What To Put Under Tires When Storing Car

If you are preparing your car for long-term storage, you know every detail matters. A common question is what to put under tires when storing car to protect them. The short answer is that placing flat wooden boards or specialized plastic tire cradles under your tires helps prevent flat spots during long-term storage.

Flat spots are a real problem when a vehicle sits in one place for months. The tire’s contact patch can become permanently deformed. This guide will walk you through the best materials to use, why they work, and how to properly prepare your entire vehicle for storage.

The primary goal is to distribute the vehicle’s weight evenly and prevent the tire rubber from developing a memory of a flat position. You have several good options, each with its own advantages.

Flat Wooden Planks Or Plywood

This is a classic, cost-effective solution that works very well. You need planks that are at least 1-inch thick to handle the weight without bowing. Pressure-treated lumber is best as it resists moisture from the floor.

Cut pieces slightly larger than the footprint of each tire.
Ensure the wood is completely flat and free of knots that could crack.
Place one plank under each tire, centering the tire on the wood.

This method spreads the load over a wider area, reducing pressure on the tire’s contact patch. It’s a reliable choice for storage in a dry garage.

Specialized Tire Cradles Or Pads

These are plastic or composite ramps designed specifically for tire storage. They support the tire’s entire circumference with a curved surface, which is the ideal scenario.

They perfectly mimic the tire’s natural shape under load.
Made from durable plastic that won’t rot or retain moisture.
Often have a non-slip surface to keep the tire in place.

While more expensive than wood, tire cradles are arguably the best technical solution for preventing flat spots, especially for high-performance or classic cars.

High-Density Foam Mats Or Carpet Remnants

A softer alternative, thick foam exercise mats or clean carpet pieces can provide a cushioned barrier. This is better than leaving tires directly on concrete, but it’s not the most effective method for very long periods.

Use only if storage is for a few months at most.
Ensure the material is completely dry to prevent mildew.
It primarily insulates the tire from cold, moisture-wicking concrete.

This method is less about preventing flat spots and more about protecting the tire from the floor’s environment.

What You Should Avoid Using

Not everything is suitable for this job. Using the wrong materials can cause more harm than good.

Cardboard or Newspaper: These compress flat and absorb moisture, offering no real support and potentially promoting rust on the floor underneath.
Thin Plastic Sheets or Tarps: These can trap moisture against the tire rubber, leading to dry rot or sidewall cracking.
Dirt or Gravel: Uneven surfaces put stress on the suspension and do not provide stable, even support.

Stick with solid, stable, and dry materials designed to bear weight.

Why Proper Tire Support Is Critical

Understanding the “why” makes it easier to commit to the process. The consequences of improper storage go beyond a bumpy ride.

Preventing Permanent Flat Spots

Modern radial tires are more resistant to flat spotting than old bias-ply tires, but they are not immune. When a car sits, the weight causes the rubber compounds in the contact patch to oxidize and stiffen in that position.

Initially, you’ll feel a thumping vibration when you first drive the car. Often, this will smooth out after the tires warm up. However, after very long storage (6+ months), the deformation can become permanent, requiring new tires—an expensive mistake.

Protecting Tire Sidewalls And Structure

Consistent, even support prevents undue stress on the sidewall where it meets the tread. An underinflated tire sitting on a hard surface can develop cracks in this area. Supporting the tire properly helps maintain its structural integrity.

Shielding Against Concrete Moisture

Concrete floors actively wick moisture. Placing a tire directly on concrete can lead to the rubber absorbing that moisture, which can accelerate aging and cause the steel belts inside to rust. A wooden or plastic barrier breaks this contact.

Step-By-Step Guide To Preparing Your Car For Storage

Proper tire support is just one part of a complete storage routine. Follow these steps to ensure your car comes out of storage in great shape.

Clean The Car Thoroughly

Never store a dirty car. Dirt, sap, and bird droppings can etch into the paint over months.

Wash the exterior with car soap and dry it completely.
Apply a coat of wax or sealant for a protective barrier.
Clean the interior, vacuuming carpets and wiping down surfaces to prevent mold.

Perform Fluid Maintenance

Stagnant fluids can lead to problems.

Change the oil and filter to remove acidic contaminants.
Top off all other fluids, including coolant and brake fluid.
Fill the fuel tank completely to prevent condensation and add a fuel stabilizer. Run the engine for 5 minutes to circulate the treated fuel.

