Marin Bikes | 2025 Four Corners 1

📏Size Guide

Built for wandering farther, carrying more, and staying comfortable through every road, gravel path, and bikepacking route ahead.

The Marin Four Corners 1 is a steel adventure touring bike designed for riders who want a dependable platform for commuting, gravel exploration, touring, and long-distance mixed-surface riding. Built around Marin’s Series 1 CrMo steel frame with size-specific wheel sizing and cargo-ready mounts throughout, the Four Corners 1 balances durability, comfort, and versatility for riders who value capability over trends.

With a MicroSHIFT Sword 2x9-speed drivetrain, mechanical disc brakes, flared drop bars, and wide 40mm tires, the Four Corners 1 is equally at home on pavement, gravel roads, urban commutes, and loaded touring adventures.

Key Features

• Series 1 CrMo Steel Frame
Durable steel construction designed for comfort, stability, and long-distance reliability.

• Adventure Touring Geometry
Biometric geometry offers a stable and comfortable ride position for gravel, commuting, and loaded riding.

• Size-Specific Wheel Platform
XS and Small sizes use 650B wheels for better proportional handling, while Medium to XL sizes use 700C wheels for improved rollover speed.

• MicroSHIFT Sword 2x9-Speed Drivetrain
Wide-range gearing built for climbing, gravel riding, commuting, and touring versatility.

• Mechanical Disc Brakes
Reliable braking performance with easy serviceability for long-distance use.

• Cargo and Touring Ready
Multiple rack, fender, and bottle cage mounts make the bike ideal for bikepacking and utility riding.

• Flared Drop Handlebar
Provides improved control and comfort across rough roads and gravel terrain.

Technical Specifications

• Category
Gravel Bike

• Discipline
Gravel / Road / Urban

• Frame
Series 1 CrMo Steel, Biometric Geometry, Fender and Rack Mounts

• Fork
Series 1 CrMo Steel Fork with Rack and Bottle Cage Eyelets

• Bottom Bracket
Square Taper, Sealed Bearing

• Headset
FSA No.8D Sealed Cartridge Bearings

• Rear Derailleur
MicroSHIFT Sword Black 9-Speed

• Front Derailleur
MicroSHIFT Sword Black

• Shifters
MicroSHIFT Sword Black 2x9-Speed

• Crankset
Forged Aluminum, 46/29T

• Cassette
MicroSHIFT 9-Speed, 11-38T

• Chain
KMC X9

• Brakes
Tektro Spyre-C Mechanical Disc Brakes

• Brake Rotors
160mm

• Wheelset
Marin Aluminum Double Wall Disc Wheels

• Front Hub
Forged Aluminum Alloy, Disc, 32H

• Rear Hub
Forged Aluminum Alloy, Disc, 32H

• Tires
Vee Tire Co. GPVee 700/650x40C

• Handlebar
Marin Butted Alloy Compact 16º Flared Drop Bar

• Stem
Marin 3D Forged Alloy

• Seatpost
Marin Alloy, 27.2mm

• Saddle
Marin MTB Saddle

• Pedals
Trekking Platform

• Color Options
Tan / Maroon (#9C6B4E / #5A1F1F)
Black (#000000)

Geometry

Suitable for gravel riding, touring, commuting, bikepacking, urban riding, and long-distance mixed-surface adventures.