Marin Bikes | 2025 Four Corners 2

📏Size Guide

Adventure-focused steel touring performance built for gravel exploration, long-distance riding, commuting, and loaded bikepacking.

The Marin Four Corners 2 is a versatile steel adventure bike designed for riders who want stability, comfort, and carrying capability across gravel roads, pavement, touring routes, and bikepacking expeditions. Built around Marin’s Series 3 double-butted CrMo frame and Biometric Geometry, the Four Corners 2 prioritizes long-distance comfort and confident loaded handling without sacrificing all-road versatility.

Designed with size-specific wheel configurations, generous tire clearance, plentiful mounting points, and a SRAM Apex 1x12 drivetrain, the Four Corners 2 delivers dependable mixed-surface capability for riders planning everything from daily commuting to multi-day touring adventures.

Key Features

• Series 3 Double-Butted CrMo Frame
Steel frame construction provides a smooth ride feel, long-distance comfort, and durability for loaded adventure riding.

• Size-Specific Wheel Configurations
XS and Small sizes use 650B wheels for proportional handling, while Medium through XL sizes use 700C wheels for improved rollover efficiency.

• Adventure and Touring Ready Design
Integrated rack mounts, fender mounts, bottle cage mounts, and gear mounts support commuting, touring, and bikepacking setups.

• SRAM Apex 1x12-Speed Drivetrain
Wide-range 12-speed gearing offers reliable shifting performance and climbing capability across mixed terrain.

• Hydraulic Disc Braking System
SRAM hydraulic disc brakes provide confident stopping power and control in varying conditions.

• Tubeless-Compatible Wheelset
Wide tubeless-ready rims and 45mm tires improve comfort, traction, and off-road versatility.

Technical Specifications

• Category
Steel Adventure Touring Bike

• Discipline
Gravel, Road, Urban/Other

• Frame
Series 3 Double Butted CrMo, Biometric Geometry, 142x12mm Thru-Axle, Flat Mount Disc

• Fork
Series 3 CrMo Fork, 100x12mm Thru-Axle

• Bottom Bracket
SRAM DUB BSA

• Headset
FSA No.42/ACB

• Rear Derailleur
SRAM Apex 1 12-Speed

• Front Derailleur
N/A

• Shifters
SRAM Apex 1 1x12-Speed

• Crankset
SRAM Apex 1, 40T

• Cassette
SRAM CS-XG-1275, 10-52T

• Chain
SRAM NX

• Brakes
SRAM Apex 1 Flat-Mount Hydraulic Disc Brakes

• Brake Rotors
160mm

• Wheelset
Marin Aluminum Double Wall, 25mm Inner Width, Tubeless Compatible

• Front Hub
Forged Aluminum Alloy, Disc, 32H

• Rear Hub
Forged Aluminum Alloy, Disc, 32H

• Tires
Vee Tire Co. Quickstyx 45mm, Tubeless Compatible

• Handlebar
Marin Butted Alloy, Compact 16° Flared Drop

• Stem
Marin 3D Forged Alloy

• Seatpost
Marin Alloy, 27.2mm

• Saddle
Marin Beyond Road Concept

• Pedals
Marin Oso OEM Nylon Platform

• Color Options
Gloss Ti Grey / Yellow / Black (#808080)

Geometry

Built for riders seeking a capable steel adventure bike for gravel exploration, loaded touring, bikepacking, commuting, and all-road riding.