Marin Four Corners 2Midweek commute, weekend adventures. No problem for the Marin Four Corners, our steel framed explorer that's as comfortable on the asphalt as in the dirt. A double butted 4130 CrMo steel frame and fork are designed to be comfortable on rough roads and handle fully loaded touring and bikepacking. We've included six bottle mounts, rack and fender eyelets, lowrider fork mounts, generous tire clearance, and disc brakes to set you up for all conditions and