ADV Fiberglass: Prerunner Fenders & Bedsides Guide

ADV Fiberglass is a U.S.-based manufacturer of hand-laid fiberglass fenders and bedsides that widen a prerunner’s bodywork to clear bigger tires and long-travel suspension. Their bolt-on front fenders and rear bedsides are among the most common ways builders convert a stock pickup into a wide-bodied desert truck.

If you have ever seen a Tacoma or Ranger with fenders that bulge several inches past the door line, there is a good chance you were looking at ADV Fiberglass parts. Wide fiberglass is a core ingredient in almost every prerunner build, because long-travel suspension throws the tires far outboard of where the factory sheet metal ever intended them to sit. This hub covers ADV’s product lines, flare widths, finishing options, and platform fitment. For the broader category and how fiberglass stacks up against steel and metal flares, start with our fiberglass fenders and bedsides guide.

Who is ADV Fiberglass?

ADV Fiberglass is a domestic manufacturer that hand-lays fiberglass off-road body panels in the United States. The catalog is built around two product categories that matter most to prerunner builders: front fender flares and rear bedsides. Panels typically ship in a semi-gloss white gel coat as standard, and the company also offers custom gel-coat colors and, on some special orders, carbon fiber. Because everything is hand-laid rather than mass-molded, expect a lead time of roughly two to four weeks when parts are not in stock.

The appeal for desert-truck builders is straightforward: fiberglass is lighter than steel, it will not dent when a rock kisses it, and it can be molded into far more aggressive shapes than a factory press could ever stamp. That combination of light weight and extra tire clearance is exactly what a long-travel front end needs.

Front fenders: widths and rise

ADV’s front fenders are typically sold in sets of two and are offered in a couple of flare profiles depending on how far your build pushes the tires out. The two dimensions that matter are flare (how far the fender extends outward past stock) and rise (how much taller the wheel opening sits, for suspension uptravel).

• Standard flare — commonly around a 4-inch flare with roughly a 2-to-3-inch rise. This is the everyday prerunner fender: it generally clears 33- to 35-inch tires and pairs well with mild to moderate long-travel kits.
• Wide race flare — often listed around a 6.5-inch flare (some platforms list closer to 6-inch) with a 3-to-4-inch rise. This is aimed at dedicated long-travel and race-style front ends running larger rubber and maximum wheel travel.

Some applications add optional fender extensions or bumper caps that tie the fender into the front bumper for a cleaner, more finished look. Which width is right depends entirely on your suspension geometry, so confirm your travel numbers and wheel offset before ordering.

Rear bedsides

ADV’s rear bedsides replace the factory bed panels with wider fiberglass that visually and functionally matches the front fenders. On many applications the bedsides come standard in the same semi-gloss white gel coat and often include a built-in fuel-fill area so you do not have to fabricate a workaround for the gas cap. Matching the front flare and rear bedside profile is what gives a finished prerunner that cohesive, purpose-built stance rather than a mismatched “flares bolted on” look.

Finishing: raw, paint, or Line-X

Because panels arrive in gel coat rather than a color-matched finish, you will choose a finishing path. The three most common approaches are:

• Raw / gel coat — run the panels as delivered in semi-gloss white (or a custom gel-coat color). Cheapest and fastest; popular on budget and work-in-progress builds.
• Paint — have a body shop prep and spray the fiberglass to match your truck. Fiberglass requires proper prep and priming, so this is best left to a pro for a lasting finish.
• Line-X (or spray-on bedliner) — a textured protective coating that hides minor imperfections, resists rock chips, and gives a tough, utilitarian look. This is a very common choice on hard-use desert trucks because it shrugs off trail abuse better than paint.

None of these are ADV-exclusive services in most cases; they are done locally, and a good fab or body shop can advise on prep for whichever route you pick.

Platforms and fitment

ADV’s strength is breadth of coverage across popular prerunner platforms. Applications generally span popular Toyota, Ford, and GM trucks and SUVs across multiple generations, though you should always confirm current fitment for your specific year and model:

All panels are marketed as bolt-on, but “bolt-on” in the fiberglass world still means trimming, test-fitting, and often minor massaging to line everything up perfectly. Because fiberglass is thicker than OEM steel and hand-laid parts carry small variances, professional or at least experienced installation is strongly recommended.

Which ADV Fiberglass product for your build?

Match the flare to your suspension, not the other way around:

• Street-driven / mild prerunner — standard-width front fenders (around 4-inch flare) are plenty. They generally clear 33-35s, keep the truck closer to legal width, and look clean painted to match. Good fit if you care whether your truck stays street legal.
• Full long-travel desert build — go with the wide race flare front (around 6.5-inch) and matching bedsides to cover the extra tire and travel. Line-X finishing pairs naturally with this hard-use tier.
• Budget build in progress — run the gel-coat panels raw for now and paint later. Fiberglass is one of the more cost-effective width upgrades relative to a full prerunner build budget.

As a rough guide, front fender sets commonly land in the neighborhood of $700-$1,000 depending on platform and options, with bedsides and wide-flare or carbon variants typically running higher. Treat those as ballpark figures and confirm current pricing directly. You can view the full catalog and current applications at advfiberglass.com.

Frequently Asked Questions

Are ADV Fiberglass fenders a true bolt-on install?

They are designed to bolt on and are marketed that way, but expect to trim, test-fit, and align the panels for a clean result. Fiberglass is thicker than factory steel and hand-laid parts have small variances, so most builders have a shop handle final fitment and finishing.

What tire size will ADV fenders clear?

It depends on the flare width and your suspension. The standard roughly 4-inch flare typically clears 33- to 35-inch tires with a mild long-travel setup, while the wider race flare is built for larger rubber and full-travel front ends. Always verify against your specific wheel offset and travel numbers.

Do the fenders come painted?

Typically no. Panels usually ship in a semi-gloss white gel coat (custom gel-coat colors are available). From there most builders either run them raw, have a body shop prep and paint them to match the truck, or coat them in Line-X for a durable textured finish.