Join Date: Sep 2017
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Sprocket looks fine. Maintain your chain and you can get 30,000 miles out of everything (assuming you have steel rear sprocket). When the teeth get thin, or start looking like sharkfins, time to replace. BTW, you should replace chain and both sprockets at the same time (as a general rule of thumb).
As far as the indentations along the circumference, personally I've never seen a sprocket like that. But the teeth look fine. If you look along the left side of the sprocket where the chain and teeth mesh together, can you tell if the top of the teeth reach the top between each "roller". In other words, does it look like the sprocket teeth are properly gripping the chain?
Last edited by Axel Nut; 04-11-2018 at 09:03 PM.