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The Four Corners series is perfectly suited to today’s commute and tomorrow’s touring adventures. The butted 4130 CrMo steel frame and fork are designed to handle fully loaded touring, with up to six bottle mounts, rack and fender eyelets, lowrider fork mounts, generous tire clearance and disc brakes to bring it all to a stop. Four Corners geometry is based on biometric fit data, and we offer five different frame sizes with size proportionate 650B or 700C wheels to properly fit riders between 4’11” – 6’4”. The bars are set high for all-day comfort and heads-up visibility in traffic, with mountain steering geometry capable of taking you down whatever path your destination requires. Carry a laptop and change of clothes during the week, a tent and camp stove come Saturday morning. Get to work, and get out of town.


Marin Four Corners 2 front 3/4, in a Sonoma County, CA vineyard.


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.


Fork leg bottle or accessory cage mounts on the Four Corners, along with and abundance of gear mounts within the front triangle, mean that you can carry pretty much anything you want.

Marin Four Corners headtube detail.


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


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

Step up to the Four Corners 2 and you'll get a Series 3 frame with double butted tubing and thru-axles.

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4C1 frame detail, showing generous tire clearance.


The Four Corners 1 can accommodate tires up to 45mm wide, while the Four Corners 2 will accept up to 50mm wide tires.

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.