Bicycle Archive · Specification report

2020 Specialized Fatboy

Velopedia Archive ID 900003862

Overview

Model year	2020
Brand	Specialized
Model	Fatboy
Bicycle type	Mountain
Archive ID	900003862
Original MSRP	$1,875.00
Colors	Satin Oak Green/Spruce/Hyper
Sizes	S; M; L; XL

Frameset

Frame construction	Specialized M5 Aluminum, fully butted w/ Smooth Welds, tapered head tube and seat tube, forged post-mount 160mm disc dropouts, internal routing, forged bottom bracket shell, 197x12mm rear thru-axle
Frame material	Aluminum
Fork	Specialized FACT carbon, 46mm offset, tapered steerer, 150mm axle
Fork material	Carbon Fiber

Drivetrain

Shifters	SRAM SX Eagle, trigger, 12-speed
Rear derailleur	SRAM SX Eagle, 12-speed
Crankset	SRAM X01 Eagle, DUB, 30T
Chain	SRAM SX Eagle, 12-speed w/ PowerLock®
Pedals	* Weights based on production painted frames as pictured. Actual weights will vary based on colorway, frame size, and component variation. Specifications are subject to change without notice.

Brakes

Brakes	(F) SRAM Level T, hydraulic disc, 200/180mm / (R) SRAM Level T, hydraulic disc, 180/160mm

Cockpit & contact points

Handlebar	Stout Riser, double-butted alloy, 9-degree backsweep, 5-degree upsweep, 15mm rise, 750mm / 780mm width, 31.8mm
Stem	Specialized, 3D-forged alloy, 4-bolt, 7-degree rise
Saddle	Specialized Bridge, size specific, 143/155
Seatpost	Specialized 2-bolt head, forged alloy, 8mm offset, micro-adjust, 30.9mm

Wheels & tires

Hubs	(F) Stout Pro 150, sealed cartridge bearings, 6-bolt disc, 15x150mm, 32h / (R) Stout Pro 197, sealed cartridge bearings, 6-bolt disc, 12x197mm, 32h
Rims	Stout XC 80, 27.5", alloy, 76mm internal width, disc-specific, tubeless ready
Spokes	Stainless, 14g
Front tire	Maxxis Minion FBF, 120 TPI, EXO, 27.5 x 3.8"
Rear tire	Maxxis Minion FBR, 120 TPI, EXO, 27.5 x 3.8"

Geometry · S

Seat tube	394 mm
Effective top tube	579 mm
Head tube	94 mm
Head-tube angle	71°
Seat-tube angle	73mm
Chainstay / rear center	455 mm
Wheelbase	1088 mm
Bottom-bracket drop	60 mm
Bottom-bracket height	312 mm
Reach	395 mm
Stack	602 mm
Fork offset / rake	47 mm
Front center	640 mm
Trail	83 mm
Fork length / axle-to-crown	496 mm
Seatpost length	350 mm
Crank length	170 mm
Stem length	60 mm
Handlebar width	750 mm

Geometry · M

Seat tube	434 mm
Effective top tube	604 mm
Head tube	94 mm
Head-tube angle	71°
Seat-tube angle	73mm
Chainstay / rear center	455 mm
Wheelbase	1113 mm
Bottom-bracket drop	60 mm
Bottom-bracket height	312 mm
Reach	420 mm
Stack	602 mm
Fork offset / rake	47 mm
Front center	665 mm
Trail	83 mm
Fork length / axle-to-crown	496 mm
Seatpost length	350 mm
Crank length	175 mm
Stem length	60 mm
Handlebar width	750 mm

Geometry · L

Seat tube	470 mm
Effective top tube	626 mm
Head tube	110 mm
Head-tube angle	71°
Seat-tube angle	73mm
Chainstay / rear center	455 mm
Wheelbase	1135 mm
Bottom-bracket drop	60 mm
Bottom-bracket height	312 mm
Reach	437 mm
Stack	617 mm
Fork offset / rake	47 mm
Front center	687 mm
Trail	83 mm
Fork length / axle-to-crown	496 mm
Seatpost length	400 mm
Crank length	175 mm
Stem length	70 mm
Handlebar width	750 mm

Geometry · XL

Seat tube	520 mm
Effective top tube	651 mm
Head tube	125 mm
Head-tube angle	71°
Seat-tube angle	73mm
Chainstay / rear center	455 mm
Wheelbase	1161 mm
Bottom-bracket drop	60 mm
Bottom-bracket height	312 mm
Reach	458 mm
Stack	632 mm
Fork offset / rake	47 mm
Front center	713 mm
Trail	83 mm
Fork length / axle-to-crown	496 mm
Seatpost length	400 mm
Crank length	175 mm
Stem length	70 mm
Handlebar width	750 mm

Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on October 26, 2026.