The thing about spare tires is that they're often ignored right up until they're needed.

So even though you might not think about your spare all that often, it's no less important than any of your other tires. You rely on it to be there when you find yourself with a flat tire, when you experience a highway blowout, and end up stranded on the side of the road.

So why would you risk your spare by not protecting it from the elements?

In the following article, we aim to show you that your spare tire might be slowly rotting away if you’re not using a tire cover to protect it from the sun and weather.

We'll explain the protection benefits you'll get by covering your spare, the cost of tire covers, size considerations, and why spare tires are more vulnerable than your mounted tires.

Why Spare Tires Are More Vulnerable Than Regular Tires

Now, we should first mention that not all vehicles have spare tires that need to be covered.

In fact, many vehicles have spare tires hidden in the trunk or mounted under the vehicle. In those cases, your spare is already covered, or it's just impractical to try to cover it.

However, on vehicles like Jeeps, RVs, SUVs, and some pickup trucks, you’ll have a rear-mounted or bumper-mounted spare, which is indeed exposed to the elements year-round.

When that's the case, you should cover your spare tire, and here's why:

Constant Exposure to Sunlight

The biggest issue with rear-mounted spares is that they get full UV exposure. Day in, day out.

Unless your tire is protected by a high-quality all-weather tire cover, you're putting it at risk.

UV damage is the leading cause of rubber cracking.

The sun's harsh UV rays can quickly break down rubber polymers, leading to dry rot and sun damage that increase your risk of a flat tire or blowout when you drive on your spare.

Weather Damage

The same thing goes for all types of weather. When your spare tire is exposed, it comes into contact with rain, snow, ice, road salt, and dirt and debris. All of which can cause weather-related damage and increase your risk of an unusable spare.

The biggest issue, however, is that weather damage isn't always noticeable. On the surface, your spare  might look fine.

So you might not even realize how dangerous it is to use it.

But underneath the surface, your tire's rubber may be becoming dry, brittle, and more prone to cracking with every day that goes by.

Pro Tip - We actually have another blog dedicated entirely to choosing the right RV tire covers. We walk you through the best brands, what to look for, and how to make sure you buy spare tire covers that last season after season.

Should You Put a Cover on a Spare Tire?

Yes, you should keep your spare tire covered at all times, especially if it's externally mounted.

Tire covers are particularly important for RV, Jeep, SUV, and trailer owners because these vehicles often have rear-mounted spares. This is true of pretty much all vehicles with externally mounted spare tires, especially if they're parked long-term outdoors.

On the other hand, if you keep your RV or vehicle parked indoors, whether in a garage or any other type of climate-controlled storage, keeping your spare tire covered isn’t quite as important.

That said, a tire cover, even when you store your vehicle indoors, will still protect your spare from dirt, dust, and debris, which can reduce oxidation and keep your tires and rims looking their best.

Do Spare Tire Covers Actually Protect Tires?

Yes, tire covers actually do protect spare tires. The caveat, however, is that tire covers only protect spare tires if they're of good quality.

Cheap or budget-tier tire covers are usually thinner and less durable. They might look good and offer some intermediate UV protection, but they won't protect your spare tire from the elements or last as long as higher-quality covers.

Protection From UV Rays

Higher-quality covers are better at blocking sunlight. Some premium tire covers, like TIRESHIELD PRO, are even designed with a UV-resistant coating that protects the cover itself from UV radiation and reduces surface cracking.

Protection From Moisture and Dirt

Cheap covers are more likely to trap moisture and dirt. They are also more likely to be made from plastic, which is less breathable than higher-quality materials. So when moisture gets in, it stays trapped, which can hasten the deterioration of your tire.

On a similar note, quality covers keep moisture and dirt out. They’re also usually made from breathable materials that allow trapped moisture to escape, keeping your rims and sidewalls cleaner and preventing debris buildup during extended storage.

Extended Tire Lifespan

Ultimately, good quality spare tire covers are simply better at extending the lifespan of your spare. They're better at protecting your tires and rims from sunlight and weather, which maintains the rubber's flexibility and resilience over time.

Whether we’re talking about spare tires or running tires, tires and wheels are expensive. So if a spare tire cover can extend the life of your spare, even just by a few years, we say it’s well worth the cost just to protect your investment.

Types of Spare Tire Covers

One of the trickiest parts of buying spare tire covers is the sheer number of types to choose from.

Aside from price, size, and when to buy your covers (eg. Costco tire covers vs. TIRESHIELD PRO), here are a few other considerations to keep in mind.

Soft Vinyl Covers

Soft vinyl tire covers are probably the most common type you'll see. They're widely available, affordable, and offer basic UV protection and resistance to the elements. These are sometimes adequate for those who store their vehicles indoors.

However, soft vinyl covers are prone to cracking, tearing, and wearing out faster than thicker, multi-layer spare tire covers. So if you want a spare tire cover that’s going to last, you might want to look beyond soft vinyl.  

Heavy-Duty Fabric Covers

The best spare tire covers are made with multiple layers that provide excellent waterproofing, UV resistance, and breathability, all built into one.

Multi-layer protection just makes for better protection and longer-term durability, which is precisely what you should look for when investing in accessories for your car, truck, SUV, or RV.

