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Does the chain ring it needs replacing too?
I bought a Fuji Sportif second hand earlier this year. Thought it was alright but now I'm not so sure. The only shimano components are the shifters, brakes and derailleurs. Cassette, chain, bb, cranks and chain rings are all different brands. The gears are not working well so I decided to buy a new chain and cassette (it had a fucking sunrace cassette on it btw) but just noticed the chainrings also look very worn.
Also is there a standard for chain ring mounting. Looks like I can remove them with an Allen key.