How to Do a Tire PSI Chalk Test

Check Proper Tire Inflation for Your Jeep

Running the right tire pressure is critical for both safety and performance, especially if you’ve upgraded to larger tires. Over-inflated tires wear unevenly in the center, while under-inflated tires wear on the edges. So how can you tell if your Jeep’s tires are properly inflated? One simple and effective way is the tire PSI chalk test.

Why Proper Tire Inflation Matters

Tire pressure affects ride quality, traction, and tread life. Running the correct PSI ensures even wear, maximizes performance on and off-road, and reduces the risk of tire failure. With bigger tires, like my 35” Duratracs LT 315/70R/18, getting your PSI dialed in becomes even more important.

Tools You’ll Need

Performing a chalk test requires just a few basic items:

• Chalk

• Tire pressure gauge

• A flat, smooth surface (like a driveway or paved road)

These simple tools help you see how much of your tire tread actually contacts the ground.

Tools for chalk test: chalk and tire pressure guage

Step-by-Step Tire PSI Chalk Test

Step 1: Check Your Current Tire Pressure

Use a tire gauge to measure the PSI of all four tires. On my Jeep, three of my tires read 31 PSI, and the rear driver-side tire was 29 PSI. This baseline lets you know where your tires are before making adjustments.

using the tire pressure guage to measure pressure

Step 2: Apply Chalk to the Tread

Draw a thick line of chalk across the width of each tire tread. Make sure the chalk line is even so you can clearly see which parts of the tread contact the ground.

putting chalk on tire 

Step 3: Drive on a Flat Surface

Drive back and forth over a flat surface, like your repaved driveway. Avoid cracks, potholes, or steep inclines so your results aren’t skewed. This helps transfer the chalk from the tire to the pavement.

chalk on tire before measuring

Step 4: Inspect the Chalk

Check where the chalk made contact with the ground. Here’s what to look for:

• Over-inflated tire: Only the center of the tread touches the ground; the chalk line will show a gap on the edges.

• Under-inflated tire: Only the sides of the tread touch the ground; the middle of the chalk line will be missing.

• Properly inflated tire: The chalk line is even across the tread, indicating full contact.

Knowing the true edges of your tread makes it easier to see if your tires are hitting the pavement correctly. After testing, I found my tires were spot-on, running around 30–32 PSI on asphalt.

Before with chalk

After when the Jeep has been driven

Showing the edge of the tire

Step 5: Adjust as Needed

If your chalk test shows uneven contact, adjust your PSI accordingly and re-test. Remember that tire width, vehicle load, and terrain can all affect your ideal PSI.

Tips & Considerations

• Tire width: Wider tires spread the weight differently, so PSI might need slight adjustments.

• Temperature: Cold weather lowers PSI; hot weather raises it. Always check tires when they’re cold.

• Tire type: Different tread patterns and off-road tires may behave differently in a chalk test.

The Nexen Tires have so far been my favorite tires both on and off-road. 

Troubleshooting Common Tire PSI Issues

Even after performing a chalk test, your Jeep’s tires may not behave exactly as expected. Here’s how to troubleshoot common problems:

1. Chalk Line Shows Only Center Contact (Over-Inflated)

• Cause: PSI is too high, causing the middle of the tread to bear most of the weight.

• Fix: Slowly reduce tire pressure in 1–2 PSI increments, then re-test with chalk until the tread contacts the ground evenly.

2. Chalk Line Shows Only Edge Contact (Under-Inflated)

• Cause: PSI is too low, causing the sides of the tread to flex more than the center.

• Fix: Gradually increase tire pressure, checking after each adjustment, until the chalk line is even.

3. Uneven Chalk Transfer Between Tires

• Cause: Uneven driveway, soft pavement, or different tire wear patterns.

• Fix: Use the flattest surface possible and check for tire irregularities. Rotating tires or checking alignment may help.

4. Tires Lose Pressure Quickly After Adjustment

• Cause: Small leaks, valve stem issues, or bead seating problems.

• Fix: Inspect tires for punctures, tighten valve stems, or consult a tire shop if the problem persists.

5. Chalk Wears Off Too Quickly

• Cause: Tires may be too dirty or wet, or chalk applied too lightly.

• Fix: Clean tires and apply a thicker line of chalk for better visibility.

