Specialized Fatboy

Name: Specialized Fatboy
Brand: Specialized

2020 MountainFat bike Manufacturer page

Last known price: $1,875

Prices shown first for United States
Suspension: Rigid
Wheels: 27.5″
Drivetrain: 1 × 12 30t
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 158–171
MD 168–180
LG 178–189
XL 186–199

Components

11 of 17 identified

Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.

Frame and fork

1 part

Frame

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 Not identified

Suspension

1 part

Fork
- Specialized

Drivetrain

4 parts

Brakes

1 part

Brakes
- SRAM Level T

Wheels and tires

5 parts

Front hub

Stout Pro 150, sealed cartridge bearings, 6-bolt disc, 15x150mm, 32h Not identified
Rear hub

Stout Pro 197, sealed cartridge bearings, 6-bolt disc, 12x197mm, 32h Not identified
Rims

Stout XC 80, 27.5", alloy, 76mm internal width, disc-specific, tubeless ready Not identified
Spokes

Stainless, 14g Not identified
Tires
- Maxxis Minion

Cockpit and contact points

5 parts

Grips
- Specialized
Handlebar

Stout Riser, double-butted alloy, 9-degree backsweep, 5-degree upsweep, 15mm rise, 750mm / 780mm width, 31.8mm Not identified
Saddle
- Specialized
Seatpost
- Specialized
Stem
- Specialized

Sizes and geometry

4 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 420mm

Stack 602mm

Wheelbase 1113mm

Head angle 71.0°

Seat angle 73.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 27.5″ wheel; exact published values are in the table below.

Size Reported by the manufacturer

Complete manufacturer geometry table 4 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	395	420	437	458
Stackmm	602	602	617	632
Top tube lengthmm	579	604	626	651
Seat tube lengthmm	394	434	470	520
Head tube lengthmm	94	94	110	125
Head tube angle	71°	71°	71°	71°
Seat tube angle	73°	73°	73°	73°
Chainstay lengthmm	455	455	455	455
Wheelbasemm	1088	1113	1135	1161
Front centermm	640	665	687	713
Bottom bracket dropmm	60	60	60	60
Bottom bracket heightmm	312	312	312	312
Standover heightmm	765	786	813	847
Fork rakemm	47	47	47	47
Trailmm	83	83	83	83
Stack/reach ratio	1.52	1.43	1.41	1.38
Suspension and parts
Crank lengthmm	170	175	175	175
Handlebar widthmm	750	750	750	750
Stem lengthmm	60	60	70	70
Seatpost lengthmm	350	350	400	400

Not published by the manufacturer: Front travel, Rear travel, Stem angle and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Aluminum
Fork material: Carbon

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 30
Largest chainring: 30
Rear sprockets: 12

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Tire width: 3.8″
Travel: Front: Additional specification: Not available: Yes
Rear: Additional specification: Not available: Yes
Wheel material: Aluminum
Wheel size: 27.5″

Lineup changes

The published facts that differ across this family's builds and from the same model a year earlier. Missing information never counts as zero.

Differences across 2020 builds
Specification	This bicycle Specialized Fatboy	Specialized Fatboy 20	Specialized Fatboy 24	Specialized Fatboy Comp Carbon	Specialized Fatboy SE
Frame
Frame material	Aluminum	Aluminum	Aluminum	Carbon	Aluminum
Fork material	Carbon	Aluminum	Aluminum	Carbon	Aluminum
Drivetrain
Smallest chainring	30	32	32	30	28
Largest chainring	30	32	32	30	28
Rear sprockets	12	9	9	12	10
Smallest sprocket	Not informed	11	11	10	11
Largest sprocket	Not informed	36	36	50	42
Lowest gear	Not informed	17.8 in	21.3 in	16.5 in	17.3 in
Highest gear	Not informed	58.2 in	69.8 in	82.5 in	66.2 in
Brakes
Brake type	Hydraulic disc	Mechanical disc	Mechanical disc	Hydraulic disc	Mechanical disc
Other specifications
Tire width	3.8″	4″	4″	3.8″	4.6″
Wheel size	27.5″	20″	24″	27.5″	26″
Bottom bracket standard	Not informed	Not informed	Not informed	PF30	BSA

Changes since 2019
Specification	2019 Specialized Fatboy	This bicycle Specialized Fatboy
Drivetrain
Smallest chainring	28	30
Largest chainring	28	30
Rear sprockets	11	12
Smallest sprocket	11	Not informed
Largest sprocket	42	Not informed
Lowest gear	17.3 in	Not informed
Highest gear	66.2 in	Not informed
Other specifications
Bottom bracket standard	BSA	Not informed
Tire width	4.6″	3.8″
Wheel size	26″	27.5″