If it was 1976 I'd say its repairable... But its 2013...
If its 10 speed Chorus then it's 2008 newest .. Looking at the spare parts in 2008 the front of the body is listed as RD-CH020 from what I see
@Oswald started
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If its 10 speed Chorus then it's 2008 newest .. Looking at the spare parts in 2008 the front of the body is listed as RD-CH020 from what I see