FLUME FRAME

    RIDER HEIGHT RECOMMENDATIONSBased 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 & SIZINGBorealis 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.     S M L XL EFFECTIVE TOP TUBE 585 mm 610 mm 630 mm 650 mm SEAT TUBE CENTER TO TOP 381 mm 432 mm 484 mm 534 mm HEAD TUBE 105 mm 120 mm 135 mm 150 mm SEAT TUBE ANGLE 73 deg 73 deg 73 deg 73 deg HEAD TUBE ANGLE 70 deg 70 deg 70 deg 70 deg STANDOVER HEIGHT Varies based on wheel and tire size CH