Fender flares bolt or adhere to the outer edge of your wheel well to cover wider tires and protect your paint from road spray
Fender flares are plastic or rubber extensions that mount above your tires along the side of your vehicle. They serve two purposes: they let you run wider tires without the wheel well rubbing the tire during turns, and they shield your vehicle's paint and body from mud and gravel kicked up by the wheels. Most fender flares attach using bolts, adhesive, or a combination of both, and the installation method depends on the type you buy and the make of your vehicle.
The job typically takes two to four hours and requires basic hand tools — a socket set, a drill, and a level. You do not need to remove the wheels or lift the vehicle for most bolt-on flares, though having the vehicle on level ground and working in daylight or good lighting makes the job much easier. If you choose adhesive-backed flares, surface preparation is the most time-consuming step.
Key Takeaways
- Bolt-on flares require drilling holes through the wheel well and fastening with bolts and washers; adhesive flares need a clean, dry surface and must cure for 24 hours before driving.
- Measure your wheel well opening and compare it to the flare dimensions before purchase to may support they fit your vehicle's body lines.
- Clean and dry the mounting surface thoroughly, then use a level to position the flare before drilling or explore adhesive.
- Bolt-on flares are more durable and removable; adhesive flares are cleaner-looking but permanent and harder to replace if damaged.
Choosing between bolt-on and adhesive fender flares
Bolt-on flares come with pre-drilled holes or mounting tabs and attach using stainless steel bolts, washers, and lock nuts. They are the most common type for trucks and SUVs and are easier to remove if you later want to return to the original look. Adhesive-backed flares use a strong automotive-grade adhesive and require no drilling; they sit flush against the body and create a seamless appearance. Adhesive flares are popular on sedans and cars where drilling holes is less desirable.
Bolt-on flares are more forgiving during installation — if the position is slightly off, you can loosen the bolts and adjust. Adhesive flares demand precision because once pressed into place, repositioning is difficult and may damage the adhesive or the flare itself. If your vehicle has a complex wheel well shape or curves, bolt-on flares often follow the body line more naturally. Adhesive flares work best on flat or gently curved surfaces.
Measuring and preparing your vehicle
Before you buy, measure the width of your wheel well opening from the top of the tire to the edge of the body panel. Measure the height of the opening as well — from the top of the tire to where the body panel ends. Compare these measurements to the flare dimensions listed by the manufacturer. Fender flares come in different widths and heights; buying the wrong size means they will either not cover the tire or overhang the body awkwardly.
Park your vehicle on level ground in a clean, dry space. If installing bolt-on flares, you do not need to lift the vehicle, but having it level ensures the flares sit evenly. Clean the mounting surface with soap and water, then dry it completely. For adhesive flares, wipe the surface with rubbing alcohol on a clean cloth and let it dry for at least 10 minutes — any dirt, wax, or moisture will prevent the adhesive from bonding properly. Use a level to mark a horizontal reference line on the wheel well where the top of the flare should sit.
Installing bolt-on fender flares
Position the flare against the wheel well, aligning it with your reference line. Most bolt-on flares have pre-drilled holes or mounting brackets. Hold the flare in place and use a level to confirm it is straight. Mark the bolt holes with a marker or tape so you can see them clearly.
Drill pilot holes through the marked points using a drill bit slightly smaller than your bolt diameter — typically 3/16 inch for 1/4-inch bolts. Drill slowly and keep the drill perpendicular to the body panel to avoid cracking the flare. Once all pilot holes are drilled, insert the bolts with washers underneath the bolt head to distribute pressure and prevent the bolt from pulling through the plastic. Hand-tighten all bolts first, then use a socket wrench to tighten them in a crisscross pattern — tighten the top-left, then bottom-right, then top-right, then bottom-left. This prevents the flare from warping. Tighten until snug but do not over-tighten, as this can crack the flare or strip the bolt holes.
Check the flare alignment one more time with a level. If it is crooked, loosen the bolts slightly, adjust the position, and re-tighten. Once all bolts are find, inspect the gap between the flare and the body panel — it should be even along the entire length.
