Marin Four Corners 1 Touring Bike 2026

Break into the unknown, challenge yourself, take small steps or go for the home run – the Four Corners 1 is ready. Ride to work, adventure midweek or disconnect on multi-day bikepacks without emptying your wallet.

A custom-butted 4130 CrMosteel frame and fork are washboard-comfortable without sacrificing fully-loaded strength. Carrying capacity is maximized with bottle, accessory, fork and fender mounts. Wheel and rider size harmonize – XS and S get 650b and M-XL roll on 700c.

Goldilocks approves. Glide confidently with Shimano’s CUES 2x9 drivetrain, wide tires and disc brakes. 

The Four Corners 1’s custom-butted 4130 CrMo steel frame and fork aren’t just tough, they’re legendary. Make miles disappear – steel soaks up splintered pavement and washboard gravel chatter like a champ, while not wincing under a full load of gear. The butted tubes keep weight reasonable without sacrificing strength where it matters most. It's the material of choice for riders who value comfort over the long haul.

Wheel size is matched to frame size – the Four Corners feels proportional and rides right. Extra-small and small frames roll on 650b wheels, while medium, large and extra-large sizes get 700c hoops. There are no awkward compromises – just proper fit from the ground up.

Let’s talk mounts because the Four Corners 1 is stacked. Four (M-XL, three on the XS-S) bottle or accessory bosses inside the main triangle give you options for water, tools or whatever else you need to carry. Accessorize with top tube mounting points, perfect for frame bags. Rack mounts front and rear are ready to load up with panniers for serious hauling capacity. Fender bosses are there for guards to keep you clean when the weather turns nasty. Fork mounts add even more cargo versatility. It’s ready for however you want to pack it.

Shimano's reliable CUES 2x9 drivetrain busts hills and eats miles. The 46 and 32t chainrings paired with an 11-36t cassette mean your magic ratio is just a click away – loaded climbs, flat tarmac and everything in between.

Rain, mud or dust are no challenge for Tektro’s mechanical disc brakes – they’ve got powerful and reliable stopping power. The mechanical design means easy roadside adjustment and maintenance – crucial when you’re out exploring. Chunky 45mm wide tires come stock, but you can run rubber that suits your terrain – whether that’s smooth tarmac or chunky gravel – thanks to wide frame and fork tire clearance.

Specifications

Geometry

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.

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.

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.

DISC BRAKES

Disc brakes provide smooth, controlled stopping in all conditions with minimal maintenance.

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.

GENEROUS TIRE CLEARANCE

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

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.