Marin Four Corners Touring Disc Road Bike


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When the open road calls, the Marin Four Corners is a bike with the utility, durability, and reliability to keep you going on tour for as long as you want to ride. With a frame and fork crafted from double butted chromoly steel, the Four Corners is as much a work of steel art as it is a fully-functional touring bike. The comfort-oriented geometry makes the going a little easier, thanks to the tall head tube and long, stable wheel base. Full rack and fender mounts give you plenty of options for carrying your gear and staying dry. Furthermore, the frames feature size-proportionate wheels with the XS and S frames utilizing 650B wheels and the M, L, and XL frames sporting 700c wheels for a proper fit.

If you've ever been touring, you know that reliability and functionality are key with components. That's why Marin went with the bombproof reliability of a Shimano Sora 3x9-speed drivetrain. Shimano has a reputation for utter reliability and ease of service all over the world, so in the unlikely event something should go wrong, it'll still be easy to fix. And 3x9-speed drivetrains have been a standard in touring for a long time, and with good reason. The wide gearing range gives you plenty of options to get a fully loaded bike over just about any mountain pass, with minimal gear overlap and easy maintenance. Mechanical disc brakes provide powerful, all-weather stopping performance, and doublewall alloy 32-spoke wheels set up with stout WTB tires are the epitome of dependability and toughness.



Key Features

  • Double butted chromoly steel frame and fork
  • Size-proportionate wheel sizes - smaller frames use 650B wheels, larger frames use 700c wheels
  • Shimano Sora 3x9-speed drivetrain
  • Tektro Spyre-C Road Mechanical Disc with 160mm rotors
  • Robust, 32-spoke, doublewall, alloy rims
  • WTB 700x43 or 650Bx43 tires
  • Full front and rear rack and fender eyelets
  • Lifetime Warranty on frame
  • Full manufacturer’s warranty on parts
  • Weight: 13.8kg (including pedals)


Your bike will arrive in a custom Bicycles Online bike guard box as described in the below video.



Marin Four Corners


Utilitour Double Butted CrMo, Size-Speci c Wheels (XS, S = 650B, M, L, XL = 700C) , New Biometric Geometry, Fender and Rack Mounts, Disc Mount


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


Marin Butted Alloy, Compact 12º Flared Drop


Marin 3D Forged Alloy


FSA No.8D, Sealed Cartridge Bearings


WTB Volt Sport 142 Custom


Marin Alloy


Shimano Sora Hollowtech II, 50/39/30T


Shimano Hollowtech II




Shimano HG300 9-Speed, 11-34T


Shimano Sora


Shimano Sora - 9 speed


Shimano Sora 3 x 9 speed


Shimano w/ Integrated Shifters


Tektro Spyre-C Road Mechanical Disc, 160mm Rotor


WTB Resolute, 650B/700Cx42, Puncture Protection


Marin Aluminum, Double Wall, Disc Specific, Alloy hubs
Size Chart






RIDER HEIGHT 150-160cm 157-167cm 167-178cm 178-185cm 185-193cm


Note: If you are in between sizes, measure your wingspan. If it is greater than your height, go for the frame size up. If your height is greater than your wingspan, go for a frame size down.


We understand how important shipping is once you click "buy now", that's why we have the following policies

Australian Warehouse

All products are in stock and ready to ship from our Sydney warehouse (with the exception of preordered bikes, which have the dispatch date illustrated)

Next day dispatch

All orders received by 5 pm AEST will usually be dispatched the following business day. If an order is placed on the weekend or public holiday, please note dispatch will usually be the next working day. For tracked shipments, please allow 12 hours for tracking to begin.

Shipping of Parts, Accessories and Apparel

Economy Shipping

There is free delivery available on all small parcels Australia wide using tracked services of Australia Post or Fastway, no minimum order value required! Estimated delivery time is 4-9 business days. 

Express Shipping

We do also offer Express Shipping for a small additional fee on parts, accessories and apparel orders. Estimated delivery time on Express Shipping is 1 to 4 business days.

Shipping of Bikes

Shipping of bikes and other bulky goods is free to 85% of residences in Australia. However, some postcodes incur a surcharge starting from $29. 

Once shipped you will be issued a consignment number which can be used to track your parcel. We use Direct Freight Express for deliveries and you can track your delivery by calling 1300 347 397 or online at


We’re so confident that you’ll love our extensive range of bikes, that we’ll let you ride one as your own for a full 14 days and if you don’t like it, simply e-mail us at and we’ll pick it up from you, free of charge! Just make sure you keep the box so it can be re-used to send it back. Click here for more information. 

All of our bicycles come with a Free Pro Build valued at $99. This means that your bicycle will be pre built by our professional mechanics. For your convenience, safety and comfort all our bikes are fully assembled prior to delivery. The bike is then packaged back into a box for secure shipment.


When your bike arrives, all you have to attach is the front wheel, the handlebar and pedals, everything else has been done – the headset has been adjusted, wheels trued, pedals and seat post greased, brakes and gears calibrated, and the tyres have been pumped up (please note upon arrival, in some cases you may need to add more air to tyres).

Most companies simply sell you the bike as it comes from the factory, which will require significant know-how to get your bike on the road. Currently we are the only Australian company providing this service, and have the 14 day test ride to back it up.

All tools are provided with the bike.

If you are unsure of how to assemble this bike after viewing the instruction videos above, we recommend you ask for help from someone with knowledge of how to use basic hand tools. 

Please note, that all bicycles whether purchased online or instore, are mechanical devices and need to be serviced regularly to ensure proper functioning. 

This bicycle is backed by a LIFETIME factory warranty on frame and full manufacturer’s warranty on parts. Lifetime warranty refers to the lifetime of the original owner.

Warranty is valid only for bicycle that has been properly and well-maintained under the following conditions:

Warranty includes:

  • All damaged or fractured or broken frame / fork / component which was caused by manufacturing or assembling error in factory.
  • Non functioning mechanism caused by manufacturing error in factory.

Warranty is NOT valid for:

  • Incorrect assembly, i.e pedals installed in the wrong crank arm. 
  • Normal degradation caused by frequent use, such as degrading brake shoe, deflated tire, etc
  • Surface defects, such as stained, marred, defaced, etc
  • Damaged caused by misuse or accident
  • Other damages which are not caused by factory error
  • Bicycle which has been sold to other party
  • Bicycle used in commercial, such as rented
  • Bicycle which has not been well-maintained

For any damages which is guaranteed by the brand as the first condition above, the brand will repair or replace damaged frame / fork / component with the one of the same brand or similar.

Warranty is valid for all Polygon and Marin bicycles to the original owner only, by showing the purchase invoice.  

To make a claim click here.

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