Rocker Panel

Rocker Panels, Nerf Bars & Side Steps: Function Meets Style

The rocker panel runs along the lower sides of your truck or SUV, sitting between the front and rear wheel wells just beneath your doors. It's one of the most exposed structural areas on any vehicle — constantly in the line of fire from road debris, trail obstacles, and the daily grind of stepping in and out. Whether you're looking to add a convenient step, shield that vulnerable sheet metal from damage, or simply give your build a more aggressive stance, rocker panel accessories are one of the most impactful upgrades you can make.

Step nerf bars are the most popular choice in this category. Originally designed for the racing world to prevent tires from bumping into each other, nerf bars are tubular side steps that run along the rocker panels and under the doors of a truck or SUV. Nerf bars are typically made from either stainless steel, chrome, or powder-coated steel, although there are considerable variations in style and design. For those who want a complete, ready-to-install solution, step nerf bar kits bundle the bars with all required mounting hardware and brackets — ideal for a clean, straightforward installation.

Sometimes referred to as nerf bars, step bars, and side steps, the primary function of the side bar is to provide a sturdy step into the vehicle. Like a side bar, a running board provides a stepping surface, but it generally mounts flush against the vehicle's rocker panel, is typically wider, and has an overall flatter profile. Beyond pure accessibility, protecting the rocker panel is a key benefit — bars and steps serve as a barrier to wayward obstacles on the trail, and depending on the footprint, side steps also offer varying degrees of coverage from rocks and debris shooting up from the wheels.

For drivers who go beyond paved roads, rocker panel guards and rock sliders take protection to the next level. While nerf bars and running boards focus on entry and exit convenience, rock sliders are all about off-road protection — built from heavy-duty steel or alloy tubing, they shield your vehicle's rocker panels from damage when navigating boulders, logs, or rough terrain. You'll also want to consider running board mount kits, which ensure your steps are secured properly and can be the difference between a rock-solid installation and one that shifts over time.

Top Brands for Rocker Panel Accessories

When it comes to this category, a few names consistently rise to the top. Westin is the dominant force in rocker panel steps and nerf bars. Westin offers a wide selection of side steps in numerous configurations — including styles, materials, and finishes — and their products are vehicle-specific, meaning they're specially engineered to fit particular applications, with all brackets and hardware as direct fits for simple, no-drill installation. Westin also backs each product with an industry-leading warranty.

APS (Auto Parts Specialist) is well known for their iBoard line of running boards and nerf bars. Their premium truck steps feature simple bolt-on installation and include all necessary hardware, with no drilling required on most applications. APS iBoards are made from aircraft-grade 6061-T6 aluminum with a full-length, UV-resistant, high-grip tread for secure footing and anti-slip protection.

Rock Slide Engineering is the go-to choice for serious off-road enthusiasts. Their Step Sliders are trail-rated and rated for moderate off-road conditions, integrating a power step for easy access. RSE engineers have incorporated Smart Motor technology to keep the step deploying and retracting consistently even in cold and harsh weather, and the sliders also provide direct protection for the rocker panel.

Steelcraft brings precision manufacturing to this category. Steelcraft proudly manufactures its running boards and nerf bars in the company's Southern California manufacturing plant, using only the highest-quality base materials and finishes. Their products feature an innovative track system, allowing you to fine-tune the side step's mounting position to ensure the greatest balance of accessibility, looks, and rocker protection.

Sherman rounds out the top brands with a focus on direct-fit replacement rocker panels — an essential option for anyone dealing with rust, corrosion damage, or collision repair who needs to restore structural integrity before adding any accessories.