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Harley-Davidson · Power cruiser · M-8 117 Custom

2026 Harley-Davidson Breakout: specs, gearing and calculators

Long, low and raked out: a 21-inch front, a 240 mm rear tyre, 34 degrees of rake and the Milwaukee-Eight 117 Custom. Every figure below links to its source, and every calculator opens with the Breakout’s own numbers.

2026 Harley-Davidson Breakout in orange, studio side view
2026 Harley-Davidson Breakout in orange, studio side view. Photo: Harley-Davidson

Know your version. The Breakout returned for 2023 with the Milwaukee-Eight 117. Earlier Breakouts (Twin Cam engines from 2013, then the Milwaukee-Eight 107 or 114 from 2018) have different engines and figures. EU spec sheets list 168 Nm of torque; the US figure of 126 lb-ft (171 Nm) uses a different test method.


Engine
Milwaukee-Eight 117 Custom, 1,923 cc [src]
Power / torque
103 hp / 126 lb-ft (claimed, US) [src]
Weight
681 lb (309 kg) running order [src]
Seat height
25.6 in (650 mm) laden [src]
Rake / trail
34° / 5.7 in [src]
US price
$22,999 [src]

MotoWild Lab

Calculators with the Breakout’s numbers filled in

All calculators →

Each one opens with the published figures for the 2026 Breakout: the Milwaukee-Eight 117’s bore and stroke, the gear ratios, belt pulleys, tyre sizes, rake and weight. Change any number to match your bike, see the formula worked through, and switch between imperial and metric.

EngineEngine displacement calculatorBore, stroke and number of cylinders to cc and cubic inches.Filled in: Bore, stroke, cylindersEnginePower from torque and rpmConvert torque at an rpm into kW and horsepower.Filled in: Claimed peak torque and its rpmEngineBMEP calculator (brake mean effective pressure)How much torque an engine makes for its size, as an average cylinder pressure.Filled in: Peak torque and displacementEngineMean piston speed calculatorAverage piston speed from stroke and rpm, the classic measure of how hard an engine is revving.Filled in: Stroke, rpm at peak powerEngineBig bore and stroker kit calculatorNew displacement and compression ratio after a bigger bore, a longer stroke or both.Filled in: Stock engine; new bore set to 4.25 in as an exampleEngineDynamic compression ratio calculatorEffective compression once the intake valve closes, from static ratio, rod length and cam timing.Filled in: Bore, stroke, compression; add your rod length and cam cardGearing and chainSpeed in every gear calculator (gear chart)Road speed in all six gears at one rpm, from primary, gearbox and final drive ratios.Filled in: All six gears, primary, belt and rear tyreGearing and chainCruising rpm calculatorEngine rpm at a given road speed in any gear.Filled in: 70 mph in 6th, stock gearing and tyreGearing and chainBelt drive pulley change calculatorHow far the rear axle moves, and how the gearing changes, when you fit different belt pulleys.Filled in: Stock pulleys; enter your belt's tooth countTyres and wheelsTyre size calculatorSidewall height, overall diameter and circumference from a size such as 120/70-17.Filled in: Stock rear tyre 240/40-18Tyres and wheelsSpeedometer error after a tyre size changeHow far off the speedometer reads with a different tyre size.Filled in: Stock rear tyre; enter the new sizeChassis and suspensionRake and trail calculatorGround trail from steering head angle, fork offset and front wheel size.Filled in: Published rake; offset worked back from the published trailPerformance and airPower-to-weight ratio calculatorkW per tonne, hp per tonne and kg per hp, with or without the rider.Filled in: Claimed power, running-order weightPerformance and airAltitude and temperature power loss calculatorAir density at altitude and how much power a naturally aspirated engine loses.Filled in: Claimed power at Denver's 5,280 ftPerformance and airFuel range calculatorHow far a tank goes, and how far until the reserve, at your fuel consumption.Filled in: Tank and reserve; enter your consumption

2026 Breakout specifications

Figures as published, with the sources underneath. Power and torque are Harley-Davidson’s US ratings; seat height is laden (with a rider aboard) unless stated.

