Ever wonder how many models Harley-Davidson has made over its 125-year history?

1914 HARLEY DAVIDSON WILLIAM HARLEY ARTHUR DAVIDSON PHOTO FOUNDER

Founded in 1903, Harley-Davidson stands as America's oldest and most beloved motorcycle brand. Over its incredible 125-year journey, Harley has crafted countless iconic bikes and continuously evolved to meet changing tastes and markets, all while preserving its unique Harleyness. The company has weathered multiple wars and depressions, two world wars, fierce competition from both the British and the Japanese, and outlasted all its original competitors except Indian. In doing so, Harley has not only shaped motorcycle culture but also given birth to a significant piece of Americana.

This list showcases the most significant motorcycles in Harley-Davidson history—those legendary bikes that marked the next step in motorcycle evolution or set the standard for an entire bike segment.

The first ever H-D Factory was a 10x15 ft wooden shed that Harley and Davidson built in 1903

Let's dive in! For this list, we've divided the bikes into two broad eras – pre-Knucklehead and post-Knucklehead – which I've dubbed "The Beginning" and "The Modern Era." As you may know, the legendary Knucklehead was Harley's first overhead-valve engine. Its introduction propelled Harley into the modern era, and every modern big twin – Dynas, Softails, and touring models – can trace its lineage straight back to the old Knuck.

The Beginning

Walter Davidson poses more than a century ago with the Harley-Davidson single on which he earned a perfect score at the Federation of American Motorcyclists Endurance and Reliability Contest.

Years: 1903-1929

Engine Offerings: 405cc, 439cc, 495cc, 800cc, 1,000cc, 565cc, 810cc Known Suffixes: 1905, Model 1; 1908, Model 4; 1909, Model 5, Model 5A, Model 5C, Model 5D; 1910, Model 6, Model 6A, Model 6B, Model 6C, Model 6D; 1911, Model 7, Model 7A, Model 7B, Model 7C, Model 7D; 1912, Model 8, Model X8, Model 8A, Model X8A, Model 8D, Model X8D, Model X8E; 1913, Model 9A, Model 9B; 1914, Model 10A, Model 10B, Model 10C; 1915, Model 11B, Model 11C; 1916, Model 16B, Model 16C; 1917, Model 17B, Model 17C; 1918, Model 18B, Model 18C, Model 18E, Model 18F, Model 18J; 1919, Model 19F, Model 19J; 1920, Model 20F, Model 20J; 1921, Model 21F, Model 21FD, Model 21J, Model 21JD; 1922, Model 22F, Model 22FD, Model 22J, Model 22JD; 1923, Model 23F, Model 23FD, Model 23J, Model 23JD; 1924, Model 24FE, Model 24FD, Model 24FDCA, Model FDCB, Model FDCB, Model 24JE, Model 24JD, Model 24JDCA, Model 24JDCB, Model 24JDCB; 1925, Model 25FE, Model 25FDCB, Model 25JE, Model 25JDCB; 1926/1927, Model 26F, Model 26FD, Model 26J, Model 26JD, Model A, Model AA, Model B, Model BA; 1927, Model 27F, Model 27D, Model 27J, Model 27JD; 1928, Model 28A, Model 28AA, Model 28B, Model 28BA, Model 28F, Model 28FD, Model 28J, Model 28JD, Model 28JXL, Model 28JDXL, Model 28JH, Model 28JDH; 1929, Model 29A, Model 29AA, Model 29B, Model 29BA, Model 29D, Model 29F, Model 29FD, Model 29J, Model 29JD, Model 29JXL, Model 29JDXL, Model 29JH, Model 29JDH

This era was a time of incredible innovation and growth for Harley-Davidson, setting the stage for the legendary motorcycles that would follow

Reasons to Love: In the beginning, Harley-Davidson built motorcycles to race. The early years featured a dazzling variety of models, from singles, V-twins, and opposed twins in a range of frames. Engineering development was in full swing, and the American-made racing scene was a beautiful drama. During these years, Harley-Davidson was in a frenzy of innovation and development. New models, engines, and chassis configurations seemed to change every year as new breakthroughs were made and new ideas were tested.

