Harley Davidson Softail Fat Boy


Make Model

Harley Davidson Softail Fat Boy


Engine Four stroke, V-Twin, Milwaukee-Eight 107, Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters, 4 valves per cylinder
Capacity 1746 cc / 107 cub in
Bore x Stroke 100 x 111 mm
Cooling System Air cooled
Compression Ratio 10.0:1
Exhaust 2-into-2 staggered; catalyst in muffler
Induction Electronic Sequential Port Fuel Injection (ESPFI)
Lubrication Pressurized, dry-sump with oil cooler
Ignition  Single-fire, non-wasted, map-controlled spark ignition
Starting Electric
Max Torque 148 Nm / 109 ft-lb @ 3000 rpm
Clutch Multi-plate, wet


6 Speed 
Primary Drive Chain, 34/46 ratio
Final Drive Belt
Gear Ratio 1st 9.311 / 2nd 6.454 / 3rd 4.793 / 4th 3.882 / 5th 3.307 / 6th 2.79

Lean Angle, Left


Lean Angle, Right


Front Suspension

Showa Inverted forks

Rear Suspension

Mono shock adjustable

Front Brakes

2x Discs 4 piston caliper

Rear Brakes

Single disc 2 piston caliper
Front Wheel Machined, Lakester cast aluminum
Rear Wheel Machined, Lakester cast aluminum

Front Tyre


Rear Tyre

Rake (steering head) 30°
Trail 104 mm / 4.1 in
Dimensions Length  2370 mm / 93.3 in
Wheelbase 1655 mm / 65.6 in
Ground Clearance 115 mm / 4.5 in
Seat Height 675 mm / 26.4 in

Dry Weight

304 kg kg / 670 lbs

Wet Weight

317 kg / 699 lbs
Oil Capacity 4.7 Litres / 5.0 US qt

Fuel Capacity 

18.9 Litres / 5.0 US gal

The look of the Fat Boy® is more muscular than ever, thanks to all-new solid-disc wheels, and the 240mm rear tyre matched with a 160mm front. But now the Fat Boy® is 29lb lighter and benefits from the extra power of the Milwaukee-Eight® V-Twin engine.

The original fat custom icon that changed it all has done it again. Satin chrome finishes. Beefy 240mm rear tire. And now available in a Milwaukee-Eight® 107 or 114 Big Twin Engine for the most muscular, unstoppable Fat Boy® motorcycle ever.

It’s got all-new solid-disc wheels, a 240mm rear tire, and jaw-dropping satin chrome finishes.


You’ll feel the difference the first time you lift it up off its side stand, throw a leg over and hit the throttle. The ride will thrill you IT’LL STOP TRAFFIC WHEN YOU HIT THE STREETS

Harley-Davidson Softail Story – The next custom revolution

Authentic innovation meets true Harley-Davidson soul in the reinvented Softail® family. The most powerful, agile, and responsive cruisers in Harley-Davidson history feature a lighter and stiffer frame, high-performance suspension and the smooth, unrelenting torque of a fully counter-balanced Milwaukee-Eight® V-Twin engine. Each Softail® model has a distinctive look and attitude that stays true to the roots of Harley-Davidson® custom motorcycle design.

Two Limited Edition 115th Anniversary paint schemes will be available on select 2018 models.
The divergent styles will appeal to a broader audience of customers and, to add exclusivity to each model, all paint sets will be serialized.

NEW FOR 2018

The Milwaukee-Eight® 107 and 114 engines
34% stiffer chassis overall
Reduced weight
New Showa® SDBV® front suspension technology
High-performance rear monoshock


Satin Chrome Finishes
An all-you-can eat portion of sculpted satin chrome gives the Fat Boy® a look that’ll make a big impact.

Steamroller Stance
A muscular look thanks to all-new solid-disc Lakester wheels wrapped in the widest front tire we’ve ever offered from the factory at 160mm combined with a 240mm rear tire.

Milwaukee-Eight® Big Twin Engine
A powerful, smooth-running engine with crisp throttle response and a pure, soul-satisfying rumble. Available in 107 and 114 engine displacements.

Signature LED Forward Lighting
Darkness-defying lighting that give you greater visibility at night.

All-New Softail® Frame
A lighter, stiffer frame (compared to the prior Softail® and Dyna® models) that takes the idea of form and function to a place it’s never been before. It’s the look of a hard tail from a bygone era that delivers a thoroughly modern ride.

High Performance Front Suspension
New Showa® SDBV® suspension technology provides the performance of a racing-style cartridge fork for reduced weight with linear damping characteristics.

High Performance Rear Mono Shock
All-new easily adjustable mono-shock rear suspension allows for dynamic cornering capability while preserving the hardtail look.