Bicycle Archive · Specification report

2015 Specialized Fatboy 20

Velopedia Archive ID 1231968

Overview

Model year	2015
Brand	Specialized
Model	FATBOY 20
Bicycle type	Fat Bike
Archive ID	1231968
Original MSRP	$1,000.00
Colors	Satin Warm Charcoal/Teal/Hyper, Satin Coral/Deep Indigo/Powder Indigo/Powder Coral, Metallic White/Turqoise/Light Turqoise/Pink, Gloss Royal Blue/Moto Orange/Gallardo Orange
Sizes	One Size

Frameset

Frame construction	Specialized A1 Premium Aluminum, fully butted w/ smooth welds, ZeroStack headtube, 170mm rear hub spacing, replaceable alloy derailleur hanger
Frame material	Aluminum
Fork	Specialized A1 Premium Aluminum, 1-1/8" alloy steerer
Fork material	Aluminum

Drivetrain

Component group	Mountian mix
Shifters	SRAM X4, 9-speed, trigger
Front derailleur	None
Rear derailleur	SRAM X4, 9-speed, mid cage
Crankset	Forged alloy, 32T, w/ chainguard
Bottom bracket	Square taper, sealed cartridge bearings, 100mm shell, 164mm axle
Rear cogs	Sunrace, 9-speed, 11-34
Chain	KMC X9, 9-speed, reusable Missing Link
Pedals	Composite platform, w/ reflectors, 9/16"

Brakes

Brakes	Tektro Aries, mechanical disc, organic pads

Cockpit & contact points

Headset	1-1/8" threadless, ZeroStack, semi-cartridge bearings
Handlebar	Specialized flat, 6061 double butted alloy, 9-degree backsweep, 31.8mm
Stem	Specialized 3D forged alloy, 4-bolt, 7-degree rise
Saddle	Specialized youth, steel rails
Seatpost	Alloy, single bolt, 27.2mm

Wheels & tires

Rims	Specialized Fatboy, alloy disc, single wall, 90mm wide, sleeve joint, 32h
Spokes	Stainless, 14g, w/ brass nipple
Front tire	Specialized Ground Control Fat, 60TPI, wire bead, 20x4.0", Specialized Ground Control Fat, 60TPI, wire bead, 20x4.0"
Wheel size	20

Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on October 5, 2026.