Pre-Knucklehead: In 1901, William S. Harley completed a blueprint drawing of an engine in a bicycle frame. He partnered with longtime friend Arthur Davidson and, after two years of woodshedding in mutual friend Henry Melk's garage, rolled out their first bike in 1903 and immediately went racing. With the paint still wet on the 1903 bike, Mssrs. Harley and Davidson got to work on a new, more modern motorcycle with a bigger and better single-cylinder engine.

Completed in September of 1904, this bike rolled out of Melk's garage and went straight to the track, just like its 1903 predecessor. The engine was a 24.74 cubic inch, inlet-over-exhaust single with a single-speed transmission and a leather belt drive with back-up pedal assist. Weighing in at less than 200 pounds and boasting a top speed of around 40 miles-per-hour, it took fourth place with rider Ed Hildebrand in the saddle—not bad at all for what was essentially a one-off prototype!

In 1905, Harley-Davidson released the first true Harley—the Model 1. Essentially a production model of the 1904 prototype/racer, the Model 1 was nearly identical to its predecessors.

It wasn’t until 1909 that Harley-Davidson released its first V-twin powered motorcycle—the 49.5 cubic inch Model 5-D. Around this time, Harley-Davidson became America's largest motorcycle manufacturer, eclipsing arch-rival Indian and completely dominating smaller outfits like Thor, Henderson, Excelsior, and Pierce. The F-Head engine in the 5-D was a flop for a number of reasons which are, once again, outside the scope of this article, and was replaced a year later with a better engine.

1919 - The "F-head" engine becomes a workhorse of the Harley-Davidson motorcycle until 1929

In 1919, the 37ci Sport model roared onto the scene with its opposed-twin engine. By 1922, the powerful 74ci V-twin engine made its debut on the JD and FD models. Fast forward to 1926, Harley-Davidson reintroduced a single-cylinder engine for the first time since 1918, with Models A, AA, B, and BA available in both side-valve and overhead-valve configurations. And in 1928, the first Harley-Davidson two-cam engine was unleashed to the public on the JD series motorcycles.

Sport Model

Years: 1919-1923

Engine Offerings: 580cc/37ci

Known Suffixes: Model 19W

Reasons to Love: The Model 19W introduced groundbreaking technology into the lineup and eventually evolved into the legendary Army motorcycle, the W-Series.

Model W: Also known as the Sport Twin, the Model 19W was designed as a middleweight-sized bike and an entry-level model aimed at enticing new riders and expanding the motorcycling market of the day. The Sport featured Harley's first flat-twin engine and a trailing-link front fork suspension.

Harley-Davidson WJ Sport (1921)

The Sport Twin set speed records on runs across the country. However, like many models of the time, poor American sales led to the end of production after only four years. It's important not to confuse this model with the later W-Series, which featured the now-famous 45ci flathead engine.

D-Series - “45” Solo

Years: 1929-1932

Engine Offerings: 45ci

Known Suffixes: DL, D, Model 29D, Model 29FD, Model 30D, Model 30DL, Model 30DLD, Model 31D, Model 31DL, Model 31DLD, Model 32D, Model 32DL, Model 32DLD, Model 32D, Model 32DLD, Model 32DL, Model 33D, Model 33DL, Model 33DLD

Reasons to Love: Built as the entry-level, lightweight model to compete with the Indian Scout.

The year after Harley introduced the two-cam engine, they built the D-Series to take on the Indian Scout. This motorcycle introduced the side valve 45ci V-twin, known as the “45” and later nicknamed the flathead. First seen in the WR racing bike, it proved to be solid and reliable, leading Harley to settle into consistent production and models. Flathead V-twins were also available in 61ci and 74ci displacements throughout the same model years. The 45ci bikes looked very similar to their larger displacement siblings, but the easiest way to tell them apart is that the “45” has the final drive chain on the right instead of the left, like a modern Sportster.

R-Series “45” Solo

The first Harley-Davidson two cam engine is made available to the public on the R series motorcycles. The bike is capable of top speeds between 85 - 100 mph

Years: 1932-1936

Engine Offerings: 45ci

Known  Suffixes: R, RL, RLD; Model 34RL, Model 34R, Model 34RLD, Model 35RL, Model 35R, Model 35RS, Model 35RLD, Model 36R, Model 36RLDE, Model 36RS, Model 36R

Reasons to Love: New styling that made Harley a staple of Americana. Perseverance through the Great Depression.

