Marin

Four Corners 1 Bike

Marin Four Corners 1 is an adventure-focused touring bike made for riders who want to go beyond the daily commute. It is equally suited to city riding, rough backroads, light gravel travel, and loaded bikepacking trips. The concept behind this model is simple: long-distance comfort, practical cargo options, and dependable components in a versatile steel platform.

The bike uses a custom-butted 4130 CrMo steel frame and fork, which the manufacturer positions as a comfort-oriented yet load-capable solution for rough pavement and washboard gravel. Marin also equips the Four Corners 1 with extensive mounting options, including bottle and accessory bosses, fork mounts, top tube mounts, rack mounts, and fender mounts. This makes it a very practical platform for bikepacking and utility riding.

The drivetrain is Shimano CUES 2x9, paired with 46/32T chainrings and an 11-36T cassette, giving it a broad and useful range for climbing with gear and covering distance efficiently. The bike also features Tektro mechanical disc brakes and 45 mm tires. Wheel size is matched to frame size, with 650b on XS and S, and 700c on M, L, and XL for a more proportional ride feel.

Marin Four Corners 1 is best suited to riders looking for a practical, stable, and comfortable adventure bike rather than a race-focused gravel build. It is a strong option for commuting, touring, light off-road exploration, and riders planning to carry luggage on longer trips.

Key features and benefits

• custom-butted 4130 CrMo steel frame and fork
• built for commuting, adventure riding, touring, and bikepacking
• Shimano CUES 2x9 drivetrain
• 46/32T crankset and 11-36T cassette
• Tektro mechanical disc brakes
• 45 mm tires
• multiple bottle and accessory mounts
• front and rear rack mounts
• fender mounts
• fork cargo mounts
• frame-size-specific wheel sizing: XS-S = 650b, M-XL = 700c 

Who is this product for
Marin Four Corners 1 is for riders who need one capable steel bike for commuting, mixed-surface riding, and longer loaded adventures. It is especially well suited to bikepacking beginners, touring riders, and people who value comfort, stability, and cargo versatility over a purely sporty gravel setup.

Specification

• Frame: custom-butted 4130 CrMo steel
• Fork: 4130 CrMo steel
• Drivetrain: Shimano CUES 2x9
• Chainrings: 46/32T
• Cassette: 11-36T
• Brakes: Tektro mechanical disc brakes
• Tires: 45 mm
• Mounts: bottle / accessory mounts, fork mounts, fender mounts, front and rear rack mounts, top tube mounts
• Sizes: XS, S, M, L, XL
• Wheel size by frame size: 650b for XS and S, 700c for M, L, and XL
• Colors listed by the manufacturer: Purple, Green 

FAQ

What is Marin Four Corners 1 designed for?
It is designed for commuting, adventure riding, touring, and multi-day bikepacking.

Does it support racks and fenders?
Yes. The manufacturer lists front and rear rack mounts, fender mounts, fork mounts, and additional frame mounting points.

What drivetrain does it use?
It comes with a Shimano CUES 2x9 drivetrain.

What gearing does it have?
The bike uses 46/32T chainrings with an 11-36T cassette.

Which wheel sizes come with which frame sizes?
XS and S use 650b wheels, while M, L, and XL use 700c wheels.

Caution: For logistical reasons, the bikes sold in our store are shipped partially disassembled. For most brands, this means that the saddle, front wheel and handlebars are removed. Assembly requires basic knowledge, however, it is recommended to have the bicycle assembled at a specialized bicycle service center. Bicycle manufacturers require a basic preliminary inspection at a specialized bicycle store, which is one of the warranty conditions.