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Since 2013, Borealis has specialized in lightweight carbon fiber fat bikes. 

    COMPATIBILITY

    • Rockshox Bluto Fork tire size limitations: 26x5” or 27.5x4”
    • Mastodon Pro EXT Fork tire size limitations: 26x5” or 27.5x4.5”
    • Borealis Rigid Carbon Fork tire size limitations: 26x5” or 27.5x4.5”
    • Dually 29x45 and 27.5x45 Rims – Max tire width: 3”
    • All rims 65mm to 85mm wide are compatible with tire widths of 3.8” to 5”
    • HED Carbon 100mm Rims – Max tire width of 4.6”

      ASSEMBLY

      If you choose "No Assembly" your bike will require complete assembly with an exception of the wheels. 

      If you choose "Assembled by Borealis", there is some assembly required upon receipt. Your bike will be completely assembled and tuned by Borealis, then partially disassembled for shipment. The remaining assembly will require installation of the rear derailleur, chain, fork, seat post, wheels, and handlebars. A multi-tool will be included with your order that has all tools necessary to assemble the bike, with the exception of a torque wrench. If you are not familiar with this level of assembly, we recommend having your local bike shop complete the assembly. Below is a video showing the remaining assembly once you receive the bike.

      Assembly Video 

       

      WHEELS & TIRES

      • All bikes come standard with tubes.
      • If you order rim tape with your Mulefut rims, we will tape the rims and install the tires with tubes.
      • HED Alloy and HED Carbon rims do not require rim tape for tubeless set up.
      • Tubes must be removed and tubeless valves installed for tubeless set up. We recommended to have this completed by a professional bicycle mechanic.

         

        SIZE CHART

        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.

         

         

        BUILD SPECS

        Frame Flume (Aluminum)
        Fork Borealis Carbon Rigid Fork Standard Option
        Bottom Bracket SRAM DUB 100mm
        Crankset SRAM Eagle NX Alloy 175mm w/ SRAM X-SYNC 30T SRAM Eagle GX Alloy 175mm w/ SRAM X-SYNC 30T SRAM Eagle X0 Carbon 175mm w/ SRAM X-SYNC 30T SRAM Eagle XX Carbon 175mm w/ SRAM X-SYNC 30T
        Rear Derailleur SRAM Eagle NX 12 Speed SRAM Eagle GX 12 Speed SRAM Eagle X0 12 Speed SRAM Eagle XX 12 Speed
        Chain Eagle GX Eagle GX Eagle GX Eagle XX Gold
        Cassette PG 1230 11-50 XG 1275 10-52 XG 1295 10-52 XG 1299 10-52
        Shifter SRAM Eagle NX SRAM Eagle GX SRAM Eagle GX SRAM Eagle GX
        Brakes SRAM Level T 2-piston OR SRAM G2 RS 4-Piston Hydraulic
        Rotors SRAM Centerline 160mm
        Headset FSA
        Hubs Borealis GEN 4 Black 15x150 Front / 12x197 Rear
        Rims Sun Ringle Mulefut V2 26x80 or 27.5x65
        Spokes Borealis Straight Gauge
        Nipples Borealis Silver Brass
        Tires Your Choice
        Bar Borealis Carbon 35x760mm
        Stem Borealis 50mm
        Post Borealis Carbon 31.6x400mm
        Saddle Borealis
        Grips Ergon GP10
        DT/CS Protector Lizard Skins
        Weight See weight calculator for estimated weight.

        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.

          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
        CHAINSTAY 459 mm 459 mm 459 mm 459 mm
        BB DROP 60 mm 60 mm 60 mm 60 mm
        REACH 407 mm 423 mm 438 mm 451 mm
        STACK 597 mm 611 mm 625 mm 639 mm

         

        OWNER'S MANUAL

        Download Owner's Manual

         

         

        PO boxes not accepted. Shipping discounts or exclusions only apply within the lower 48 states of the US. Contact us if damage occurs during shipping. 

