Why are you replacing the entire cassette? Granted, Sunrace cassettes are pretty awful, but since it is the smallest cog that you bent (did I read your post correctly? ), then why not just replace the cog? Unless these Sunrace cassettes are different, usually the smallest cog is apart from the main cassette. This might be a good opportunity to switch from an 11 tooth to a 12, if that's what you have.