Frameset
Frame
Series 1 CrMo, Size-Specific Wheels (XS, S = 650B; M, L, XL = 700C), Biometric Geometry, Fender and Rack Mounts, Disc Mount
Fork
Series 1 CrMo, Fender, Rack, and Bottle Cage Eyelets, IS Disc Mount
Four Corners 1
The Marin Four Corners is a dedicated steel adventure-touring and bikepacking platform built for long days, heavy loads, and mixed surfaces. Updated for 2024, this generation retains the model's signature upright riding posture while introducing subtle frame refinements and modern utility. Marin expanded the bike's cargo capacity by adding numerous accessory mounts, including dedicated top tube and under-top tube bosses designed to simplify custom framebag layouts. The frame also gains a port for dropper post routing and clears wider tires than its predecessor.
Positioned for commuters, world tourers, and dirt-road explorers, the Four Corners prioritizes durability and comfort over outright speed. It is a utilitarian workhorse that relies on a robust chromoly chassis and high-volume rubber to smooth out rough terrain, offering a reliable foundation for riders who measure their trips in days rather than hours.
$1,249
Build
Size
| Stack | 580mm |
| Reach | 381mm |
| Top tube | 553mm |
| Headtube length | 188mm |
| Standover height | 707mm |
| Seat tube length | 422mm |
Fit and geometry
The Four Corners is defined by an intentionally tall front end and a stretched-out wheelbase, creating a highly upright, back-friendly posture. For this generation, Marin slightly relaxed the head tube angle and shortened the head tube, though the overall stack remains exceptionally high. This geometry keeps the rider's weight comfortably distributed during long days in the saddle but can make the bike feel slightly tippy during fast, flat cornering on loose surfaces.
Because the effective top tube is quite long, the reach can feel expansive. Some reviewers suggest riders between sizes might prefer sizing down to achieve a better balance between their back and arm angles. To keep the steering manageable despite the long front-center and slack head angle, Marin specs a short stem paired with wide, flared handlebars. This cockpit setup provides ample leverage to control the heavy front wheel and offers multiple hand positions to reduce fatigue on extended tours.
Full specs
Groupset
Shift levers
MicroSHIFT Sword Black, 2x9-speed (integrated brake/shift levers)
Rear derailleur
MicroSHIFT Sword Black, 9-speed
Cassette
MicroSHIFT, 9-speed, 11-38T
Chain
KMC X9
Crankset
Forged Aluminum, 46-29T
Bottom bracket
Square taper, sealed bearing
Front brake
Tektro Spyre-C Road mechanical disc
Rear brake
Tektro Spyre-C Road mechanical disc
Front rotor
160mm
Rear rotor
160mm
Wheelset
Front wheel
Marin Aluminum, Double Wall, Disc Specific; Forged Aluminum Alloy, Disc, 32H; 14g Black Stainless Steel
Rear wheel
Marin Aluminum, Double Wall, Disc Specific; Forged Aluminum Alloy, Disc, 32H; 14g Black Stainless Steel
Front tire
Vee Tire Co., GPVee, 700/650x40
Rear tire
Vee Tire Co., GPVee, 700/650x40
Cockpit
Stem
Marin 3D Forged Alloy
Handlebars
Marin Butted Alloy, Compact 16º Flared Drop
Saddle
Marin MTB
Seatpost
Marin Alloy, 27.2mm
Grips
Marin Comfort Bar Tape, Shock Absorbing Gel Pads
Builds
The Four Corners lineup consists of two builds, both utilizing size-specific wheels that pair 650b hoops with the smallest frames and 700c wheels with the larger sizes. The entry-level Four Corners 1 uses a Series 1 chromoly frame with quick-release axles and mechanical disc brakes. It features a 2x9 microSHIFT drivetrain that provides a massive gear range, allowing riders to spin up steep grades even when fully loaded. It rolls on 45mm tires, though its rims are not tubeless-compatible.
The Four Corners 2 represents a significant step up in modern standards and frame quality. It upgrades to a Series 3 double-butted chromoly frameset equipped with front and rear thru-axles and flat-mount disc tabs, which together reduce flex and brake rub under heavy loads. This build shifts to a 1x12 SRAM Apex Eagle drivetrain and hydraulic disc brakes for improved stopping power and simpler maintenance. It also includes tubeless-compatible rims wrapped in 44mm tires, though the frame officially clears up to 50mm rubber for those wanting maximum volume.
1
$1,249
Selected
2
$2,299
Reviews
Reviewers consistently praise the Four Corners for its exceptional comfort and steadfast stability, particularly when fully loaded. The combination of a compliant steel frame and high-volume tires effectively smooths out rough terrain, with one tester noting the setup helps "take the sting out of poor road surfaces, canal towpaths and light gravel" (Road.cc). On descents and long stretches of open road, the bike's long wheelbase and relaxed front end keep it tracking predictably. When packed with gear, the chassis remains composed, and testers found that it "carried weight like a mule" (GearJunkie) without unwanted flex or erratic handling.
The primary tradeoff for this load-hauling capability is a distinct lack of urgency. The bike's substantial weight and touring-focused geometry mean that acceleration is slow, and power transfer feels "leisurely rather than efficient" (Road.cc). Steering response is similarly deliberate, requiring conscious input during tight, low-speed maneuvers or technical singletrack descents.
Despite its leisurely demeanor, the platform earns high marks for its overall value and reliability. The component choices across the lineup are viewed as highly practical for remote riding, leading reviewers to consider the bike a "stone-cold bargain" (Road.cc) for budget-conscious adventurers seeking a dependable travel companion.
