Key Features of the 2026 Harley-Davidson® Fat Boy®

Milwaukee-Eight® 117 Custom

The heart of the Fat Boy® is its Milwaukee-Eight® 117 Custom engine—117 cubic inches of V-Twin performance tuned for strong, usable thrust. It produces 126 ft-lbs of torque at 3000 rpm and 103 horsepower at 4800 rpm, delivering smooth roll-on power across the rev range. Electronic Sequential Port Fuel Injection (ESPFI) sharpens response while supporting consistent fueling in varying conditions. A 2-into-2 staggered exhaust, with a catalyst in the muffler, complements the engine’s character with a deep, satisfying note. Crisp acceleration for urban riding and steady cruising for longer stretches are both squarely in this powertrain’s wheelhouse, and gear ratios are spaced for flexible performance from first through sixth.

Machined Lakester Cast Aluminum Wheels

The Classic Machined Lakester wheels define the Fat Boy®’s steamroller stance and help establish its planted feel. Wrapped in wide Michelin® Scorcher 11 rubber—160/60R18 front and 240/40R18 rear—they contribute to a confident, stable ride. The broad contact patch at the rear enhances straight-line composure and accelerative grip, while the front tire’s profile supports smooth steering inputs. These wheels and tires are more than a style statement; they are engineered to complement the 65-inch wheelbase, 30-degree rake, and 4.1-inch trail for a balanced combination of stability and predictable handling.

Rider Safety Enhancements

Harley-Davidson’s Rider Safety Enhancements suite supports the rider in tricky situations by optimizing traction and braking. Anti-lock Brake System (ABS) and Traction Control System (TCS) are designed for straight-line stability under acceleration and braking, while Drag-Torque Slip Control System (DSCS) helps manage rear-wheel slip during abrupt deceleration or downshifts. Cornering variations—Cornering Enhanced ABS (C-ABS), Cornering Enhanced Traction Control System (C-TCS), and Cornering Drag-Torque Slip Control System (C-DSCS)—adjust intervention based on lean angle to help the tires maintain available grip mid-corner. Tire Pressure Monitoring System (TPMS) provides timely alerts to keep tire pressures in the ideal range for performance and tire life. Together, these systems add a layer of reassurance without diluting the Fat Boy®’s direct, mechanical feel.

Signature Headlamp Nacelle and LED Lighting All Around

The Fat Boy®’s Signature Headlamp Nacelle anchors its bold front profile while housing an all-LED headlamp that includes low and high beam with signature position lighting. LED Bullet Turn Signals and LED stop/tail/turn elements in back align function with form, elevating conspicuity and reliability while reducing maintenance. The result is a lighting package that looks purposeful in daylight and projects a bright, even spread at night. The cohesive LED system not only enhances visibility to others on the road but also underscores the premium fit-and-finish that defines the model.

Dual-Bending Valve 49 mm Front Fork and Hidden Monoshock

A 49 mm telescopic front fork with dual-bending valve technology delivers well-damped response over a range of road surfaces, while aluminum triple clamps ensure rigidity and precise alignment. In back, a hidden, free-piston coil-over monoshock keeps the lines clean without sacrificing function, offering 43 mm of stroke and hydraulic preload adjustment. This setup allows riders to quickly tailor the ride for solo or two-up use and for variations in luggage. With a laden seat height of 25.9 inches and 4.9 inches of ground clearance, the Fat Boy® balances approachability with lean angles of 25.6 degrees on both sides, supporting real-world maneuverability without compromising the iconic stance.