what to put under tires when storing car

[VonGarrett]

The best thing to put under your tires when storing a car is a set of purpose-built flat-free tire cradles or parking pads. These are designed to support the tire's rounded shape and distribute weight evenly, which is the most effective method for preventing flat spots. Alternatively, you can inflate your tires to the maximum pressure recommended on the sidewall and park the car on a set of thick plywood sheets. The key is to lift the tire slightly off the ground or provide a firm, supportive surface to combat the permanent deformation that can occur from sitting in one spot for months.

Flat spots happen when the tire's rubber compound loses flexibility and the weight of the vehicle causes a flat section to form where the tire contacts the ground. While modern radial tires are more resistant than old bias-ply tires, long-term storage (over a month) still poses a risk, especially in fluctuating temperatures.

Professional-Grade Solutions:

• Flat-Free Tire Cradles: These are the gold standard. They are made from high-density polyethylene and contour to the tire's shape, cradling it to prevent flattening. They are lightweight, durable, and highly effective.
• Car Ramps/Storage Ramps: These plastic ramps allow you to drive the car up, lifting all four tires completely off the ground. This is the most thorough solution but requires more effort and space.

Effective DIY Alternatives:

• Plywood Sheets: Use at least 3/4-inch thick plywood cut into squares large enough to fully support each tire's footprint. This provides a firm, flat surface that's better than soft asphalt or concrete.
• Carpet Squares (Plush Side Down): While not as ideal as plywood, thick, dense carpet squares can work for shorter storage periods by providing a slightly cushioned, uniform surface.

Critical Complementary Steps: Simply placing something under the tires isn't enough. For storage over 30 days, you must also inflate your tires to their maximum cold pressure as listed on the sidewall (often 5-10 PSI above normal). This increases the internal rigidity of the tire, making it much more resistant to deforming. Moving the car forward or backward just a few inches every month can also help redistribute the stress points.

Storage Factor	Recommended Action	Why It Matters
Primary Surface	Flat-Free Tire Cradles	Provides optimal shaped support to prevent deformation.
Tire Pressure	Inflate to max sidewall pressure (e.g., 50-51 PSI)	Increases tire rigidity, combating flattening force.
Storage Duration	Critical for storage over 30 days	Risk of permanent flat spots increases significantly with time.
Surface Type	Avoid direct contact with dirt, grass, or soft asphalt	Moisture accelerates rubber degradation and promotes dry rot.
Ideal Environment	Cool, dry, and out of direct sunlight	UV rays and heat are major contributors to tire dry rot.
Secondary Method	Move vehicle 6 inches every 4-6 weeks	Shifts the tire's contact patch to prevent settling.

[MacMarcus]

Plywood squares. Just cut four pieces about a foot and a half square from some 3/4-inch thick plywood. It’s cheap, it’s solid, and it keeps the tires from sinking into the garage floor over the winter. It’s what I’ve used for my truck for years. Before you park it, pump up those tires to the max pressure on the sidewall, too. That combo does the trick for me without spending a fortune on fancy gadgets.

[SanVera]

For my classic car, I insist on dedicated tire cradles. Flat spots on bias-ply tires are a real nightmare and can ruin the ride. The cradles are shaped perfectly to hold the tire's form. I combine this with over-inflating the tires and ensuring the car is stored in a climate-controlled space. It’s a small investment to protect the integrity and value of the vehicle. The peace of mind is worth every penny.

[StSabrina]

The most important thing is to get the weight off the tires entirely. I use a good set of jack stands placed securely under the car's frame. Then, the tires are bearing zero load, which is the only guaranteed way to prevent flat spots. If you don't have stands, then those plastic storage ramps you drive onto are the next best thing. Placing something under the tires is a half-measure; lifting the car is the complete solution.

[LeLincoln]

Beyond just putting something underneath, think about the whole picture. Yes, tire cradles or thick wood planks are great. But you also need to inflate the tires to their maximum recommended pressure—this is non-negotiable. Try to store the car in a cool, dark place away from sunlight, which can dry out the rubber. If it’s going to be stored for many months, consider rolling the car a foot or two every once in a while to change the contact point. It’s a system, not just one trick.