Skip to content
CARBRANDLOGOS
1990 Harley-Davidson Fat Boy

CarBrandLogos archive · Harley-Davidson · 1990

Harley-DavidsonFat Boy

Solid disc wheels, a silver tank, and a shape everyone knows from one film.

Discover the story

Photo: Nitot · CC BY-SA 4.0

A defining chapter in Harley-Davidson history.

Explore the ideas, engineering and context that shaped the Harley-Davidson Fat Boy, then continue into its specifications and place in the marque's lineage.

FLSTFB Fat Boy

01

Origins

Willie G. Davidson's design for 1990 did one thing that made the whole motorcycle: solid disc wheels front and rear. Spoked wheels had been the default for so long that a Harley with unbroken discs looked heavy, deliberate and slightly menacing, and the shape has been recognisable at a distance ever since. It sat on the Softail chassis, which hides its rear suspension beneath the gearbox so the bike reads as a rigid-framed machine from the 1940s while riding like a modern one.

FLSTFB Fat Boy · Thruxton · CC BY-SA 4.0

Harley Davidson FAT BOY 114

02

Design and engineering

Two years later Arnold Schwarzenegger rode one through Terminator 2, and the Fat Boy stopped needing any marketing at all. It became the bike non-riders picture when they hear the word Harley.

Harley Davidson FAT BOY 114 · Terragio67 · CC BY-SA 4.0

03

In production

Mechanically it has followed the company's engine development throughout: the 1340 cc Evolution to 1999, the Twin Cam in several capacities to 2017, and the Milwaukee-Eight since 2018, with belt final drive throughout. It has been in the range continuously since 1990, which for a cruiser built largely on the strength of its looks is a considerable run.

The facts that define it.

Engine

Harley-Davidson Evolution engine
Harley Davidson FAT BOY 114

The Fat Boy, in detail.

Production
Since 1990
Class
Cruiser
Engine
Harley-Davidson Evolution engine; Evolution (1990–1999); 1340 cc ; Harley-Davidson Twin Cam engine; Twin Cam (2000–2017); 1450 cc ; 1584 cc ; 1690 cc ; Harley-Davidson Milwaukee-Eight engine; Milwaukee-Eight (2018–2019);
Transmission
Chain (Primary) / Belt (final drive)
Manufacturer
Harley-Davidson