2021 Harley-Davidson Road King with Champion Avenger Sidecar
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When John reached out to UNB Customs, he had one clear goal — to turn his 2021 Harley-Davidson Road King into a classic-style sidecar rig built for two. The bike started as a single-seat, all-black cruiser, but John wanted something with more character, comfort, and room to share the ride.
The plan: transform it from a solo setup into a two-up touring Harley, paired with a Champion Avenger sidecar, and give it a timeless, two-tone look inspired by Harley’s golden era — complete with hand-painted pinstripes that accent every curve of the build.
From Solo to Shared Adventure
When the bike rolled into the shop, it was a clean, factory-finished Road King — simple, black, and understated. John envisioned something more expressive: a classic touring rig built for comfort, performance, and shared adventure.
We began by converting the Harley from a solo seat to a two-rider setup using a Saddlemen Roadsofa LS Seat in Whisper Brown with matching passenger pad and sissy bar. The new seat combines long-distance comfort with that rich, vintage aesthetic John was after.
We paired it with Harley-Davidson chrome docking hardware, passenger footboards, and a chrome luggage rack, giving the setup both practicality and polish.
Next came one of the most dramatic visual changes — the two-tone turquoise and cream paint, finished off with hand-painted dual-color pinstripes that flow across the bike and sidecar. Every stripe was done by hand, giving the build a one-of-a-kind, artisan touch that perfectly frames the panels.
The black wall tires were replaced with wide whitewall Shinko tires mounted on 10-spoke OEM wheels to complete that period-correct look.
The Champion Avenger
We matched the bike with a Champion Avenger sidecar, one of the most proven and stylish sidecars available for Harley touring models.
The Avenger’s independent suspension, built-in braking system, and contoured body make it a natural complement to the Road King.
John’s sidecar features a fender light, Harley-Davidson tail light, and a clear windshield for protection without sacrificing visibility.
For comfort and convenience, we added an Entry/Exit Step, Interior Light, Trunk Light, USB Power Port, Accessory Plug, Seat Belt, and even an Art Vent for airflow on warm rides.
We matched John’s Whisper Brown Saddlemen seat to his Tonneau cover that fits perfectly when the car is not in use.
This Avenger also includes TILT (Tracking Increment Lean-Out Technology), which allows fine adjustments for road camber and passenger weight — ensuring the sidecar tracks straight and smooth no matter the conditions.
For control, we installed an Easy Steer Triple Tree to lighten steering effort, plus Reverse Gear for easy maneuvering.
We also added performance grips, and a did full alignment after the sidecar installation to make sure the sidecar handled like a dream.
Lighting upgrades include a Spot Lamp with integrated turn signal, additional chrome accents, and alignment of the bike and car lighting systems for safety and symmetry.
Performance, Comfort & Personality
John wanted this build to be as enjoyable as it was beautiful — both for him and his favorite co-pilot. His dog rides shotgun in the sidecar, enjoying the wind and attention wherever they go.
Between the tilt technology, smooth suspension, and steering kit, this setup rides as comfortably as it looks.
The combination of turquoise and cream paint, dual hand-painted pinstripes, whitewall tires, and the brown Saddlemen interior create a visual harmony that feels both nostalgic and modern. It’s the kind of color palette that could have rolled off a Harley line in the 1950s — only sharper, cleaner, and built for today’s highways.
The Final Look
When John’s 2021 Road King with its matching Champion Avenger sidecar rolled out of our shop, it was nothing short of stunning. The turquoise and cream finish catches every ray of light, the stripes trace the lines like fine jewelry, and the whitewalls and chrome accents give it that unmistakable vintage touring vibe.
What began as a solo black Road King is now a two-up sidecar rig built for adventure, style, and stories — a build made to be enjoyed, not just admired.
We’re proud of this one — not just for its craftsmanship, but for the joy it brings to its owner (and his furry riding partner).
At UNB Customs, that’s what it’s all about — turning ideas into machines that make memories every mile.
