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Specialized Fatboy Pro

Specialized Fatboy 2015

Fat Bike

At a glance

The 2015 Specialized Fatboy Pro is an Fat Bike mountain bike. It sports 26" wheels, has RockShox suspension and a SRAM drivetrain. The bike is part of Specialized's Fatboy range of mountain bikes.

All the fun of a fat bike with the performance of a Specialized. The Fatboy Pro combines a lightweight frame, RockShox Bluto fork, and 4.6 Ground Control tyres to create a geometry similar to Specialized 29er geometry for nimble handling in the most extreme conditions.

Where To Buy



  • 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
    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
  • Hubs
    Front: Specialized Hi Lo disc, sealed cartridge bearings, 15mm thru-axle, 150mm wide, 32h
    Rear: Specialized Hi Lo disc, alloy, sealed cartridge bearings, XD driver body, 190mm wide, QR, 32h
  • Wheels
    Specialized Fatboy SL, alloy disc, single wall, 90mm wide, sleeve joint, hookless design, 32h
  • Wheel Size
  • Spokes
    Stainless, 2.0/1.8/2.0mm
  • Tires
    Front: Specialized Ground Control Fat, 120TPI, folding bead, 26x4.6""
    Rear: Specialized Ground Control Fat, 120TPI, folding bead, 26x4.6""
  • Chain
    KMC X11L, 11-speed, reusable Missing Link
  • Crank
    Race Face Next SL, PF30 BB, 100mm spindle, 30T, spiderless
  • Rear Derailleur
    SRAM X01, 11-speed, carbon cage
  • Shifters
    SRAM X01,11-speed, trigger
  • Cassette
    SRAM X1, 11-speed, 11-42
  • Pedals
    Specialized Bennies, 6061 alloy body, sealed cartridge bearings, 4.5mm removable pins
  • Brakeset
    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
  • Handlebar
    Specialized Mini-rise, 7050 alloy, 8-backsweep, 6-upsweep, 10mm rise, 720mm width, 31.8mm clamp
  • Saddle
    Body Geometry Henge Sport, steel 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
  • Stem
    Specialized Stout, 3D-forged alloy, 4-bolt, 6-degree rise, anti-corrosion hardware


Q: What size wheels does the 2015 Specialized Fatboy Pro have?

The 2015 Specialized Fatboy Pro has 26" wheels.

Q: What size 2015 Specialized Fatboy Pro should I get?

After measuring your height, use the size chart below to find the typical Specialized Fatboy Pro size for your height. Remember that these sizes are a general guide and bike sizes can vary between riders and bikes. The best way to find your size is to go for a test ride.

Rider Height (cm) Rider Height (in) Frame Size
148cm - 158cm 4'10" - 5'2" XS
158cm - 168cm 5'2" - 5'6" S
168cm - 178cm 5'6" - 5' 10" M
178cm - 185cm 5'10" - 6'1" L
185cm - 193cm 6'1" - 6'4" XL
193cm - 198cm 6'4" - 6'6" XXL


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