2017 Harley-Davidson Dyna Fat Bob Specifications

Name: 2017 Harley-Davidson Dyna Fat Bob
Brand: Harley-Davidson

Custom / cruiser • Specs last verified 13 July 2026

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2017 Harley-Davidson Dyna Fat Bob Overview

For 2017, Harley-Davidson offers the Dyna Fat Bob as a custom / cruiser motorcycle with 1690 cc on tap. The 2017 Harley-Davidson Dyna Fat Bob is built around a Four stroke, V-Twin, Twin Cam 103° with integrated oil cooler engine, a compression ratio of 9.6:1. Out on the road, the Dyna Fat Bob delivers 132 Nm @ 3250 rpm of torque. In everyday use, the 2017 Dyna Fat Bob tips the scales at 321 kg, carries a 18 9 litres fuel tank, offers a seat height of Unladen 690 mm and spans a 1620 mm wheelbase. That's roughly 20.4 kg heavier than the average custom / cruiser motorcycle in our database. Every technical detail, from suspension travel to tyre sizes, is covered in the full 2017 Harley-Davidson Dyna Fat Bob spec sheet below.

2017 Dyna Fat Bob - Pros & Cons

Strengths

Fuel injection: No choke, no jetting, no altitude compensation to think about - fuel injection just works across a wider range of conditions than carburetion.
Accessible seat height: At just Unladen 690 mm, flat-footing at a stop is easy for most riders - a genuine confidence builder for less experienced owners.
Large fuel range: With a 18 9 litres tank, this isn't a bike you'll be stopping for fuel every hour - a real asset on longer trips.
Low-maintenance final drive: Belt final drive is about as close to maintenance-free as motorcycle drivetrains get.

Considerations

Age-related wear: No particular mechanical concern flags for the Dyna Fat Bob - condition on any used example comes down to how well it's been looked after.

Wear Points & Servicing Notes

Heat management in traffic

Air cooling on the Dyna Fat Bob keeps the mechanical layout simple, but heat management in slow traffic needs more attention than on a liquid-cooled bike - plan routes and gear accordingly in warmer conditions.

Fuelling & injector care

Fuelling on the Dyna Fat Bob comes from Electronic Sequential Port Fuel Injection (ESPFI). Cold starts and throttle response stay consistent across altitude and temperature, the main practical edge over a carbureted equivalent.

Brake disc and pad wear

Single 300mm disc, 4 piston fixed caliper up front provides the primary stopping power; inspect disc thickness and pad wear at each tyre change to catch scoring before it becomes a rotor replacement.

Suspension condition on used examples

Suspension duties are handled by 49 mm with polished aluminum fork triple clamp and dual-rate springs, up front and Coil over shock at the rear. Weeping fork seals aren't a dealbreaker on a used bike, but they're a fair basis for negotiating price.

Final drive maintenance

Belt final drive keeps day-to-day maintenance minimal on the Dyna Fat Bob - just periodic tension and wear checks rather than the regular cleaning a chain demands.

Frame & chassis check

The Mild steel, tubular frame; rectangular section backbone; stamped, cast and forged junctions, forged fender supports; MIG welded chassis holds up well with normal use; on a used bike it's still worth checking the head-stock and swingarm pivot area for impact damage or corrosion.

Handling the weight at a standstill

The Dyna Fat Bob's 321 kg kerb weight is worth factoring into how you handle it at a standstill - parking-lot manoeuvres need a bit more deliberate technique than on a lighter machine.

Dyna Fat Bob - Buying & Maintenance Guide

What to check before buying

A pre-purchase check on the 2017 Harley-Davidson Dyna Fat Bob should cover the same ground every time: service history, chain and sprocket condition, and any oil seepage around the casings. Start it from cold if you can - a well-kept Dyna Fat Bob settles to a smooth idle within seconds.

Oil and filter changes

Oil changes are the cheapest insurance you can buy for a Dyna Fat Bob's engine - keep to the manufacturer's interval rather than stretching it. Use the viscosity grade the manual specifies, not whatever's on sale.

Fuel system care

Injector systems like the Dyna Fat Bob's hold up well with basic care - decent fuel, an occasional cleaner additive, and draining old fuel before any layup longer than three months.

2017 Harley-Davidson Dyna Fat Bob - Frequently Asked Questions

What engine does the 2017 Harley-Davidson Dyna Fat Bob have?

The 2017 Harley-Davidson Dyna Fat Bob uses a Four stroke, V-Twin, Twin Cam 103° with integrated oil cooler engine with 1690 cc of displacement. It is air cooled.

How much does the 2017 Harley-Davidson Dyna Fat Bob weigh?

The 2017 Harley-Davidson Dyna Fat Bob weighs 321 kg. This is the manufacturer's wet figure.

How much power does the 2017 Harley-Davidson Dyna Fat Bob make?

The 2017 Harley-Davidson Dyna Fat Bob produces 132 Nm @ 3250 rpm of torque.

What is the fuel tank capacity of the 2017 Harley-Davidson Dyna Fat Bob?

The 2017 Harley-Davidson Dyna Fat Bob has a 18 9 litres fuel tank. At around 5-6 litres per 100 km, that is roughly 300-360 km between stops.