        Borealis offers a 30-day money-back guarantee. If you are unsatisfied with your purchase for any reason, you can cancel, exchange, or return your product for a full refund, minus any associated transaction fees and shipping costs. Customer is responsible for return shipping costs. Returned and exchanged items must be in sellable condition. Affirm transactions are subject to a 10% non-refundable transaction fee.

         

         

        $2,199.00
        Since 2013, Borealis has specialized in lightweight carbon fiber fat bikes. 

          COMPATIBILITY

          • Rockshox Bluto Fork tire size limitations: 26x5” or 27.5x4”
          • Mastodon Pro EXT Fork tire size limitations: 26x5” or 27.5x4.5”
          • Borealis Rigid Carbon Fork tire size limitations: 26x5” or 27.5x4.5”
          • Dually 29x45 and 27.5x45 Rims – Max tire width: 3”
          • All rims 65mm to 85mm wide are compatible with tire widths of 3.8” to 5”
          • HED Carbon 100mm Rims – Max tire width of 4.6”

            ASSEMBLY

            If you choose "No Assembly" your bike will require complete assembly with an exception of the wheels. 

            If you choose "Assembled by Borealis", there is some assembly required upon receipt. Your bike will be completely assembled and tuned by Borealis, then partially disassembled for shipment. The remaining assembly will require installation of the rear derailleur, chain, fork, seat post, wheels, and handlebars. A multi-tool will be included with your order that has all tools necessary to assemble the bike, with the exception of a torque wrench. If you are not familiar with this level of assembly, we recommend having your local bike shop complete the assembly. Below is a video showing the remaining assembly once you receive the bike.

            Assembly Video 

             

            WHEELS & TIRES

            • All bikes come standard with tubes.
            • If you order rim tape with your Mulefut rims, we will tape the rims and install the tires with tubes.
            • HED Alloy and HED Carbon rims do not require rim tape for tubeless set up.
            • Tubes must be removed and tubeless valves installed for tubeless set up. We recommended to have this completed by a professional bicycle mechanic.

               

              SIZE CHART

              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.

               

               

              BUILD SPECS

              Frame Flume (Aluminum)
              Fork Borealis Carbon Rigid Fork Standard Option
              Bottom Bracket SRAM DUB 100mm
              Crankset SRAM Eagle NX Alloy 175mm w/ SRAM X-SYNC 30T SRAM Eagle GX Alloy 175mm w/ SRAM X-SYNC 30T SRAM Eagle X0 Carbon 175mm w/ SRAM X-SYNC 30T SRAM Eagle XX Carbon 175mm w/ SRAM X-SYNC 30T
              Rear Derailleur SRAM Eagle NX 12 Speed SRAM Eagle GX 12 Speed SRAM Eagle X0 12 Speed SRAM Eagle XX 12 Speed
              Chain Eagle GX Eagle GX Eagle GX Eagle XX Gold
              Cassette PG 1230 11-50 XG 1275 10-52 XG 1295 10-52 XG 1299 10-52
              Shifter SRAM Eagle NX SRAM Eagle GX SRAM Eagle GX SRAM Eagle GX
              Brakes SRAM Level T 2-piston OR SRAM G2 RS 4-Piston Hydraulic
              Rotors SRAM Centerline 160mm
              Headset FSA
              Hubs Borealis GEN 4 Black 15x150 Front / 12x197 Rear
              Rims Sun Ringle Mulefut V2 26x80 or 27.5x65
              Spokes Borealis Straight Gauge
              Nipples Borealis Silver Brass
              Tires Your Choice
              Bar Borealis Carbon 35x760mm
              Stem Borealis 50mm
              Post Borealis Carbon 31.6x400mm
              Saddle Borealis
              Grips Ergon GP10
              DT/CS Protector Lizard Skins
              Weight See weight calculator for estimated weight.

              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.

