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Boundary Shimano GRX 820 1X 12 spd | Size S

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OB-407 | Boundary, Shimano GRX 820 1X 12 spd with Spingery GX 700c Wheels, Size S

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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.

Material

Carbon Fiber

Weight

19.2lbs / 8.7kg*
*Weight including 700c wheels on size medium bike.

Features


Bar, Stem + Crank Specs

Size XS, S Bar: 42cm; Stem: 90mm; Crank: 170
Size M Bar: 44cm; Stem: 100mm; Crank: 172.5
Size L, XL Bar: 46cm; Stem: 110mm; Crank: 175

Frame Details

Frame Specs

Frame Material Carbon Fiber
Max Tire Size 700x45c or 650x53
Headset Upper

IS42
Headset Lower

IS52
Crown Race

40mm
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

Yes
Rack Mounts

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

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˚

71.0˚

71.5˚

72.0˚

72.0˚
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