Marin Bikes

Four Corners 1

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Four Corners 1 profile, black. Four Corners 1 profile, light blue.

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  • Price: *
  • Wheel Size: 700C, 650B
  • Frame: CroMo/Steel
  • Size Range: XS, S, M, L, XL
  • Manufacturer’s suggested retail price may not include additional shipping or preparation charges. Please contact your local Marin dealer for a quote.

Midweek commute, weekend adventures. No problem for the Marin Four Corners, our steel-framed explorer that’s as comfortable on the asphalt as it is in the dirt.

A butted 4130 CrMo steel frame and fork are designed to be comfortable on rough roads but to also 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 all terrain.

Don’t be fooled, that classic frame material doesn’t mean low-tech. We’ve used biometric fit data to offer five different frame sizes, with size-matched 650b or 700C wheels to perfectly suit riders between 4’11” – 6’4”. A high front-end creates all-day comfort and heads-up visibility, off-road-ready geometry means you won’t skip a beat when you head off the asphalt and explore Beyond Road.

40mm wide multi-surface Vee GP tires are up for wherever your adventures take you, while Shimano's supremely reliable Sora 3x9 drivetrain ensures that you'll always have the right gear ratio. Finally, Tektro Spyre-C mechanical disc brakes deliver controlled braking, even when riding fully loaded.

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Specifications

  • Frame

    Series 1 CrMo, Size-Specific Wheels (XS, S = 650B, M, L, XL = 700C) , Biometric Geometry, Fender and Rack Mounts, Disc Mount, Plentiful Gear Mounts (custom bag templates here)

  • Fork

    Series 1 CrMo, Fender, Rack, and Bottle Cage Eyelets, IS Disc Mount

  • Rims

    Marin Aluminum, Double Wall, Disc Specific

  • Hub Rear

    Forged Aluminum Alloy, Disc, 32H

  • Hub Front

    Forged Aluminum Alloy, Disc, 32H

  • Spokes

    14g Black Stainless Steel

  • Tire

    Vee Tire Co., GPVee, 700/650x40

  • Derailleur Rear

    Shimano Sora 9-Speed

  • Derailleur Front

    Shimano Sora

  • Shift Levers

    Shimano Sora ST300 3x9-Speed

  • Crankset

    Shimano Sora FC3030, 50-39-30T

  • Bottom Bracket

    Shimano

  • Chain

    KMC X9

  • Cassette

    Shimano HG200 9-Speed, 11-34T

  • Brakes Front

    Tektro Spyre-C Road Mechanical Disc, 160mm Rotor

  • Brakes Rear

    Tektro Spyre-C Road Mechanical Disc, 160mm Rotor

  • Brake Levers

    Shimano w/ Integrated Shifters

  • Handlebar

    Marin Butted Alloy, Compact 16º Flared Drop

  • Stem

    Marin 3D Forged Alloy

  • Grips

    Marin Comfort Bar Tape, Shock Absorbing Gel Pads

  • Headset

    FSA No.8D, Sealed Cartridge Bearings

  • Seatpost

    Marin Alloy, 27.2mm

  • Saddle

    Marin MTB

  • Pedals

    Trekking Platform

Specifications, pricing, and availability are subject to change without notice.

Geometry

Four Corners 1 geometry diagram
XS S M L XL
Stack 560 580 618 648 679
Reach 376.7 381 403.3 412.6 426.6
Headtube Angle 70° 70° 71° 71° 71°
Headtube Length 167 188 188 209 252
Seattube Angle 74.5° 73.5° 73.5° 72.5° 72°
Seattube Length 381 422 462 495 528
Toptube Effective 532 553 586 617 647
BB Height 291 291 288.5 288.5 288.5
BB Drop 53.5 53.5 72 72 72
Chainstay 432 432 450 450 450
Wheelbase 1035 1047 1087 1107 1132
Standover Height 668 707 745 777 810
Fork Offset 43 43 49 49 49
Seatpost Diameter 27.2 27.2 27.2 27.2 27.2
Handlebar Width 400 400 420 420 440
Stem Length 70 70 70 70 70
Crank Length 170 170 175 175 175

All lengths in millimeters

Technology

Marin Four Corners front 3/4, in a Sonoma County, CA vineyard.

FIVE FRAME SIZES

The Four Corners is available in five frame sizes to fit riders 4’11 to 6’4” without compromise. For proper fit and bike handling sizes XS and S use 650B wheels, sizes M, L, and XL use 700C.

Marin Four Corners frame and fork and gear mounts.

BOTTLE / GEAR MOUNTS

Fork leg bottle or accessory cage mounts on the base Four Corners, along with traditional front triangle bottle mounts (three on sizes M-XL, two on XS-S) provide up to six bottle cage mounts total.

Marin Four Corners headtube detail.

TALL HEADTUBES

The Four Corners is built around a tall headtube, allowing for more frame carrying capacity (larger bags), great rider visibility for taking in the sights, as well as the ability to utilize the multiple positions on the drop bars for all-day comfort.

Marin Four Corners front brake detail.

DISC BRAKES

Disc brakes provide smooth, controlled stopping in all conditions with minimal maintenance. Especially important when riding a fully loaded bike.

Marin Four Corners Series 1 CrMo decal image.

STEEL IS REAL

The Four Corners uses butted and formed Series 1 4130 CrMo frames specially tuned for loaded touring with upright geometry for comfortable and efficient all-day rides.

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4C1 frame detail, showing generous tire clearance.

GENEROUS TIRE CLEARANCE

The Four Corners 1 can accommodate tires up to 45mm wide.

Four Corners 1 seat tube dropper post port detail.

Dropper Post Compatible

The Four Corners offers a port on the lower part of the seat tube, allowing the installation of an aftermarket dropper post. Droppers are great at adding clearance when riding technical trails, or for simply putting a foot down while stopped at a light.

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