                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
              CHAINSTAY 459 mm 459 mm 459 mm 459 mm
              BB DROP 60 mm 60 mm 60 mm 60 mm
              REACH 407 mm 423 mm 438 mm 451 mm
              STACK 597 mm 611 mm 625 mm 639 mm

               

              OWNER'S MANUAL

              Download Owner's Manual

               

               

              PO boxes not accepted. Shipping discounts or exclusions only apply within the lower 48 states of the US. Contact us if damage occurs during shipping. 

              Borealis offers a 30-day money-back guarantee. If you are unsatisfied with your purchase for any reason, you can cancel, exchange, or return your product for a full refund, minus any associated transaction fees and shipping costs. Customer is responsible for return shipping costs. Returned and exchanged items must be in sellable condition. Affirm transactions are subject to a 10% non-refundable transaction fee.

               

               

              $2,199.00

               



              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.

              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.

               

               

               

               

                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
              CHAINSTAY 459 mm 459 mm 459 mm 459 mm
              BB DROP 60 mm 60 mm 60 mm 60 mm
              REACH 407 mm 423 mm 438 mm 451 mm
              STACK 597 mm 611 mm 625 mm 639 mm

               

               

               

               


               

              Wheel / Tire Size 26 x 3.8–5.0" on up to a 100mm rim / 27.5 x 2.8-4.5 on up to a 82mm rim / 29 x 2.25–3.0
              Susp Fork Travel 100-120mm
              Fork Offset 51mm
              Headset-Upper IS41
              Headset-Lower IS52
              Seatpost ø31.6mm
              Seat Collar ø34.9mm
              Dropper Compatible Internal - 125mm for SM & MD / 150mm for LG & XL
              Front Derailleur Type Compatible
              Bottom Bracket 100mm Threaded BSA 
              Crankset (Max Ring) Chainline 76mm / 1x (34t)
              Rear Brake (Rotor) 74mm post (160–180mm)
              Rear Spacing 197 x 12mm thru-axle
              Rear Axle ø12 x 229L, TP= 1.5, TL = 20
              Derailleur Hanger Borealis Custom
              Bottle Mount  SM : 2 (downtube) / MD, SM, XL: 3 (downtube & seatube)
              Rear Rack Reccomendation Old Man Mountain Divide Fat 
              Rear Rack Mounts, Upper None
              Axle to Crown 487mm
              Steerer Tube Size 28.6mm
              Steerer Style Tapered
              Crown Seat Diameter 40mm

               

               

               

              $1,000.00

               



              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.

              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.

               

               

               

               

                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
              CHAINSTAY 459 mm 459 mm 459 mm 459 mm
              BB DROP 60 mm 60 mm 60 mm 60 mm
              REACH 407 mm 423 mm 438 mm 451 mm
              STACK 597 mm 611 mm 625 mm 639 mm

               

               

               

               


               

              Wheel / Tire Size 26 x 3.8–5.0" on up to a 100mm rim / 27.5 x 2.8-4.5 on up to a 82mm rim / 29 x 2.25–3.0
              Susp Fork Travel 100-120mm
              Fork Offset 51mm
              Headset-Upper IS41
              Headset-Lower IS52
              Seatpost ø31.6mm
              Seat Collar ø34.9mm
              Dropper Compatible Internal - 125mm for SM & MD / 150mm for LG & XL
              Front Derailleur Type Compatible
              Bottom Bracket 100mm Threaded BSA 
              Crankset (Max Ring) Chainline 76mm / 1x (34t)
              Rear Brake (Rotor) 74mm post (160–180mm)
              Rear Spacing 197 x 12mm thru-axle
              Rear Axle ø12 x 229L, TP= 1.5, TL = 20
              Derailleur Hanger Borealis Custom
              Bottle Mount  SM : 2 (downtube) / MD, SM, XL: 3 (downtube & seatube)
              Rear Rack Reccomendation Old Man Mountain Divide Fat 
              Rear Rack Mounts, Upper None
              Axle to Crown 487mm
              Steerer Tube Size 28.6mm
              Steerer Style Tapered
              Crown Seat Diameter 40mm

