Re: Wiered sound from sprockets

Topic Approved.


Please clarify what kind of noise, whether the noise is,

a running operation noise (grrrrrrrrr)
or a regular striking noise (kit.... kit.... kit.... )
or an irregular noise (......... thak..... kit..thak..........thak)


Chain noise may have various reasons. I'll touch upon the most basic ones:-

1. (I know you said you tested chain slackness, but you didn't mention how you checked)
Try moving the lower part of your chain up and down with your fingers. If you're able to move it by about 4 cms, then your chain is correctly adjusted.
If you can't move it by at least 4 cms, then your chain is too tight. Get it loosened.
Similarly, if you can move it by more than 5-6 cms, then it is too loose. Get it tightened.


2. Verify the chain for "frozen links".
Move the wheel slowly on main stand and see unusual links which do not flex, which are stuck as they are, even when the chain is in motion.
See the image below to understand how the chain remains bent even on movement...




Please answer the above questions while quoting me, then I'll assist you further... Any more info would also be welcome.

Re: Wiered sound from sprockets

How old is the bike? Remember that even on low-horsepower bikes the sprockets wear, especially if you ride in dusty/muddy conditions and don't regularly clean everything. If either sprocket is worn, the chain could be getting hung up on it and having trouble lifting out of the teeth. It's generally more noticeable when it's the front sprocket due to the smaller diameter.