A replacement for the D-Series, the R series was a crucial step in the evolution from the D to the W. While no major technical changes were introduced for the R, it was a significant motorcycle for Harley as it helped the company survive the Great Depression. Styling changes, like Art Deco style badging and paint, boosted sales and cemented Harley's place in American culture.W-Series

Harley Davidson 1929 Model D 750cc 2 cyl sv 2709

Years: 1929-1973 (according to Harley, variations of the engine were sold until 1973, primarily in the Servi-Car trike).

Engine Offerings: 45ci

Known Suffixes:  Model W “45” solo, Model WL sport solo, Model WLD “45” solo, WR, Model 37WL, Model 37WLD, Modwl 37WLDR, Model 37W, Model 37WS, Model 38WLD, Model 38WL, Model 38WLDR.

Reasons to Love: After the war, thousands of WLAs were sold off in surplus, sparking the chopper movement since they were plentiful and cheap.

This was the final model to receive the 45 (excluding the H-D Servi-Car, which we're not discussing here). A high compression option was available at the time. During war production, the WLA was built for military use and was essentially the only version produced. Nearly 60,000 units were manufactured for U.S. military use and for export through the Lend-Lease program during the war.

The UL

Years: 1937-1941

Engine Offerings: 74ci, 80ci

Model Suffix: U, UL, ULH, UH, UHS, US,

Reasons to Love: While these side valve/flathead engines were still being used in the UL for a while after the introduction of the Knucklehead, they brought with them some updated technology like a recirculating oiling system.

In 1937, Harley introduced the UL model, available in 74ci and 80ci V-twins. The previous models featured total-loss oiling systems, ran hot, and were mostly miserable and unreliable. The 45ci introduced a smoother running engine and more reliability, but it wasn’t until the big-twins of the UL, which used a dry sump lubrication system, that real reliability and cooler operating temps became common.

The new UL also boasted a four-speed transmission and forged aluminum heads with deeper cooling fins. Brass spark plug inserts were added to tackle the previous engines' issues of stripping threads. Customers could also opt for optional silicon aluminum heads. These big twins were a hit, but when the war broke out, production shifted from civilian models to focus on WLA models for the military efforts

The Modern Era - Knuckles, Pans, Shovels, and Sportsters

The EL

Years: 1936-1952

Model Suffix: E, EL

Engine: 61ci, 74ci

Reasons to Love: The EL-series is not only stunning, but it also marked the birth of Harley's modern era with the introduction of the Knucklehead, the company’s first overhead-valve V-twin.

The introduction of the first overhead-valve (OHV) V-twin from Harley-Davidson brought the company into the modern era of motorcycle design and engineering. While the first EL was impressive, Harley constantly refined it over the years to enhance power and performance. According to some historians, almost every part on the EL-series was changed between its first year and its last.

In 1941, the EL got even bigger with the introduction of a 74ci version of the Knucklehead, along with more engineering improvements across the line. Like other models, the outbreak of WWII meant new civilian EL models became very scarce.

K-Model Sportster

Years Built: 1952-1956

Engine Offerings: 45ci, 750cc, 888cc

Known Suffixes: K, KK, KR, KH, KGK, KRTT, KHRTT,

Reasons to Love: Just like the very first Harley-Davidson, the first K-Model was built with the essence of a race bike. And let's not forget, Elvis himself was a fan!

In an effort to stay competitive against the Brits, Harley-Davidson needed something lighter and sportier than their heavy 45ci flatheads and even heavier EL-models. Starting with the bottom end of a 45ci flathead engine, Harley engineers designed a case to house the transmission for a lighter and more condensed package. This was similar to the unit construction power plants of the Triumphs and BSAs that were all the rage with the kids. (Remember, Marlon Brando's Johnny rode a Triumph in The Wild One -Ed.) The company added aluminum heads with fins for cooling to their new engine, then built a lightweight, narrow chassis around it all. The engine performed well, and the bike was lightweight, narrow, and easy to ride. It was also the first Harley-Davidson to feature suspension on both wheels – hydraulic forks on the front and exposed shocks on a swingarm in the rear.