Pro Tip:

Check tire pressure regularly, especially with larger off-road tires. Environmental factors like temperature changes and off-road adventures can affect PSI, so make the chalk test part of your routine maintenance.

FAQs: Tire PSI Chalk Test

Q1: What is a tire PSI chalk test?
A simple method to check if your tires are properly inflated by marking the tread with chalk and seeing which parts contact the ground after driving a short distance.

Q2: How often should I check tire PSI?
At least once a month or before long trips. After off-roading or heavy hauling, check PSI again.

Q3: Can I rely only on a chalk test to set tire pressure?
It’s a great visual guide, but factors like tire size, load, and road type mean you should also reference the manufacturer’s recommended PSI.

Q4: What happens if my tires are over- or under-inflated?
Over-inflation wears the center of the tread; under-inflation wears the edges. Both can affect handling, traction, and safety.

Q5: Does tire temperature affect the chalk test?
Yes, always check tires when cold. Driving heats them up, temporarily increasing PSI and potentially skewing results.

AOAA Adventure - The Unexpected Joys of Jeeping

Embracing Adventure with New Friends and My Jeep

When I first bought my Jeep, little did I know that it would steer my life into a new lane filled with adventure and friendships. Jeeping isn't just about conquering rugged terrains; it's about the camaraderie that binds enthusiasts from all walks of life. This tight-knit community is more than willing to welcome newbies with open arms. My off-road adventures over the years are filled with stories just like this one. 

Iconic AOAA Photo Stop

A Chance Encounter with New Trails and New Friends

Meet Nate, known as SWBCrawler. I met him a few times at Rausch Creek, my usual stomping grounds for off-roading. We never wheeled together there but were on a podcast together for a short stint. 

Nate, SWBCrawler

Rausch Creek Off-road Park, nestled in the mountains of Eastern Pennsylvania, features rocky trails that twist through dense forests—a playground for any off-road enthusiast. Not far from there lies the Anthracite Outdoor Adventure Area (AOAA), where the landscape morphs into the rugged terrains of the Western Middle Coal Field, offering a different flavor of challenges and scenery. This is where the day's adventure took place, somewhere new and unexplored by me. 

My Jeep on a rocky trail at AOAA. 

I was invited by Nate and his crew to explore the trails at AOAA. As I drove up into the mountains, my feelings were a mix of anticipation and anxiety. Excitement bubbled within me at the thought of hitting the trails again, but there was also a twinge of nervousness. As someone who wheels cautiously, I worried about slowing down the group with my careful maneuvers.

This is now a Jeep Badge of Honor Trail 👉Barney Rubble Trail, AOAA

BA Trail 👉 BA Trail

Learning the Ropes with Understanding Companions

But my fears were quickly put to rest. Nate’s friends, Jason and Blaine, turned out to be exceptional spotters. They guided me through the trails with a keen understanding of my situation—like me, they too drove their off-road Jeeps daily. Their patience and expertise helped ease my apprehension, making the experience enjoyable rather than stressful.
Interestingly, the off-roading world is smaller than one might think. During our adventure, I realized that two other Jeeps in our group were familiar—they were folks I had met on previous excursions at Rausch Creek. The community’s interconnectedness added an extra layer of comfort and familiarity to the day.

Hood shot of the Jeeps in front on a trail ride. 

Gaining Confidence One Trail at a Time

One profound piece of advice I've carried with me came from Kyle during a 301 training class: "Your Jeep is more capable than the trails you're on." This insight has stuck with me, slowly transforming my cautious approach into one of confident exploration. Each journey not only hones my driving skills but also builds my self-assurance, thanks to the encouragement from more seasoned Jeepers.

My Jeep crawling rocks at AOAA.

A Journey of Self-Discovery and Friendship

What started as a solitary purchase of a Jeep has morphed into a journey of self-discovery and camaraderie. The off-roading adventures have not only introduced me to new trails but have also woven new friendships into the fabric of my life. If you’re on the fence about diving into the world of Jeeping, remember this: sometimes, putting yourself out there is the first step towards incredible adventures and unexpected friendships. So buckle up, embrace the nervous excitement, and hit the trails—you never know where they might lead you!

Jeep Momma selfie

My Jeep in the woods. 

