Seen here with X01 livery and 45NRTH Husker Du tires, the Borealis Echo starts to look less like just a fat bike and a lot more like a mountain bike. SRAM's unflappable one by drivetrain, hydraulic disc brakes, and a real deal suspension fork from RockShox round out the Echo's already capable carbon fiber frame. Borealis believes that fat bikes are meant to be ridden anywhere and everywhere, and when we see them built like this, we're inclined to agree. It's nearly as efficient as your favorite hardtail, but with heaps more traction and confidence over rough trails and chunky downhills. At the heart of the Echo is the 197mm rear spacing and 135mm front spacing that allow for super strong, dishless wheels.