2015 Harley-Davidson Dyna Fat Bob Specifications

Name: 2015 Harley-Davidson Dyna Fat Bob
Brand: Harley-Davidson

Custom / cruiser • Specs last verified 13 July 2026

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2015 Harley-Davidson Dyna Fat Bob Overview

Harley-Davidson Dyna Fat Bob is a custom / cruiser motorcycle, displacing 1690 cc. Power comes from a Four stroke, V-Twin, Twin Cam 103° with integrated oil cooler engine, a compression ratio of 9.6:1. On the performance side, it delivers 134 Nm @ 3500 rpm of torque. On the road, the 2015 Dyna Fat Bob tips the scales at 320 kg, carries a 18.9-litre fuel tank, offers a seat height of Laden 663 mm and spans a 1618 mm wheelbase. That's roughly 19.4 kg heavier than the average custom / cruiser motorcycle in our database. The full 2015 Harley-Davidson Dyna Fat Bob spec sheet below covers every technical detail, from suspension travel to tyre sizes.

2015 Dyna Fat Bob - Pros & Cons

Strengths

Fuel injection: Fuel injection means consistent cold starts and clean throttle response without the fussiness of a carbureted setup.
Accessible seat height: A Laden 663 mm seat height keeps this manageable for most riders, which helps confidence at parking-lot speeds.
Large fuel range: A 18.9-litre tank means fewer stops on longer rides - a genuine plus for touring or a lengthy daily commute.
Low-maintenance final drive: Running Belt final drive cuts out the regular chain cleaning and tensioning that most bikes need.

Considerations

Age-related wear: Nothing specific stands out as a weak point on the Dyna Fat Bob - the usual used-bike checks (service history, consumables, tyres) apply.

Wear Points & Servicing Notes

Heat management in traffic

Because the Dyna Fat Bob relies on airflow rather than a coolant jacket, expect noticeably more radiant heat at low speed and in traffic. It's inherent to air cooling, and ventilated gear largely offsets it.

Fuelling & injector care

The Electronic Sequential Port Fuel Injection (ESPFI) on the Dyna Fat Bob needs little beyond good fuel and periodic use of an injector-cleaner additive - no jetting or float-bowl maintenance to worry about.

Brake disc and pad wear

Braking up front comes from Single 300mm disc 4 piston caliper - solid stopping power, with disc and pad wear best checked on the same schedule as tyre changes.

Suspension condition on used examples

The Dyna Fat Bob's suspension runs 49 mm with polished aluminum fork triple clamp and dual-rate springs, at the front. The rear uses Coil over shock. Fork-seal condition and rear linkage play are the two things worth checking before buying used.

Final drive maintenance

The Dyna Fat Bob runs belt final drive: no lubrication or frequent adjustment like a chain, though belt tension and wear are worth a periodic look.

Frame & chassis check

Built around a Mild steel, tubular frame; rectangular section backbone; stamped, cast and forged junctions, forged fender supports; MIG welded, the Dyna Fat Bob's chassis is straightforward to inspect: look for corrosion, cracks or repair welds around stress points like the head-stock and swingarm mounts.

Handling the weight at a standstill

320 kg puts the Dyna Fat Bob toward the heavier end of its class. It's most noticeable at walking pace; once underway the mass settles into the handling rather than fighting it.

Dyna Fat Bob - Buying & Maintenance Guide

What to check before buying

Before handing over money for a used 2015 Harley-Davidson Dyna Fat Bob, cover the fundamentals: service book and oil change history, chain and sprocket wear, and any sign of oil weeping around the casings. Cold-starting it yourself tells you a lot - a healthy Dyna Fat Bob should catch quickly and settle into a smooth idle.

Oil and filter changes

Nothing protects a Dyna Fat Bob's engine like disciplined oil changes - stay on the manufacturer's schedule (roughly every 6,000 km or annually). Match the viscosity grade to what the owner's manual specifies, not what's cheapest.

Fuel system care

Fuel injection on the Dyna Fat Bob needs little attention beyond decent fuel and an occasional system-cleaner additive. Anything left standing for three months or more should have its fuel drained and replaced before it varnishes the injectors.

2015 Harley-Davidson Dyna Fat Bob - Frequently Asked Questions

What engine does the 2015 Harley-Davidson Dyna Fat Bob have?

The 2015 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 2015 Harley-Davidson Dyna Fat Bob weigh?

The 2015 Harley-Davidson Dyna Fat Bob weighs 320 kg. This is the manufacturer's wet figure.

How much power does the 2015 Harley-Davidson Dyna Fat Bob make?

The 2015 Harley-Davidson Dyna Fat Bob produces 134 Nm @ 3500 rpm of torque.

What is the fuel tank capacity of the 2015 Harley-Davidson Dyna Fat Bob?

The 2015 Harley-Davidson Dyna Fat Bob has a 18.9-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 315-377 km between stops.

Is the 2015 Harley-Davidson Dyna Fat Bob suitable for shorter riders?

The 2015 Harley-Davidson Dyna Fat Bob has a seat height of Laden 663 mm. This is a comfortable, accessible height for most riders.

What brakes does the 2015 Harley-Davidson Dyna Fat Bob have?

The 2015 Harley-Davidson Dyna Fat Bob uses Single 300mm disc 4 piston caliper at the front and Single 292mm disc 2 piston caliper at the rear.

What tyre sizes does the 2015 Harley-Davidson Dyna Fat Bob use?

The 2015 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 2015 Harley-Davidson Dyna Fat Bob have?

The 2015 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

134 Nm / 98.8 ft/ lbs @ 3500 rpm

Top Speed

Not published by manufacturer

Weight

320 kg / 706 lbs

Fuel Capacity

18.9 Litres / 5.0 US gal

Full 2015 Harley-Davidson Dyna Fat Bob Specifications

Year 2014 - 15

Make Model Harley Davidson Dyna Fat Bob

Seat Height Laden 663 mm / 26.1 in Unladen 686 mm / 27.0 in

Wheelbase 1618 mm / 63.7 in.

Height 1130 mm / 44.5 in.

Length 2329 mm / 91.7 in

Width 889 mm / 35.0 in

Fuel Capacity 18.9 Litres / 5.0 US gal

Maximum Load / GVWR 492 kg / 1085 lbs

Oil Capacity 2.8 Litres / 3.0 qts

Wet Weight 320 kg / 706 lbs

Max Torque 134 Nm / 98.8 ft/ lbs @ 3500 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 111.3 mm

Compression Ratio 9.6:1

Cooling System Air cooled

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 2.79

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

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 caliper

Brakes - Rear Single 292mm disc 2 piston caliper

Tyres - Front 130/90B16 67

Tyres - Rear 180/70B16 77H

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