With all this engineering, Harley-Davidson birthed not just a sporty street cruiser but its next race bike as well. The K-model became the platform for flat tracker and road racers of the era, and evolved into the XR bikes of later years.

Sportster XL

Years Built: 1957-current

Engine Offerings: 750cc, 883cc, 1000cc, 1200cc

Known Suffixes: XL, XL883, XL883C, XL 883L, XL883R, XL1100, XL1200, XL1200C, XL1200R, XL1200S, XLCH, XLCR, XLH, XLH883, XLH883R, XLH1200, XLH1200S. XLS, XLX, XR1000, XLRTT,

Reasons to Love: Economical, easy to maneuver (for a Harley), and the foundation for many factory-built race bikes like XR flat trackers, road racers, and the cool cafe model (XLCR).

Factory Experimental FX Superglide

Years Built: 1971-2017

Engine Offerings: 1200cc, 80ci, 1310cc, 1,340cc, 1,450cc, 1,584cc, 1,690cc,

Known Suffixes: FX, FXE, FXD, FXD35, FXS, FXDL, FXEF, FXDF, FXWG, FXDWG, FXDWGI, FXB, FXDC, FXDG, FXDS-CON, FXDX, FXDXT, FXLR, FXS, FXSB, FXR, FXRT, FXRP

Reasons to Love: Marketed as Harley's first factory custom to capture the growing Chopper movement. A solid mid-range line with the power of a big twin and the handling of a Sportster. (Also, a super sweet boattail rear end and swingin' red, white, and blue paint job -Ed.)

Designed by Willie G. Davidson, the idea behind the FX-series seems so simple in retrospect: take the light handling front end from a Sportster and mount it on a full-size touring bike frame. Enter the Superglide. FX was short for Factory Experimental, as the bike was a response to the wild late-60s custom scene. Introduced only a few years after Billy and Captain America stormed onto the big screen in Easy Rider, the FX Superglide was a huge and instant success.

If the Sportster is a Miata in terms of agile performance in the H-D realm, then the Superglide was a Corvette. This simple act of stripping down a touring bike introduced a new category of motorcycle and likely attracted as many new riders as the Sportster. The FX platform evolved constantly over three decades until it was axed in 2018, and was arguably one of the most consistently updated models in the Harley-Davidson lineup. The Superglide finally brought Harley into the good graces of new motorcycle reviewers and provided real competition against the Japanese brands.

The Superglide name came and went over the years, but the FX prefix for the line remained. The FX Superglide was eventually replaced by the FXR, the one-percenter club member’s bike of choice. The Superglide remained alongside the FXR for a few years, gaining a small, single tank and dropping the two-piece tank and dash combo.

The Superglide was eventually discontinued with the introduction of the Evolution engine in 1984. The Dyna platform then replaced the FXR in 1991, and while all three motorcycles have very different engineering and design features, they all share the FX prefix and DNA.

FX/FL Softail

Years: 1984 to current.

Engines: 1200cc, 80ci, 1310cc, 1,340cc, 1,450cc, 1,584cc, 1,690cc,

Known Suffixes: FXCW, FXCWC, FXST, FXSTB, FXSTBI, FXSTC, FXSTD, FXSTS, FXWG, FLST, FLSTC, FLSTF, FLSTFI, FLSTN, FLSTS, FLSTSB, FLSTSC

Reasons to Love: Comfortable, classically styled, and offered in a huge variety of styles. Hardtail looks with modern performance.

The Softail platform was a revelation in 1984, combining the looks of a hardtail with the ride and comfort of a modern motorcycle. Built to resemble Harleys from the 40s and 50s, the Softails' rear suspension featured hidden shocks underneath the bike, mounted to a triangular-shaped swingarm, and fat hydraulic forks up front. Softail engines were hard-mounted to the frame—unlike the FX/Dyna series where the engine was isolated from the frame by rubber vibration dampers—giving the bikes a reputation for being slow and rattly.

Despite this rough-riding reputation, Softails steadily grew into one of the most popular and diverse lines in Harley's history. They occupied a middle ground in the big twin family between the performance-minded FX/Dyna line and the comfortable road-going couches of the FL touring line. Throughout the Softail's original 32-year run, the line produced some of Harley's most iconic modern bikes, such as the Fat Boy, the Heritage Softail Classic, and the Deuce.

