2018 Specialized Fatboy 20

Mid-range component level aluminum frame fatbike bike


2018 Specialized Fatboy 20
  • MSRP $770
  • Suspension Rigid
  • Frame Aluminum
  • Fork Aluminum
  • Wheels 20″ Aluminum
  • Drivetrain 1 × 9
  • Groupset 
    SRAM X4
  • Brakes Mechanical Disc

1 × 9 — 9 speed

2018 Specialized Fatboy 20
15 mph
Similar Bikes
26 mph

The 2018 Fatboy 20 is easier to ride up hills than similar bikes.

The 2018 Fatboy 20 won‘t keep up with similar bikes while riding downhill or sprinting.

Estimated Spec Level
est. spec level →$0$200$400$600$800$1,000$1,200
This bike
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Estimated spec level of the Fatboy 20 compared to other fatbike bikes. 99 Spokes analyzes the build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more to estimate the overall spec level of each bike.  Learn more »

FrameFully butted Specialized A1 Premium Aluminum, ZeroStack head tube, 100mm-wide threaded bottom bracket, 170mm rear hub spacing
ForkSpecialized A1 Premium Aluminum, 1-1/8"" alloy steerer
Bottom BracketSquare taper, 100x151.5mm, sealed bearings
StemAlloy, 7-degree rise, 31.8mm clamp
HandlebarSpecialized, alloy, 9-degree backsweep, 4-degree upsweep, 680mm width, 31.8mm
SaddleSpecialized Youth, steel rails
SeatpostAlloy, single-bolt, 27.2mm
GripsSpecialized Body Geometry XCT, lock-on
Rear DerailleurSRAM X4, long cage, 6-/7-/8-speed
ShiftersSRAM, trigger, 9-speed
CassetteSunrace, 9-Speed, 11-36t
ChainKMC X9, 9-speed w/ reusable MissingLink™
BrakesTektro Aries, mechanical disc, organic pads, 160mm rotor
Rims20"" disc, alloy construction, 68mm internal width, 32h
SpokesStainless, 14g
Front HubStout 135, loose ball bearings, 10x135 QR, 32h
Rear HubStout 170, loose ball bearings, 9-/10-speed cassette body, 10x170mm QR, 32h
TiresGround Control Fat, 60 TPI, wire bead, 20x4.0""
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2018 Specialized Fatboy 20