Replace or upgrade your worn chain and sprockets with this market leading sprocket kit featuring quality JT Sprockets and D.I.D chain brought to you by THS Moto. Note the chain may need to be adjusted to length using a chain breaker tool. This Sprocket Kit contains a 17 tooth front JT sprocket and 45 tooth rear JT sprocket with a 525ZVMX120G 120-Link 525ZVM-Gold X-Ring rivet link DID Chain Fits: BMW S1000RR 2012-2021