FL Touring

2018 Harley-Davidson Road Glide.

Years: 1941-present

Engines: 1200cc, 80ci, 1310cc, 1,340cc, 1,450cc, 1,584cc, 1,690cc, 61ci, 74ci,

Known Suffixes: FL, FLH, FLHX, FLHRS, FLHPI, FLHR, FLHRCI, FLHS, FLHT, FLHTC, FLHTK, FLHTCSE, FLHTPI, FLHTCUI, FLHTCUSE, FLHXXX, FLT, FLTC, FLTCU, FLHTCUTG, FLTR, FLTRI, FLTRX, FLTRSEI

Reasons to Love: The Harley-Davidson FL Touring models have been comfortable touring cruisers and the most quintessential Harley of the modern era.

Harley-Davidson has used the FL name since 1941. FLs were much the same as their EL, U, and UL siblings, and were powered by the Knucklehead OHV V-twin. The FL series remained largely unchanged until 1948 when the Panhead engine was released. In 1949, just a year after getting the Panhead upgrade, the FL series' old-timey leading link springer front end was replaced by a set of modern hydraulic forks, thus giving birth to the famous Hydra Glide.

In 1958, the FL Hydra Glide underwent a radical redesign, introducing a rear suspension consisting of a swingarm and twin shocks. The name was changed from Hydra Glide to Duo Glide (Duo, two, two suspensions...get it?) and a legend was born. A few years later, in 1965, the Duo Glide was replaced with the Electra Glide, which featured the first electric starter on a Harley-Davidson big twin bike. Harley's iconic batwing fairing was introduced as an option for the Electra Glide in 1969 and was initially easily removable, unlike today's permanently affixed fairings. FLs got a front disc brake in 1972, and over the next few decades, they went through numerous transmission, engine, and electrical system upgrades.

Today, the FL lineup consists of Harley's big-time baggers and touring models. From the stylish Road King bagger to the unique Road to the high-end, eye-wateringly expensive Ultra Limited, Harley's touring bikes carry on the proud tradition of powerful and comfortable FL tourers.

VRSC - V-ROD

Years: 2002-2017

Engine Offerings: 69ci water-cooled Revolution v-twin, 76ci water-cooled Revolution v-twin.

Known Suffixes: VRSC1 VRSCA, VRSCAW, VRSCB, VRSCD, VRSCDX, VRSCF, VRSCSE, VRSCSE2, VRSCR, VRSCX, VRXSE

Reasons to Love: Harley made a great attempt at producing a modern, well-engineered V-twin. The V-Rod is reminiscent of the beginning days when Harley prioritized racing. Also, Porsche DNA.

Ah, the V-Rod. Developed in the late-90s/early-aughts to compete against ever faster muscle bikes like Yamaha's savage V-Max, the V-Rod was always an oddity in the Harley-Davidson family. Developed around the newly built, Porsche-designed Revolution engine, the V-Rod was initially a major success and received high marks from the motorcycling press. The Revolution was a 60-degree, water-cooled V-twin that performed unlike anything Harley had ever produced. The design included a hydro-formed frame and underseat fuel tank for a low center of gravity. It performed well, but it was sadly discontinued (along with its Dyna cousins) with the introduction of Harley's new 2018 models. 

XG Street

Years: 2014-present

Engine Offerings: 500cc, 750cc

Known Suffixes: XG, XG750R, XG750G, XG750

Reasons to Love: The XG is Harley-Davidson’s modern attempt at capturing the youth market with a sporty, small displacement bike. The XG harkens back to the K-model in that it's an inexpensive, nimble, and fun motorcycle that exists largely outside of Harley's established lines. Like the K-model, it’s also the base for the company’s modern flat track race bike.

Harley's new flat tracker, the XG750R

When it was released, the XG was Harley-Davidson’s first all new model in 13 years, the first sub-1000cc production engine in decades, and the least expensive offering in the lineup. Originally the Street was built for the Indian and European markets, where the 500cc or 750cc motorcycle sales have been booming for over a decade. Eventually, the 500cc model was brought to The States and was first introduced as the go-to bike for Harley's in-house riding school. Once established in the Learn to Ride program, the XG was then made available to moto journalists and the public. Soon thereafter, the 750 model appeared in American showrooms and the rest is history.