Trek Marlin 4 Gen 2 - Western Cycle Source for Sports | Regina, Saskatchewan | est. 1912
2021 Trek Marlin 4 29" Bike Grey
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