Spec2026 Harley-Davidson Breakout
EngineMilwaukee-Eight 117 Custom, 1,923 cc (117 cu in) 45° V-twin
Power (claimed)103 hp (77 kW) at 4,800 rpm
Torque (claimed)126 lb-ft (171 N·m) at 3,000 rpm
Bore × stroke103.5 × 114.3 mm (4.075 × 4.5 in)
Compression ratio10.3:1
Weight681 lb (309 kg) in running order
Seat height25.6 in (650 mm) laden; 26.2 in (665 mm) unladen
Fuel tank5 US gal (18.9 L), including about 1 gal (3.8 L) reserve
Rake / trail34° / 5.7 in (145 mm)
Wheelbase66.7 in (1694 mm)
WheelsCast 21 / 18 in
Transmission6-speed; primary chain 34/46, final belt 32/66
Gear ratios (overall)9.311 / 6.454 / 4.793 / 3.882 / 3.307 / 2.79
US price$22,999 (starting MSRP)
Ground clearance4.5 in (114 mm)

Sources: motorcycle.com · totalmotorcycle.com · aeharley.com · bartelsharley.com · harley-davidson.com · riders-share.com. Where sources disagree we show the range.

Gearing

Breakout gear ratios and road speed in every gear

Six speeds, a 34/46 primary chain and a 32/66 final belt. The table works the published overall ratios back to the gearbox ratios and gives road speed at three engine speeds.

GearGearbox ratioOverall ratioAt 2,000 rpmAt 3,000 rpmAt 4,000 rpm
13.3379.31116 mph 26 km/h25 mph 39 km/h33 mph 53 km/h
22.3136.45424 mph 38 km/h35 mph 57 km/h47 mph 76 km/h
31.7184.79332 mph 51 km/h48 mph 77 km/h63 mph 102 km/h
41.3913.88239 mph 63 km/h59 mph 95 km/h78 mph 126 km/h
51.1853.30746 mph 74 km/h69 mph 111 km/h92 mph 148 km/h
61.0002.79055 mph 88 km/h82 mph 132 km/h109 mph 175 km/h

In 6th: 60 mph: 2,200 rpm · 70 mph: 2,570 rpm · 80 mph: 2,940 rpm

Gearbox ratios are the published overall ratios divided by the primary (46/34) and belt (66/32) ratios. Speeds use the rear tyre's unloaded circumference (2,040 mm); under load it rolls a few percent shorter, so real rpm is slightly higher. Published overall ratios: aeharley.com.

Make your own gear chart or see what a pulley change does →

Tyres and wheels

Stock tyre sizes

Confirm against the sidewalls on your bike and the owner’s manual, including the load index, speed rating and whether the tyre is bias (B) or radial (R).

Version and yearsFrontRearRimsSource
Harley-Davidson Breakout
2026		130/60B21240/40R18Cast 21 / 18 inmotorcycle.com

Side by side

Breakout vs Fat Boy

The same figures for both, on the same basis.

Head-to-head · MotoWild data

2026 Harley-Davidson Breakout in orange, studio side viewBREAKOUT2026 Harley-Davidson Breakout2026 Harley-Davidson Fat Boy parked on a brick-lined streetFAT BOY2026 Harley-Davidson Fat Boy
  • Ready to ride, the 2026 Harley-Davidson Breakout is the lightest here, roughly 6 kg (13 lb) less than the 2026 Harley-Davidson Fat Boy. Makers weigh differently, so treat small gaps as a draw.

Seat height (laden, as published)

2026 Harley-Davidson Breakout650 mm
2026 Harley-Davidson Fat Boy658 mm

A range means sources disagree. Lower is easier at a stop, but weight and seat width matter too.

Weight, ready to ride

2026 Harley-Davidson Breakout309 kg · running order, claimed
2026 Harley-Davidson Fat Boy315 kg · running order, claimed

Figures as published, with their basis. Wet, kerb and full-tank weights are close but not identical, so a few kilos either way is a draw.

Fuel tank

2026 Harley-Davidson Breakout18.9 L
2026 Harley-Davidson Fat Boy18.9 L
Spec2026 Harley-Davidson Breakout2026 Harley-Davidson Fat Boy
EngineMilwaukee-Eight 117 Custom, 1,923 cc (117 cu in) 45° V-twinMilwaukee-Eight 117 Custom, 1,923 cc (117 cu in) 45° V-twin
Power (claimed)103 hp (77 kW) at 4,800 rpm103 hp (77 kW) at 4,800 rpm
Torque (claimed)126 lb-ft (171 N·m) at 3,000 rpm126 lb-ft (171 N·m) at 3,000 rpm
Weight681 lb (309 kg) in running order694 lb (315 kg) in running order
Seat height25.6 in (650 mm) laden; 26.2 in (665 mm) unladen25.9 in (658 mm) laden; 675 mm unladen
Fuel tank5 US gal (18.9 L), including about 1 gal (3.8 L) reserve5 US gal (18.9 L), including about 1 gal (3.8 L) reserve
Rake / trail34° / 5.7 in (145 mm)30° / 4.1 in (104 mm)
Wheelbase66.7 in (1694 mm)65.0 in (1651 mm)
US price$22,999 (starting MSRP)$22,599 (starting MSRP)
Tyres130/60B21 / 240/40R18
Cast 21 / 18 in		160/60R18 / 240/40R18
Cast 18 / 18 in

