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
TREK Marlin 4 Gen 2 2024 :: £499.00 :: Bikes :: Children's Bikes - 26 and 27.5" Wheel :: Ken Ellerker Cycles