               

               

               

              $1,000.00
              Crestone (Carbon) -  X-Large Midnight Blue & Bronze XX1 Gold (Brand New Special)
              • Sale

              Special Offer Brand New:

              Crestone XL 6'2"-6'5"

              Midnight Blue Frame & Bronze Graphics

              Manitou Mastodon Pro EXT 120mm Suspension Fork

              SRAM XX1 Gold 12 Speed Drivetrain

              SRAM G2 RS 4-Piston Brakes

              Rigid Carbon Seat Post 

              SunRingle Mulefut 27.5x65 Rims with Borealis Hubs

              Maxxis Minion 27.5x3.8" 120TPI Tires

              Frame Crestone (Carbon) Metallic Midnight Blue & Bronze
              Fork Manitou Mastodon Pro EXT 120mm
              Bottom Bracket SRAM DUB Threaded 100mm
              Crankset SRAM Eagle XX1 Carbon 175mm w/ SRAM X-SYNC 30T
              Rear Derailleur SRAM Eagle XX1 12-Speed
              Chain SRAM EAGLE XX1 GOLD
              Cassette SRAM XG-1299 10-50T Gold
              Shifter SRAM Eagle XX1 12-Speed
              Brakes SRAM G2 RS 4-Piston Hyrdraulic with SRAM Centerline 180/160mm Rotors
              Headset FSA
              Hubs Borealis GEN 4 Black 15x150 Front / 12x197 Rear
              Rims Sun Ringle Mulefut V2 27.5x65
              Spokes Borealis Straight Gauge
              Nipples Borealis Silver Brass
              Tires Maxxis Minion FBF/FBR 27.5x3.8
              Bar Borealis Carbon Matte
              Stem Borealis 50mm x 35mm
              Post Borealis Rigid Carbon 31.6 x 400mm Matte
              Saddle Borealis
              Grips Borealis Wing
              DT/CS Protector Lizard Skins
              Included Tubes
              MSRP $3,949 
              $2,999.00
            • -24%
            • $3,949.00
              Crestone (Carbon) -  X-Large Midnight Blue & Bronze XX1 Gold (Brand New Special)
              • Sale

              Special Offer Brand New:

              Crestone XL 6'2"-6'5"

              Midnight Blue Frame & Bronze Graphics

              Manitou Mastodon Pro EXT 120mm Suspension Fork

              SRAM XX1 Gold 12 Speed Drivetrain

              SRAM G2 RS 4-Piston Brakes

              Rigid Carbon Seat Post 

              SunRingle Mulefut 27.5x65 Rims with Borealis Hubs

              Maxxis Minion 27.5x3.8" 120TPI Tires

              Frame Crestone (Carbon) Metallic Midnight Blue & Bronze
              Fork Manitou Mastodon Pro EXT 120mm
              Bottom Bracket SRAM DUB Threaded 100mm
              Crankset SRAM Eagle XX1 Carbon 175mm w/ SRAM X-SYNC 30T
              Rear Derailleur SRAM Eagle XX1 12-Speed
              Chain SRAM EAGLE XX1 GOLD
              Cassette SRAM XG-1299 10-50T Gold
              Shifter SRAM Eagle XX1 12-Speed
              Brakes SRAM G2 RS 4-Piston Hyrdraulic with SRAM Centerline 180/160mm Rotors
              Headset FSA
              Hubs Borealis GEN 4 Black 15x150 Front / 12x197 Rear
              Rims Sun Ringle Mulefut V2 27.5x65
              Spokes Borealis Straight Gauge
              Nipples Borealis Silver Brass
              Tires Maxxis Minion FBF/FBR 27.5x3.8
              Bar Borealis Carbon Matte
              Stem Borealis 50mm x 35mm
              Post Borealis Rigid Carbon 31.6 x 400mm Matte
              Saddle Borealis
              Grips Borealis Wing
              DT/CS Protector Lizard Skins
              Included Tubes
              MSRP $3,949 
              $2,999.00
            • -24%
            • $3,949.00
              Crestone (Carbon) -  X-Large White Blue & Black XX1 Gold (Brand New Special)
              • Sale