Is the 2017 Harley-Davidson Dyna Fat Bob suitable for shorter riders?

The 2017 Harley-Davidson Dyna Fat Bob has a seat height of Unladen 690 mm. This is a comfortable, accessible height for most riders.

What brakes does the 2017 Harley-Davidson Dyna Fat Bob have?

The 2017 Harley-Davidson Dyna Fat Bob uses Single 300mm disc, 4 piston fixed caliper at the front and Single 292mm disc, 2 piston torque-free floating caliper at the rear.

What tyre sizes does the 2017 Harley-Davidson Dyna Fat Bob use?

The 2017 Harley-Davidson Dyna Fat Bob runs 130/90B16 67 front and 180/70B16 77H rear tyres. A good selection of sport, touring and all-weather rubber is available in these sizes.

What gearbox does the 2017 Harley-Davidson Dyna Fat Bob have?

The 2017 Harley-Davidson Dyna Fat Bob is fitted with a 6 Speed transmission.

Harley-Davidson Dyna Fat Bob Spec Evolution

The Harley-Davidson Dyna Fat Bob was produced across 2 model years (2015-2017). The table below highlights the key specifications that changed across the production run - useful whether you are comparing years or tracking down a specific variant.

Specification	2015	2017
Wet Weight	320 kg / 706 lbs	321 kg / 708 lbs
Seat Height	Laden 663 mm / 26.1 in Unladen 686 mm / 27.0 in	Unladen 690 mm / 27.2 in
Fuel Capacity	18.9 Litres / 5.0 US gal	18 9 Litres / 5.0 US gal
Brakes - Front	Single 300mm disc 4 piston caliper	Single 300mm disc, 4 piston fixed caliper
Wheelbase	1618 mm / 63.7 in.	1620 mm / 63.8 in.
Brakes - Rear	Single 292mm disc 2 piston caliper	Single 292mm disc, 2 piston torque-free floating caliper
Bore x Stroke	98.4 x 111.3 mm	98.4 x 111.1 mm
Oil Capacity	2.8 Litres / 3.0 qts	2.8 Litres / 3.0 US qt

Key Specifications

Engine

Four stroke, V-Twin, Twin Cam 103° with integrated oil cooler

Power

Not published by manufacturer

Torque

132 Nm / 13.5 kgf-m / 98.0 ft/ lbs @ 3250 rpm

Top Speed

Not published by manufacturer

Weight

321 kg / 708 lbs

Fuel Capacity

18 9 Litres / 5.0 US gal

Full 2017 Harley-Davidson Dyna Fat Bob Specifications

Year 2016 - 17

Make Model Harley Davidson Dyna Fat Bob

Seat Height Unladen 690 mm / 27.2 in

Wheelbase 1620 mm / 63.8 in.

Ground Clearance 125 mm / 4.9 in

Length 2400 mm / 94.5 in

Dry Weight 306 kg / 675 lbs

Fuel Capacity 18 9 Litres / 5.0 US gal

Maximum Load / GVWR 492 kg / 1085 lbs

Oil Capacity 2.8 Litres / 3.0 US qt

Wet Weight 321 kg / 708 lbs

Max Torque 132 Nm / 13.5 kgf-m / 98.0 ft/ lbs @ 3250 rpm

Displacement 1690 cc / 103 cu. in

Engine Detail Four stroke, V-Twin, Twin Cam 103° with integrated oil cooler

Bore x Stroke 98.4 x 111.1 mm

Compression Ratio 9.6:1

Cooling System Air cooled

Exhaust Chrome, "Tommy Gun" 2-1-2 collector exhaust with dual mufflers

Fuel Consumption 5.6 L/100 km / 17.9 km/l / 42 US mpg

Fuel Induction Electronic Sequential Port Fuel Injection (ESPFI)

Ignition Single-fire, non-wasted, map-controlled spark ignition

Starter Electric

Clutch Multi-plate, wet

Final Drive Belt

Gear Ratios 1st 9.311 / 2nd 6.454 / 3rd 4.793 / 4th 3.882 / 5th 3.307 / 6th 2.790:1

Primary Drive Chain, 34/46

Transmission / Drive 6 Speed

Frame Type Mild steel, tubular frame; rectangular section backbone; stamped, cast and forged junctions, forged fender supports; MIG welded

Suspension - Front 49 mm with polished aluminum fork triple clamp and dual-rate springs,

Suspension - Rear Coil over shock

Lean Angle 31°

Rake 29°

Trail 125 mm / 4.9 in

Wheel Travel - Front 127 mm / 4.9 in

Wheel Travel - Rear 54 mm / 2.1 in

Brakes - Front Single 300mm disc, 4 piston fixed caliper

Brakes - Rear Single 292mm disc, 2 piston torque-free floating caliper

Tyres - Front 130/90B16 67

Tyres - Rear 180/70B16 77H

Wheels Gloss black cast aluminum wheel with laser etched graphics

Specifications are compiled from manufacturer documentation and cross-referenced technical sources, and corrected on an ongoing basis. Spot an error? Let us know.