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Boundary Gravel Bike


Boundary Frameset

Size Guide

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Go Beyōnd

A rugged and dependable gravel bike ready to kick up some dust as you redefine what’s rideable. The Boundary has the geometry of a road bike with the heart and handling of a trail bike so you can rumble confidently across all kinds of mixed terrain. 

According to the Federal Highway Administration, there are 1.4 million miles of unpaved roads in the U.S. just waiting to be explored—and we haven’t even looked up the international mileage. So take the roads less traveled, or the ones that don’t even show up on the map. Are you ready to push your boundaries?

This Bike Is For You If...

You're looking for an epic carbon-fiber gravel bike that won't break the bank. You'll be able to run 700c or 650b tires with plenty of clearance, install up to three water bottle mounts and racks in the front and rear. 

You're ready to take your riding to the next level and race in any gravel event. In 2019, the Boundary made its fast debut by placing 3rd at the Dirty Kanza 100. 

*Max packed out weight — 300 lbs.

Learn more about the Boundary with the Owner's Guide

Read Boundary Stories

Frame Details

Frame Specs

Max Tire Size 700x45c or 650x53
Headset Upper

Headset Lower

Crown Race

Front Spacing 12x100mm
Front Axle Specs 12x1.5x120mm
Rear Spacing 12x142mm
Rear Axle Specs 12x1.5x172mm
Seatpost Diameter 27.2mm
Seat Collar Diameter 31.8mm
BB Standard BB86
Max Chainring Size 52/36t
Rotor Max Size (Front) 180mm
Rotor Max Size (Rear) 160mm
Front Derailleur Mount Braze-on
Derailleur Hanger Proprietary
Water Bottle Mounts Yes
Fender Mounts

Rack Mounts

Three-Pack Mounts Yes
Toptube Bag Mounts Yes
Downtube Accessory Mount Yes
Fork Offset 50mm
Rigid Fork Length 395mm

Carbon Fork

Our full-carbon adventure gravel fork is designed with performance and versatility in mind:

  • Three-pack mounts for water bottle or cargo cages.
  • Built-in fender mounts for wet weather comfort.
  • Fork Steer Tube Diameter: 1 1/8” to 1 1/2” tapered
  • Axle Spacing: 12 x 100mm
  • Compatible Rotor sizes: 140 and 160mm

Elevate your off-road experience with a fork that combines precision, comfort, adaptability, and style.

Size Chart & Geometry

Size Guide

Bike Geometry

Size XS S M L XL
Top Tube Length (mm) 520 535 550 565 580
Head Tube Length (mm) 120 140 150 170 190
Seat Tube Angle 74.5˚ 74.0˚ 73.0˚ 73.0˚ 73.0˚
Head Tube Angle 70.5˚
BB Drop (mm) 67 67 67 67 67
Chainstay Length (mm) 435 435 435 435 435
Wheelbase (mm) 1020 1021 1026 1037 1052
Front Center (mm) 594 595 600 611 626
Standover Height (cm) 75.9 78.6 80.3 82.3 84.3
Fork Axle to Crown (mm) 395 395 395 395 395
Fork Rake (mm) 50 50 50 50 50
Seat Tube Length (mm) 490 520 540 560 580
Reach (mm) 371 375 376 385 394
Stack (mm) 537 557 568 590 609

Shipping & FAQ

Shipping & Delivery Options

OBED bikes ship pre-assembled factory direct to your doorstep with a super simple setup process or delivered fully built by a technician. Learn more about our Domestic and International Shipping & Delivery Options.

Have more Shipping Questions? Check out our frequently asked shipping questions.

What should I do if I am between on two sizes?

If you can achieve your required seat height with both bikes sizes, then you can pick based on your riding preference or style. The smaller frame will be more nimble while the larger bike may feel higher and faster. LiveChat with us or email us for help finding the right size.

How do I mount accessories onto my Obed?

Our Baseline and Boundary models have various mounting points for a multitude of accessories available on the market. 

For nutrition and hydration, our water bottle and top tube storage mounts can be used with most 2-hole accessories designed for M5 x 0.8mm mounts spaced 65mm apart. The screws provided with the frame are 10mm long and should be replaced with longer screws should your accessory mounting bracket be more than 3mm thick.

At the rear of the bike, we have provided fender and light rack mounting points.  Unlike many metal bikes which may have open ended mounting points, our carbon fiber frames have closed end mounting points.  This requires special attention to the length of screw when mounting racks and fenders with various thickness attachments.  Should the accessory mounting point be more than 2mm thick, source screws that are 10-13mm longer than the thickness of the item you’re attaching. 

For fork mounted accessories, the same rules apply as mounting to our seatstays and dropouts.

We recommend a 20lb load weight limit. 

What is your Return Policy?

Put your new bike to the test with our 30 day return policy. If it's not for you, just box it up the way you received it and contact our support team for further instruction.


Factory Installed scuff guards

Up Close and Personal

There's an OBED for You

It doesn’t matter if you’ve been riding for years or a few months — we all crave that feeling of freedom that grows stronger with every turn of the pedal crank.

Keep chasing that feeling on one of our rugged and refined steeds specially designed for gravel, road, or mountain adventures.

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