to which i have later added a set of oem alloys,17 inchers. Tyre size is same as stock.
I hear a distinct "kat" kat sound comimg from the chain area these days. To which a friend concluded the "chain sprocket" needs replacement.
So i am bit confused about the following:
1. Do i need to change both front and rear? In such cases is it the rear to give away first??

2. Can some other bike model`s sprocket be installed.I remember right from its initial days the chain needed to be tightened quite frequently.

3. Any help on indicative pricing of such parts is most welcome.



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