Steel vs Aluminum Jeep Wheels

Pros, Cons, and Off-Road Considerations

Choosing the right wheels for your Jeep can make a big difference in performance, durability, and style—especially if you’re hitting off-road trails. Whether you’re a mud or sand Jeeper, rock crawler, desert racer, or mall crawler, your choice between steel and aluminum wheels depends on how you use your Jeep. In this guide, we’ll break down the pros and cons of both options to help you make the best decision for your adventure.

Check out my other Modification blog posts from interior mods to Must Have when off-roading.

My Jeep with Steel Wheels.

How to Choose the Right Wheels for Your Jeep

Define Your Jeep’s Purpose

Before you decide, consider how you’ll use your Jeep:

• Mud or sand Jeeper: Wheels need durability and the ability to handle soft terrain.

• Rock crawler: Reparability is key in case of dents or bends.

• Desert racer: Lightweight wheels improve acceleration and reduce fatigue on suspension.

• Mall crawler: Aesthetic appeal and design may be more important than durability.

Steel Wheels for Jeep – Pros and Cons

Pros of Steel Wheels

• Durability: Can withstand heavy off-road use and are less likely to crack or bend.

• Affordability: Generally cheaper than aluminum wheels, great for budget-conscious off-roaders.

• Repairability: Steel wheels can often be hammered back into shape in the field.

• Weight Benefits: Added unsprung weight can help keep tires planted on uneven terrain.

Cons of Steel Wheels

• Corrosion: More prone to rust than aluminum, though protective coatings can help.

• Weight Drawbacks: Heavier weight can reduce fuel efficiency and acceleration.

• Limited Customization: Fewer design and finish options for aesthetic appeal.

Aluminum (Alloy) Wheels for Jeep – Pros and Cons

Pros of Aluminum Wheels

• Lightweight: Improves fuel efficiency and acceleration.

• Corrosion Resistance: Better for wet or humid conditions.

• Aesthetic Appeal: Wide variety of designs and finishes for a custom look.

Cons of Aluminum Wheels

• Durability: More prone to cracking or bending under extreme off-road use.

• Repairability: Damaged wheels often must be replaced rather than repaired.

• Cost: Typically more expensive than steel wheels.

Key Considerations for Off-Roading

When deciding between steel and aluminum wheels for serious off-roading:

• Durability: Steel wheels were traditionally more durable, but modern alloys are much stronger.

• Weight: With larger tires (35” or 37”), weight differences become less noticeable.

• Reparability: Steel wheels can often be repaired in the field, which is critical on remote trails.

• Performance: Aluminum wheels may offer slight performance benefits due to lighter weight.

• Aesthetics: Aluminum wheels provide more design options if style is important.

Ultimately, your choice depends on your off-road needs and priorities. Steel wheels may be better for extreme off-roading or remote trips, while alloy wheels strike a balance of performance, durability, and appearance.

Troubleshooting Common Wheel Issues

Even the right wheels can run into problems. Here’s what to watch for:

1. Cracked Aluminum Wheel

• Cause: Hitting rocks or extreme terrain.

• Fix: Replace immediately; aluminum usually cannot be safely repaired.

2. Rusted Steel Wheel

• Cause: Exposure to moisture and road salts.

• Fix: Apply a protective coating and check wheel integrity before trips.

3. Bent Steel Wheel

• Cause: Off-road impacts.

• Fix: Steel wheels can often be hammered back into shape; inspect thoroughly afterward.

4. Uneven Tire Wear

• Cause: Misalignment or incorrect PSI combined with wheel type.

• Fix: Check alignment, rotate tires, and adjust tire pressure as needed.

FAQs: Steel vs Aluminum Jeep Wheels

Q1: Are steel or aluminum wheels better for off-roading?
It depends on your Jeep’s purpose. Steel wheels are better for extreme off-roading due to durability and reparability, while aluminum wheels offer performance and aesthetic benefits.

Q2: Can I repair a steel wheel in the field?
Yes, steel wheels can often be hammered back into shape, which is a major advantage on remote trails.

Q3: Do aluminum wheels improve fuel efficiency?
Yes, aluminum wheels are lighter than steel, which can slightly improve fuel efficiency and acceleration.

Q4: What wheel type is best for larger tires?
For 35” or 37” tires, the weight difference between steel and aluminum wheels is less significant, so choose based on durability and off-road needs.

