2020 Trek Marlin 4 Mountain Bike - bicycles - by owner - bike sale - craigslist
TREK - Marlin 4 - GEN 2 - L 29 - Alpine Blue - Tommy's Bicycle Shop
Marlin 4 Gen 2 - Trek Bikes
Marlin 4 Gen 2 - 2023, Medium - Trek Bikes
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