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2015 Specialized

Fatboy Expert

A 26″ aluminum frame rigid fat bike with high-end components.
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FrameAluminum
SuspensionRigid
ForkCarbon
Wheels26″ Aluminum
Drivetrain2 × 10
GroupsetX0, e*thirteen TRS Plus
BrakesShimano Deore Hydraulic Disc
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Insights
Ride Feel

Based on frame geometry and build specs.

Terrain
easyextreme
Handling
nimblestable
Fatboy Expert
Other Fat bikes
Gearing

A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

Lowest gear

(climbing)

41 km/h

Fatboy Expert

36 km/h

Similar Bikes

Highest gear

(descending)

Sizing
SM

158cm – 171cm

MD

168cm – 180cm

LG

178cm – 189cm

XL

186cm – 199cm

🐐 Estimated

Rider Fit Notes

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Reviews

Summary

The Specialized Fatboy is celebrated for its versatility and performance across various conditions, from snow to sand, making it a standout in the fatbike category. Its design emphasizes stability and traction, with features like wide tires and a carbon fork enhancing ride quality. While it excels in challenging terrains, some reviews note its handling could be more nimble in tight spaces.

Pros
  • Excellent performance on snow and sand due to wide tires

  • Lightweight and efficient design for a fatbike

  • Stable and comfortable ride with carbon fork

  • Encourages active outdoor play, especially among kids

  • Aggressive geometry for responsive handling

Cons
  • Less nimble in quick, tight singletrack due to long chainstays

  • Requires attention in high-speed corners and steep trails

  • Some components may need upgrading for optimal performance

Key Quotes
The Fatboy has certainly gone through the most drastic evolution, transforming from a Y-shaped BMX rig to a chopper-style beach cruiser to a high-performance fatbike.
BIKE Magazine logoBIKE Magazine
One of the fastest fatties out there
BikeRadar logoBikeRadar
There is something about the Specialized Fatboy 20 that makes children happy, even if it doesn’t make sense to adults.
Enduro Mountainbike Magazine logoEnduro Mountainbike Magazine

Feedback?

View all reviews

Enduro Mountainbike Magazine
Specialized Fatboy 20 Review: Kids Bike on Steroids

mars 2016 · Evan Phillips

Fatbikes are polarizing, especially for our kids. But are they any good for lightweight shredders? We find out with the Specialized Fatboy 20.

Read Review

BikeRadar
Specialized Fatboy Expert Carbon review

févr. 2016 · Josh Patterson

Featherweight fat bike with a hefty price tag. Buy if you’re looking for a worthy fat bike for endurance racing

Highs
  • Lightweight frame and wheelset, supple tires that perform well on hardpack/groomed trails

Lows
  • Pricey compared to the competition, long chainstays

Read Review

BIKE Magazine
Specialized Fatboy Expert review - BIKE

févr. 2015

We reviewed Specialized's Fatboy Expert on the frigid, snowy trails of Marquette, MI to see how it held up to proper winter conditions.

Read Review

Canadian Cycling Magazine
Specialized Fatboy 24 and Fatboy 20: Fat bikes for small riders

nov. 2014 · Canadian Cycling Magazine

Specialized Canada has announced that two fat bikes for young riders will be available in mid-December. Both the Specialized Fatboy 24 and Fatboy 20 will

Read Review

Mountain Bike Action
Bike Test: SPECIALIZED FATBOY EXPERT

nov. 2014 · MBA Action

Let's kick back and have some fun

Read Review

MTBR
Specialized Fatboy

mars 2014 · Francis Cebedo

Fatbiking is about fun, adventure, determination, accomplishment, and a little bit of insanity. Specialized has rolled all of this up into a nice package that makes me actually want to go out in 12 degree temperatures to ride in the snow. - Mtbr.com

Read Review

Geometry
Specs
Build
Frame

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

BB StandardPF30, 100mm, Press Fit

Fork

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

Bottom Bracket

PF30, 100mm, press-fit

Headset

1-1/8"" upper, 1-1/2"" lower, Campy style, integrated sealed cartridge bearings, split crown race, 3.8mm cone spacer

Stem

Specialized, 3D forged alloy, 4-bolt, 6-degree rise, anti-corrosion hardware

Handlebar

Specialized, low rise, double butted 6061 alloy, 9-degree backsweep, 5-degree upsweep, 15mm rise, 31.8mm

Saddle

Body Geometry mountain, hollow Cr-Mo rails, 143mm

Seatpost

Alloy, 2-bolt, 12.5mm offset, 30.9mm, anti-corrosion hardware

TypeRigid

Pedals

Specialized Bennies, 6061 alloy body, sealed cartridge, 4.5mm removable pins

Grips

SRAM, S-Series Grip Shift, 92mm

Groupset
Rear Derailleur

SRAM X0 Type 2, 10-speed, medium cage

Front Derailleur

SRAM X7, 2x10, low direct mount

Crank

Custom e.thirteen, TRS+, PF30, 100mm spindle, w/ BB, 104/64mm BCD spider

Shifters

SRAM S-Series, Grip Shift, 10-speed

Cassette

Sunrace, 10-speed, 11-36

Chain

KMC X10L, 10-speed, reusable Missing Link

Brakes

Front: Shimano Deore BR-M506, hydraulic disc, dual piston, resin pads, Rear: Shimano Deore BR-M506, hydraulic disc, dual piston, resin pads

TypeShimano Deore Hydraulic Disc

Brake Levers

Shimano Deore BL-M506, hydraulic, w/ reach adjust

Wheels
Rims

Specialized Fatboy SL, alloy disc, single wall, 90mm wide, sleeve joint, hookless design, 32h

Spokes

Stainless, 2.0/1.8/2.0mm

Front Hub

Specialized MTB Hi Lo disc, alloy, sealed cartridge bearings, 135mm wide, QR, 32h

Tires

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

Rider Notes
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First added 9 juillet

Last updated 9 juillet

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