RIDER HEIGHT RECOMMENDATIONS
Based on our research, riders at the heights below will usually take the corresponding frame size. If you’re at a transitional height that spans two sizes, look at the geometry chart to get the Stack and Reach you like based on other bikes you are comfortable.

GEOMETRY & SIZING
Borealis offers four frame designs with unique fit and geometry to suit your every Fat Bike need. Begin by taking a rough size approximation on the chart below that is based on height, then select the corresponding bike with your fit needs by using the geometry chart further below. We recommend a similar fit to you mountain bike, so grab a measuring tape and dial it in.

HIGHLIGHTS:

• Frame geometry provides responsive and nimble handling for variable conditions in snow or sand.
• Internally routed cables.
• Tire clearance up to 26x5” and 27.5x4.5”.
• Compatibility for 100-120mm of suspension travel for more technical riding.
• Lightweight, durable carbon fiber frame comes with 2-3 bottle cage mounts and lizard skin protectors on both the down tube and drive-side chain stay.
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SPECS

Frame includes:

• Chainstay and seatstay protectors
• Seatpost collar
• Rear axle and derailleur hanger

Frameset includes all of the above as well as:

• Complete headset and compression plug/ star nut
• Front axle

All frames are covered by a 5 year warranty and crash replacement program.

RIDER HEIGHT RECOMMENDATIONS
Based on our research, riders at the heights below will usually take the corresponding frame size. If you’re at a transitional height that spans two sizes, look at the geometry chart to get the Stack and Reach you like based on other bikes you are comfortable.

GEOMETRY CHART
Stack and Reach are the fundamental fit elements, they are both measured relative to the bottom bracket. When choosing the Borealis that is right for you, it’s important to find a balance in these measurements to ensure the best performance.