              Special Offer Brand New:

              Crestone XL 6'2"-6'5"

              White Blue & Black

              Manitou Mastodon Pro EXT 120mm Suspension Fork

              SRAM XX1 Gold 12 Speed Drivetrain

              SRAM G2 RS 4-Piston Brakes

              Rigid Carbon Seat Post 

              SunRingle Mulefut 27.5x65 Rims with Borealis Hubs

              Maxxis Minion 27.5x3.8" 120TPI Tires

              Frame Crestone (Carbon) White Blue & Black
              Fork Manitou Mastodon Pro EXT 120mm
              Bottom Bracket SRAM DUB Threaded 100mm
              Crankset SRAM Eagle XX1 Carbon 175mm w/ SRAM X-SYNC 30T
              Rear Derailleur SRAM Eagle XX1 12-Speed
              Chain SRAM EAGLE XX1 GOLD
              Cassette SRAM XG-1299 10-50T Gold
              Shifter SRAM Eagle XX1 12-Speed
              Brakes SRAM G2 RS 4-Piston Hyrdraulic with SRAM Centerline 180/160mm Rotors
              Headset FSA
              Hubs Borealis GEN 4 Black 15x150 Front / 12x197 Rear
              Rims Sun Ringle Mulefut V2 27.5x65
              Spokes Borealis Straight Gauge
              Nipples Borealis Silver Brass
              Tires Maxxis Minion FBF/FBR 27.5x3.8
              Bar Borealis Carbon Matte
              Stem Borealis 50mm x 35mm
              Post Borealis Rigid Carbon 31.6 x 400mm Matte
              Saddle Borealis
              Grips Borealis Wing
              DT/CS Protector Lizard Skins
              Included Tubes
              MSRP $3,949 
              $2,999.00
            • -24%
            • $3,949.00
              Crestone (Carbon) -  X-Large White Blue & Black XX1 Gold (Brand New Special)
              • Sale

              Special Offer Brand New:

              Crestone XL 6'2"-6'5"

              White Blue & Black

              Manitou Mastodon Pro EXT 120mm Suspension Fork

              SRAM XX1 Gold 12 Speed Drivetrain

              SRAM G2 RS 4-Piston Brakes

              Rigid Carbon Seat Post 

              SunRingle Mulefut 27.5x65 Rims with Borealis Hubs

              Maxxis Minion 27.5x3.8" 120TPI Tires

              Frame Crestone (Carbon) White Blue & Black
              Fork Manitou Mastodon Pro EXT 120mm
              Bottom Bracket SRAM DUB Threaded 100mm
              Crankset SRAM Eagle XX1 Carbon 175mm w/ SRAM X-SYNC 30T
              Rear Derailleur SRAM Eagle XX1 12-Speed
              Chain SRAM EAGLE XX1 GOLD
              Cassette SRAM XG-1299 10-50T Gold
              Shifter SRAM Eagle XX1 12-Speed
              Brakes SRAM G2 RS 4-Piston Hyrdraulic with SRAM Centerline 180/160mm Rotors
              Headset FSA
              Hubs Borealis GEN 4 Black 15x150 Front / 12x197 Rear
              Rims Sun Ringle Mulefut V2 27.5x65
              Spokes Borealis Straight Gauge
              Nipples Borealis Silver Brass
              Tires Maxxis Minion FBF/FBR 27.5x3.8
              Bar Borealis Carbon Matte
              Stem Borealis 50mm x 35mm
              Post Borealis Rigid Carbon 31.6 x 400mm Matte
              Saddle Borealis
              Grips Borealis Wing
              DT/CS Protector Lizard Skins
              Included Tubes
              MSRP $3,949 
              $2,999.00
            • -24%
            • $3,949.00