My Rumblefish has the HG61 rear cassette (I am a noob when it comes to cassettes). Is it possible to replace my 12t cog with an 11t cog or do I need to replace the cassette? I am looking to do this in conjunction with changing my front rings from 22/32 to 24/36. Thanks!
Mtbr's 2016 Winter Biking GearReviews and Roundups
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