M
MarinFour Corners
gravel
01
Origin
The Four Corners has been Marin's dedicated bikepacking and loaded touring platform since 2015, built around the idea that a bike should handle four corners of the world as comfortably loaded as unladen. It is the most touring-oriented bike in the Marin gravel lineup, differentiated from the Nicasio by its lowrider fork mounts, six bottle cage bosses, and explicit packing DNA.
02
Specifications
- Frame
- Butted 4130 CrMo steel frame; six bottle mounts, rack and fender eyelets, lowrider fork mounts; disc brake; designed for fully loaded touring and bikepacking
- Drivetrain
- Four Corners 1 (2025): MicroShift Sword 2x9 drivetrain; Four Corners 2: SRAM Apex 1x12
- Brakes
- Hydraulic disc brakes across all builds
- Wheels
- Size-matched: XS and S frames use 650b; M, L, XL use 700c; tire clearance up to 45mm
03
The verdict
+Strengths
- Most mount points in the Marin lineup -- six bottles plus lowrider and rack eyelets
- Size-matched wheel sizing ensures proper fit and tire volume for all riders
- Steel CrMo soaks up road buzz over long days loaded with gear
−Weaknesses
- Heavier than alloy or carbon alternatives -- steel touring weight is the price of durability
- Less nimble than lighter gravel bikes when ridden unloaded
- MicroShift Sword groupset is new and less proven in the field than Shimano GRX
04
Tags
05
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