It's been around two weeks since I bought Trek Marlin 4, 2021 and I freakin' love it. I'd like to change transmission (from 3-7 to 1-12 or 14), so what components will
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Got a Trek Marlin 4 I want to upgrade, any suggestions? : r/mountainbikes
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The Trek Marlin 4 | A Quality Entry Level Mountain Bike - YouTube