Fatboy SL

The smartest fat bike build you can buy. By combining our lightweight M4 alloy Fatboy frame with carbon where it really counts, we've delivered a bike that shaves considerable weight off the competition at a price that makes this accessible.

The smartest fat bike build you can buy. By combining our lightweight M4 alloy Fatboy frame with carbon where it really counts, we've delivered a bike that shaves considerable weight off the competition at a price that makes this accessible.

Part No:
    • FRAME

      Specialized M4 Premium Aluminum, fully butted w/ smooth welds, tapered headtube, post-mount disc dropouts, 190mm rear hub spacing, replaceable alloy derailleur hanger

    • FORK

      Specialized FACT carbon, full monocoque, tapered steerer, 135mm hub spacing, open QR dropouts

    • HEADSET

      1-1/8" upper, 1-1/2" lower, Campy style, integrated sealed cartridge bearings

    • STEM

      Specialized Stout XC, 3D forged alloy, 4-bolt, 6-degree rise, anti-corriosion hardware

    • HANDLEBARS

      Specialized flat, carbon, 8-degree backsweep, 31.8mm

    • GRIPS

      Specialized Sip Grip, light lock-on, half-waffle, S/M: regular thickness, Others: XL

    • FRONT BRAKE

      Magura MT8, hydraulic disc, Hi Friction pad, carbon master cylinder, alloy caliper, Storm SL rotor

    • REAR BRAKE

      Magura MT8, hydraulic disc, Hi Friction pad, carbon master cylinder, alloy caliper, Storm SL rotor

    • BRAKE LEVERS

      Magura MT8, carbon lever

    • REAR DERAILLEUR

      SRAM XX1, 11-speed, carbon cage

    • SHIFT LEVERS

      SRAM XX1, 11-speed, trigger

    • CASSETTE

      SRAM XX1, 11-speed, 10-42

    • CHAIN

      KMC X11L, 11-speed, w/ reusable MissingLink

    • CRANKSET

      Race Face Next SL, PF30 BB, 100mm spindle, 30T, spiderless

    • PEDALS

      Alloy, 1 pc. body, 9/16", w/ reflectors

    • RIMS

      HED Big Deal, carbon, single wall, tubeless, 85mm wide, 32h

    • FRONT HUB

      Specialized Stout XC 135, Hi Lo disc, alloy, sealed cartridge bearings, QR, 32h

    • REAR HUB

      Specialized Stout XC 190, Hi Lo disc, alloy, sealed cartridge bearings, QR, 32h

    • SPOKES

      Stainless, butted, 2.0/1.8/2.0mm, black

    • FRONT TIRE

      Specialized Ground Control Fat, 120TPI, folding bead, 26x4.6"

    • REAR TIRE

      Specialized Ground Control Fat, 120TPI, folding bead, 26x4.6"

    • INNER TUBES

      Standard, presta valve

    • SADDLE

      Body Geometry Phenom Expert, hollow Ti rails, 143mm

    • SEATPOST

      S-Works FACT carbon, 20mm offset, 27.2mm

    • SEAT BINDER

      Alloy, 31.6mm

    Specifications subject to change without notice.

  • Fully butted M4 Premium Aluminum frame is lightweight and stiff
  • Specialized FACT carbon fork w/ 5-inch tire clearance for stiff handling
  • HED Big Deal Carbon rims for super light and stiff wheels that are tubeless compatible
  • Specialized Ground Control 4.6-inch tires roll over anything
  • Race Face Next SL carbon crankset with SRAM XX1 1x11 components provides an incredibly light and efficient drivetrain
Loading Map...

Please contact your Specialized retailer to confirm availability.

Fatboy SL

Part No:

Sorry, no dealers were found within the specified radius and store features.

Checking available inventory...

Geometry

  S M L XL
Seat Tube Length, Center to Top 394mm 445mm 483mm 533mm
Top Tube Length (Horizontal) 576mm 603mm 625mm 650mm
Chainstay Length 455mm 455mm 455mm 455mm
Bottom Bracket Drop 60mm 60mm 60mm 60mm
Bottom Bracket Height 315mm 315mm 315mm 315mm
Head Tube Length 110mm 120mm 135mm 150mm
Head Tube Angle 70.5° 70.5° 70.5° 70.5°
Seat Tube Angle (Actual) 73° 73° 73° 73°
Seat Tube Angle (Effective) 73° 73° 73° 73°
Wheel Base 1083mm 1105mm 1128mm 1154mm
Stack 590mm 600mm 615mm 629mm
Reach 395mm 420mm 437mm 458mm
Handle-Bar Width 750mm 750mm 750mm 750mm
Stem Length 60mm 60mm 70mm 70mm
Crank Length 170mm 175mm 175mm 175mm
Seat-Post Length 100mm 400mm 400mm 400mm
Standover Height 757mm 793mm 820mm 849mm

  • Seat Tube Length, Center to Top 394mm
    Top Tube Length (Horizontal) 576mm
    Chainstay Length 455mm
    Bottom Bracket Drop 60mm
    Bottom Bracket Height 315mm
    Head Tube Length 110mm
    Head Tube Angle 70.5°
    Seat Tube Angle (Actual) 73°
    Seat Tube Angle (Effective) 73°
    Wheel Base 1083mm
    Stack 590mm
    Reach 395mm
    Handle-Bar Width 750mm
    Stem Length 60mm
    Crank Length 170mm
    Seat-Post Length 100mm
    Standover Height 757mm
    View S Geometry
  • Seat Tube Length, Center to Top 445mm
    Top Tube Length (Horizontal) 603mm
    Chainstay Length 455mm
    Bottom Bracket Drop 60mm
    Bottom Bracket Height 315mm
    Head Tube Length 120mm
    Head Tube Angle 70.5°
    Seat Tube Angle (Actual) 73°
    Seat Tube Angle (Effective) 73°
    Wheel Base 1105mm
    Stack 600mm
    Reach 420mm
    Handle-Bar Width 750mm
    Stem Length 60mm
    Crank Length 175mm
    Seat-Post Length 400mm
    Standover Height 793mm
    View M Geometry
  • Seat Tube Length, Center to Top 483mm
    Top Tube Length (Horizontal) 625mm
    Chainstay Length 455mm
    Bottom Bracket Drop 60mm
    Bottom Bracket Height 315mm
    Head Tube Length 135mm
    Head Tube Angle 70.5°
    Seat Tube Angle (Actual) 73°
    Seat Tube Angle (Effective) 73°
    Wheel Base 1128mm
    Stack 615mm
    Reach 437mm
    Handle-Bar Width 750mm
    Stem Length 70mm
    Crank Length 175mm
    Seat-Post Length 400mm
    Standover Height 820mm
    View L Geometry
  • Seat Tube Length, Center to Top 533mm
    Top Tube Length (Horizontal) 650mm
    Chainstay Length 455mm
    Bottom Bracket Drop 60mm
    Bottom Bracket Height 315mm
    Head Tube Length 150mm
    Head Tube Angle 70.5°
    Seat Tube Angle (Actual) 73°
    Seat Tube Angle (Effective) 73°
    Wheel Base 1154mm
    Stack 629mm
    Reach 458mm
    Handle-Bar Width 750mm
    Stem Length 70mm
    Crank Length 175mm
    Seat-Post Length 400mm
    Standover Height 849mm
    View XL Geometry