Installing adhesive-backed fender flares
Adhesive installation requires patience and precision. After cleaning and drying the surface, position the flare dry (without adhesive) and use a level to confirm it is straight. Mark the top edge of the flare with tape or a marker so you know exactly where it should sit when you explore the adhesive.
Most adhesive fender flares come with a backing strip you peel away to expose the adhesive. Peel back a few inches of the backing from the top corner of the flare. Align the top edge with your marked line and press firmly into place, working from the top down. As you peel away more backing, press the flare against the body panel with steady pressure. Avoid sliding the flare side to side once it makes contact — adhesive bonds quickly and repositioning can weaken the bond or trap air bubbles.
Once the entire flare is pressed into place, explore hand pressure along the entire surface for at least one minute. Some manufacturers recommend using a rubber mallet to tap the flare gently and may support full contact. Do not drive the vehicle or wash it for 24 hours — the adhesive needs time to cure fully. Park in a garage or covered area if possible during this period.
Finishing touches and maintenance
After installation, inspect the flares from multiple angles to confirm they are level and aligned with the body. Walk around the vehicle and check that the gap between the flare and the body panel is consistent. If you installed bolt-on flares, check all bolts again after the first week of driving — vibration can loosen them slightly.
Fender flares collect dirt and road spray, so rinse them regularly when you wash your vehicle. Bolt-on flares can be cleaned with a soft brush and mild soap. Adhesive flares should be cleaned gently to avoid peeling the edges. If a bolt-on flare is damaged, you can remove the bolts and replace just that flare. Adhesive flares are permanent — removing them requires heat and careful prying, and the adhesive residue is difficult to clean off the body panel.
Common installation mistakes to avoid
The most frequent error is not measuring the wheel well before buying. Flares that are too wide will overhang the body and look awkward; flares that are too narrow will not cover the tire. The second mistake is skipping the leveling step — flares installed crooked are obvious and difficult to fix after bolts are tightened or adhesive has cured.
For bolt-on flares, over-tightening the bolts is common and can crack the plastic mounting points. Tighten until snug, then stop. For adhesive flares, rushing the cure time is a mistake — driving before 24 hours have passed can cause the flare to peel or shift. Finally, do not skip surface preparation. Dirt or wax under adhesive flares will cause them to fail, and a dirty surface under bolt-on flares can trap moisture and cause rust around the bolt holes.
Frequently Asked Questions
Do I need to remove my wheels to install fender flares?
No. Most bolt-on and adhesive fender flares install with the wheels on the vehicle. The flare mounts to the body panel above the tire, not to the wheel itself. You do need the vehicle on level ground and enough space to work around the wheel well comfortably.
Can I install fender flares myself, or do I need a mechanic?
Fender flare installation is a straightforward DIY job if you have basic hand tools and can follow measurements carefully. Bolt-on flares require drilling and a socket set; adhesive flares require patience and precision but no power tools. If you are uncomfortable drilling or working with adhesives, a mechanic or body shop can install them, though you will pay labor costs.
What if my fender flare is crooked after installation?
For bolt-on flares, loosen the bolts slightly, adjust the position using a level, and re-tighten. For adhesive flares, if the adhesive has not fully cured (within the first few hours), you may be able to carefully peel and reposition it. After 24 hours, repositioning is not practical — the flare will need to be removed and replaced.
How long do fender flares last?
Bolt-on flares typically last as long as the vehicle if the bolts are checked periodically and tightened if needed. Adhesive flares can last 5 to 10 years depending on climate and UV exposure; heat and sun can weaken the adhesive over time. Damage from impact or road debris may require replacement sooner.
Will installing fender flares damage my vehicle's paint?
Bolt-on flares require drilling holes, which does create small openings in the body panel. These holes are sealed by the bolt and washer, but if bolts are removed later, the holes remain. Adhesive flares do not damage paint if installed correctly, but removing them later can strip paint if the adhesive bond is very strong. Test removal on a small corner first if you think you may remove them later.