Versions and model years

  • Harley-Davidson Breakout: The Breakout returned for 2023 with the Milwaukee-Eight 117. Earlier Breakouts (Twin Cam engines from 2013, then the Milwaukee-Eight 107 or 114 from 2018) have different engines and figures. EU spec sheets list 168 Nm of torque; the US figure of 126 lb-ft (171 Nm) uses a different test method.
  • Harley-Davidson Fat Boy: Fat Boys have used the Evolution, Twin Cam and Milwaukee-Eight engines since 1990. These figures are for the 2026 bike with the 117 Custom; check your model year before using them for parts or settings.

Figures: motorcycle.com · totalmotorcycle.com · aeharley.com · bartelsharley.com · harley-davidson.com · riders-share.com · motorcycle.com · totalmotorcycle.com · torquepedia.com · harleydavidsonofsaltlakecity.com · harley-davidson.com.

All eight 2026 cruisers in one table →

Model history

Which Breakout do you have?

Engines and frames have changed over the years, so older bikes have different figures.

  1. 2013

    First Breakout

    The Breakout joins the Softail family with a 21-inch front and wide rear tyre. [src]

  2. 2018

    New Softail chassis

    The Softail range moves to a new frame with the Milwaukee-Eight engine. [src]

  3. 2026

    Current model

    Milwaukee-Eight 117 Custom, 103 hp and 126 lb-ft claimed, 240/40R18 rear tyre. [src]

2026 Breakout in pictures

2026 Harley-Davidson Breakout in grey, studio side view
2026 Harley-Davidson Breakout in grey, studio side view. Photo: Harley-Davidson
2026 Harley-Davidson Breakout, front view
2026 Harley-Davidson Breakout, front view. Photo: Harley-Davidson

Harley-Davidson guides and comparisons

Milwaukee-Eight 117 Big Bore and Stroker Math: Displacement and CompressionHarley-Davidson · GuidesMilwaukee-Eight 117 Big Bore and Stroker Math: Displacement and CompressionWhat a bigger bore or longer stroke does to a 117: cubic inches, compression with the same clearance volume, and why kits…Updated Oct 27, 2026Harley-Davidson Belt Drive: Pulley Changes, Belt Length and Axle PositionHarley-Davidson · GuidesHarley-Davidson Belt Drive: Pulley Changes, Belt Length and Axle PositionHow a toothed final drive belt is sized, how far the axle moves when you change a pulley, and what to check…Updated Oct 27, 2026Harley-Davidson Softail Gear Ratios and Highway rpm (2026), Worked OutHarley-Davidson · GuidesHarley-Davidson Softail Gear Ratios and Highway rpm (2026), Worked OutOverall ratios to gearbox ratios, road speed in every gear, rpm at 60, 70 and 80 mph for each rear tyre, and…Updated Oct 27, 2026Harley-Davidson Fat Boy vs Breakout (2026): Same Engine, Different Front EndsHarley-Davidson · CompareHarley-Davidson Fat Boy vs Breakout (2026): Same Engine, Different Front EndsBoth have the 117 Custom and a 240 rear. Rake, trail, front wheel size and wheelbase are where they differ, and the…Updated Oct 26, 20262026 Harley-Davidson Cruisers Compared: All Eight Softails by the NumbersHarley-Davidson · Compare2026 Harley-Davidson Cruisers Compared: All Eight Softails by the NumbersWeight, power, seat, tank, geometry, rpm at 70 mph and price for every 2026 Softail cruiser, with power-to-weight and chassis families.Updated Oct 26, 2026Milwaukee-Eight 117 Classic vs Custom vs High Output: What ChangesHarley-Davidson · GuidesMilwaukee-Eight 117 Classic vs Custom vs High Output: What ChangesSame bore, stroke and compression, three claimed outputs. What differs, which 2026 models get which, and what BMEP and piston speed say.Updated Oct 26, 2026

Breakout FAQ

What is the rake and trail of the 2026 Breakout?

34 degrees of rake and 5.7 in (145 mm) of trail, on a 66.7 in (1,694 mm) wheelbase, the longest in the cruiser range.

What tyre sizes does the Breakout use?

130/60B21 front and 240/40R18 rear, Michelin Scorcher 11.

How much fuel does the Breakout hold?

5 US gal (18.9 L), including about 1 gal (3.8 L) of reserve, according to dealer spec sheets.