Found a picture from when I replaced my rear sprocket a few months ago. As you can (hopefully) see, the old sprocket has lost a lot of material compared to the new one. The teeth aren’t even symmetrical anymore! As you can guess, there was a lot of chain noise lol.
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Interlocking strength in chain have improved quite a lot too.
New chain day is always exciting but not as exciting as new sprocket and chain day!