Q5: How does wheel weight affect Jeep handling?
Heavier wheels (steel) can increase traction off-road but may reduce acceleration and fuel efficiency on-road. Lighter wheels (aluminum) improve handling and responsiveness but may be more prone to damage.

Final Verdict: Which Wheel Type is Right for You?

Both steel and aluminum wheels can be suitable for Jeeps, depending on your needs. If you prioritize reparability, durability, and budget, steel wheels are your go-to choice. If you prefer performance, style, and corrosion resistance, aluminum wheels offer a great balance. Consider your terrain, driving habits, and personal preference before making the final decision.

✅ Pro Tip: Keep both types of wheels maintained. Steel wheels should be inspected for rust, while aluminum wheels should be checked for cracks or bends after tough off-road trips.

How to Replace Your Jeep Brake Light

Simple DIY Maintenance

Your Jeep’s dashboard alert is trying to tell you something—like a burned-out brake light. Luckily, replacing a Jeep brake light is simple, quick, and can be done in about five minutes with just a few basic tools. In this guide, I’ll walk you through the step-by-step process so you can fix it yourself and save time and money.

Check out my other Jeep Momma How To's for more DIY maintenance tips.

Why Replace Your Brake Light Yourself?

Replacing your own brake light is easy, prevents traffic tickets, and keeps your Jeep safe. You don’t need special skills or tools—just patience and a little attention to detail. Doing it yourself also ensures you understand how your Jeep’s lighting system works for future maintenance.

Tools You’ll Need

• Screwdriver or drill

• Replacement brake light bulb

• Optional: Gloves for easier grip

Step-by-Step Brake Light Replacement

Step 1: Identify the Burned-Out Bulb

When the dashboard “dinged,” my Jeep clearly indicated the rear left brake light was out. Check your dash for warning lights or do a visual inspection of your brake lights before starting.

Jeep Momma Do-It-Yourself Brake Light Replacement

Step 2: Remove the Brake Light Housing

Carefully remove the four screws securing the tail light housing. If your Jeep has a headlight or tail light cover, be mindful of spacers—they can easily fall off and roll across your garage floor. I forgot about them and spent another ten minutes looking for them after two had bounced around on my garage floor.  

Pro Tip: Keep a small tray handy to catch screws and spacers so they don’t get lost.

Removing Screws from the Jeep Wrangler Brake Light

Jeep Wrangler Brake Light

Step 3: Remove the Bulb

Once the housing is off, turn the bulb counterclockwise about a quarter turn to remove it. The bulb is safe to touch; unlike some headlights, brake light bulbs don’t get hot enough for oils from your fingers to matter.

Jeep Wrangler Brake Light Bulb

Step 4: Test the New Bulb

Before reassembling, install the new bulb and test both the brake and blinker functions to ensure everything works correctly. This saves you the hassle of taking it apart again if something isn’t working.

Step 5: Reassemble the Tail Light

Once tested, put the bulb back in the housing, secure the screws, and replace any covers. Make sure all spacers are in place to avoid rattling or misalignment.

Troubleshooting Common Brake Light Issues

Even simple replacements can have hiccups. Here’s how to troubleshoot:

• New bulb doesn’t light up: Check for blown fuses or faulty wiring.

• Housing won’t sit flush: Make sure all spacers are in place and screws aren’t cross-threaded.

• Dashboard still shows warning: Sometimes the dash needs a few key cycles (on/off) to reset after replacing the bulb.

FAQs: Jeep Brake Light Replacement

Q1: How long does it take to replace a Jeep brake light?
Usually 5–10 minutes if you have the proper tools and replacement bulb.

Q2: Do I need to wear gloves when handling the bulb?
It’s optional. The bulbs don’t get hot enough for oil from your fingers to matter.

Q3: Can I replace LED brake lights the same way?
Yes, the process is similar, but make sure your replacement LED is compatible with your Jeep model.

Q4: What type of bulb does my Jeep use?
Check your Jeep owner’s manual or the markings on the old bulb for size and type.

Q5: How can I prevent losing screws or spacers?
Use a small tray or magnetic container to hold all small parts during the replacement process.

Replacing your Jeep brake light is an easy DIY project that keeps your vehicle safe and street-legal. With a few tools and a little attention to detail, you can fix a burned-out brake light in minutes—no trip to the mechanic needed.