Be aware that using a 42 rear sprocket means that the chain gets closer to the swing arm , on the top run of the chain . So you won't wont to allow your chain to become to slack . I'm using a 44 tooth with no problems . You'll find using a 42 that your pull away won't be as fast , but your rev's will be reduced to your road speed , giving better cruising ( most noticeable in top gear ) .
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