OB-344 | Boundary, GRX 810 2X with Sunringle Charger 700c with Silk Seatpost, Size S
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.
19.2lbs / 8.7kg*
*Weight including 700c wheels on size medium bike.
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 Material||Carbon Fiber|
|Max Tire Size||700x45c or 650x53|
|Front Axle Specs||12x1.5x120mm|
|Rear Axle Specs||12x1.5x172mm|
|Seat Collar Diameter||31.8mm|
|Max Chainring Size||52/36t|
|Rotor Max Size (Front)||180mm|
|Rotor Max Size (Rear)||160mm|
|Front Derailleur Mount||Braze-on|
|Water Bottle Mounts||Yes|
|Toptube Bag Mounts||Yes|
|Downtube Accessory Mount||Yes|
|Rigid Fork Length||395mm|
Size Chart & Geometry
|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|
|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|