Prepare The Battery

A battery left connected will go dead. For storage over a month, you have two good options.

Disconnect the negative battery cable to prevent parasitic drain.
Better yet, connect the battery to a smart battery maintainer or trickle charger. This keeps it at optimal voltage without overcharging.

Positioning And Supporting The Tires

This is where your chosen materials come into play.

Inflate all tires to the maximum pressure listed on the sidewall (not the door jamb sticker). This provides extra rigidity.
Move the car to its final storage spot. Ensure the parking brake is OFF to prevent the brakes from seizing. Use wheel chocks instead.
Place your wooden planks, tire cradles, or pads directly under each tire, ensuring they are centered.

If you have the space and resources, consider lifting the car onto jack stands to take the weight completely off the tires and suspension. This is the ultimate protection but must be done safely with stands rated for the vehicle’s weight.

Final Protective Measures

A few last steps will seal the deal.

Plug the tailpipe and any other engine bay openings with steel wool to deter rodents.
Place moisture-absorbing desiccant bags inside the cabin and trunk.
Cover the car with a breathable, soft-lined car cover if it’s stored indoors. Avoid plastic tarps that trap moisture.

Frequently Asked Questions

Here are answers to some common questions about tire and car storage.

Can I Use Carpet Under My Tires For Storage?

You can use clean, dry carpet remnants as a temporary barrier against concrete moisture. However, carpet compresses easily and does not provide the firm, even support of wood or plastic cradles. It is a secondary option for shorter storage periods, not the best solution for preventing flat spots.

How Long Before Tires Get Flat Spots In Storage?

The timeframe varies. On modern radial tires, you might notice temporary flat spots after just a few weeks of sitting. These usually disappear after driving a few miles. The risk of permanent deformation increases significantly after about six months of continuous, unsupported storage. Using tire supports from day one is the safest practice.

Should I Overinflate My Tires For Storage?

Yes, inflating them to the maximum pressure listed on the tire’s sidewall (often marked as “Max Press”) is recommended. This provides additional internal support and helps the tire hold its shape. Remember to adjust the pressure back to the vehicle manufacturer’s recommended level (on the door jamb sticker) before you drive the car.

Is It Better To Store A Car On Jack Stands?

Storing a car on quality jack stands is excellent for the tires and suspension, as it removes all weight. However, it requires more work and must be done correctly. Always use stands on solid, level ground and place them at the manufacturer’s specified lift points. For most people, using proper tire supports on the ground is sufficient and simpler.

What Is The Cheapest Thing To Put Under Tires For Storage?

The most cost-effective reliable material is thick plywood or wooden planks. You can often find suitable off-cuts at a lumber yard for a low cost. Avoid “free” options like cardboard, as they can lead to costly tire damage. Investing a small amount in proper supports saves money compared to replacing tires.

Common Storage Mistakes To Avoid

Even with good intentions, it’s easy to make a misstep. Here are pitfalls to watch out for.

Leaving The Parking Brake Engaged

This is a very common error. The brake pads or shoes can fuse to the rotors or drums over months, leading to a stuck brake system. Always release the parking brake and secure the vehicle with wheel chocks front and back.

Storing With A Dirty Interior

Leftover crumbs or spills will attract pests. Moisture from dirty floor mats can lead to mildew. A thorough interior cleaning is non-negotiable for long-term storage.

Neglecting The Fuel System

An empty or half-full tank invites condensation, which leads to water in the fuel and rust in the tank. Old fuel also breaks down and can clog injectors. Always use a fuel stabilizer and store with a full tank.

Forgetting About Insurance And Registration

Even in storage, your car could be damaged by fire, a falling object, or a rodent infestation. Maintain comprehensive insurance coverage. Also, check your local laws regarding registration for non-operational vehicles to avoid penalties.

Preparing your car for storage might seem like a chore, but each step has a clear purpose. Choosing the right material to place under your tires—whether wooden planks, plastic cradles, or another suitable option—is a simple task that protects a significant investment. By following a comprehensive routine, you ensure that when you’re ready to drive again, your car starts up smoothly and rolls out without any issues. Taking the time now means you can enjoy your vehicle immediately later, with no costly surprises.