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2015 Specialized

Fatboy Pro

A 26″ aluminum frame hardtail fat bike with ultra high-end components.
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FrameAluminum
SuspensionHardtail
ForkRockShox Bluto RL
Wheels26″ Aluminum
Drivetrain1 × 11
GroupsetX01
BrakesShimano XT Hydraulic Disc
SeatpostDropper
Where to Buy
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Insights
Ride Feel

Based on frame geometry and build specs.

Handling
nimblestable
Fatboy Pro
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)

34 km/h

Fatboy Pro

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

None yet.

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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

BikeRadar
Specialized Fatboy Comp Carbon review

mai 2016 · Seb Stott

Despite a couple of component niggles, the Fatboy has huge potential to dominate any fat bike race. Buy if you want a fast, capable and well-appointed fatty to race with

Highs
  • Light, speedy, well finished and perfect for mile-munching

Lows
  • You'll want to switch the stock tyres for snow, 203mm rotors are overkill, gearing is a little narrow

Read Review

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

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

RockShox Bluto RL, Solo Air spring, TurnKey damping, tapered alloy steerer, external rebound adj. 32mm alloy stanchions w/ mag lowers, disc mount, QR 15mm thru-axle for 150mm hub spacing

Spring TypeAir

Bottom Bracket

PF30, 100mm, press-fit

Headset

1-1/8"" upper, 1-1/2"" lower, integrated Campy style, 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, mini rise, 7050 alloy, 8-backsweep, 6-upsweep, 10mm rise, 31.8mm

Saddle

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

Seatpost

Command Post BlackLite, alien head design, single bolt head, w/ remote adjust lever, 30.9mm, S: 100mm travel, M/L/XL: 125mm

TypeDropper

Pedals

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

Grips

Specialized Body Geometry XC Contour, Kraton w/ gel, lock-on, closed end

Groupset
Rear Derailleur

SRAM X01, 11-speed, carbon cage

Crank

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

Shifters

SRAM X01,11-speed, trigger

Cassette

SRAM X1, 11-speed, 11-42

Chain

KMC X11L, 11-speed, reusable Missing Link

Brakes

Front: Shimano XT, hydraulic disc, Ice Tech resin pads w/ fins, Ice Tech rotor, Rear: Shimano XT, hydraulic disc, Ice Tech resin pads w/ fins, Ice Tech rotor

TypeShimano XT Hydraulic Disc

Brake Levers

Shimano XT, 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 Hi Lo disc, sealed cartridge bearings, 15mm thru-axle, 150mm wide, 32h

Rear Hub

Specialized Hi Lo disc, alloy, sealed cartridge bearings, XD driver body, 190mm 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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