Let's take a look at TIRESHIELD PRO, our premium tire covers, to better understand why heavy-duty multi-layer covers are often the better choice.

The TIRESHIELD PRO Difference

TIRESHIELD PRO is built for real-world spare tire protection, not just looks.

Unlike thin vinyl or cheap plastic tire covers that crack, fade, and tear after a single season, TIRESHIELD PRO features a thick, multi-layer construction that lasts. The rugged 600D Oxford polyester outer layer blocks harsh UV rays and rain, while the breathable inner layer helps seal out moisture and reduce the risk of cracking and dry rot.

On top of that, its StormLock System, which combines an adjustable strap and a heavy-duty elastic hem, keeps the cover secure through highway winds, heavy storms, and winter storage.

Most customers get years of dependable protection, even in extreme sun or snow, which is something you just don't get with cheap, thin covers.

Hard Shell Covers

Hard shell covers are another common variation you'll see, particularly on SUVs and Jeeps. These are truly among the most durable tire covers. But they're also the most expensive and least versatile.

Sure, they look great and truly do a great job of protecting your spare. But they're big and bulky, and they're not easy to store when you're not using them. So they’re practical if you keep the cover on your tire or for when you’re near your home base.

But when you’re traveling long distance or living in your RV, hard shell covers just aren’t a practical choice.

RV Spare Tire Covers: What Makes Them Different?

There's not really all that much difference between RV spare tire covers and regular car or truck spare tire covers. The biggest difference is that RV spare covers are generally designed for large-diameter tires.

RV spare tire covers, like TIRESHIELD PRO, also often include thicker UV-resistant materials.

Because most RV spare tires are rear-mounted, they get a lot of sunlight and exposure to wind, rain, ice, and snow. They also experience a lot of wind while you're tearing down the highway, which is why RV spare wheel covers usually have built-in straps or elastic hems that help keep them in place and prevent flapping.

Therefore, RV spare wheel covers are usually designed specifically for constant outdoor exposure, not just intermediate use.

Pro Tip - New to RVing? We've got a dedicated blog post section on RV life, including posts on winterizing your RV, pre-departure and maintenance checklists, what to know as a new RV owner, and more.

How Much Does a Spare Tire Cover Cost?

Like all essential car accessories, spare tire covers range from basic, budget-friendly to premium, high-end covers that cost a bit more.

Budget Range - $5-$20

Basic vinyl covers fit into the lowest price tier. You'll find these available on marketplaces like TEMU or Amazon. Budget-range tire covers are OK if you store your vehicle indoors or just want a cover to protect your spare from dust and dirt.

But because these often have a universal-fit design, they're not ideal for protecting against long-term sun exposure or for rear-mounted spares that experience a lot of wind.

Mid-Range Covers - $20-$40

Mid-range spare covers generally cost between $20 and $40 for a set. These typically feature thicker materials, better stitching, and greater UV resistance.

But you get what you pay for. Mid-range covers provide better protection and durability than budget covers.  But they still won't perform as well or last as long as if you order high-end, premium covers.

Premium Covers - $40-$100

It’s true that premium covers cost more than budget and mid-range models. But they’re usually available in multiple sizes, so you can choose one that fits your specific tire.

They're also generally better designed, with multi-layer fabrics and reinforced seams that provide better performance and long-term durability.

Is It Worth Spending More?

Generally, yes, it's worth spending a bit more to get a spare tire cover that will last. But the answer really depends on how you'll use your cover and the level of protection you want.

When you compare the cost of a good quality tire cover, especially the cost of RV tires, to the cost of replacing your spare tire due to dry rot and sun damage or the cost of frequently replacing your cheap tire covers that crack, tear, and wear out, it becomes clear that buying good quality covers is worth it.

When you spend more, you won't need to replace your covers as often.

Plus, you'll get better protection against UV radiation and weather damage, which can extend the lifespan of your spare.

In the end, good tire protection is an inexpensive form of insurance. It keeps you safer while on the road and keeps more of your money in your pocket in the long-term.

What Size Spare Tire Cover to Get

Spare wheel covers come in all sorts of different sizes and configurations.

Some covers are designed to fit snugly over your spare, which means you need to buy one for the exact size of your tire, whereas others have handy straps or windproof systems that let you adjust the size and provide a perfect fit for any tire.

We actually have another dedicated guide on measuring your tires for wheel covers. You can read it here: How To Measure for RV Tire Covers. But here's a quick rundown on how to convert your tire size into diameter and why a proper fit matters.

Find Your Tire Code & Convert

First, look up your spare tire's code on the sidewall. This code usually looks something like this: "205/70R15."

Once you've got the code, convert it to find the diameter of your tire and the size of tire cover you’ll need.

In the example format shown above, the first number (205) is the tire's full diameter in millimeters.

Once you've found that, use our TIRESHIELD PRO Size Calculator to determine the size you'll need. Or you can convert your spare tire's diameter to inches and use that number when shopping for covers.

Why Proper Fit Matters For Spare Tire Covers

Properly fitting spare tire covers matter more than most people realize.

A cover that’s too loose can flap around and shift in the wind, allowing sunlight to sneak in and defeating its purpose of protecting your tire and reducing UV damage.

On the other hand, a cover that’s too tight puts constant stress on the seams and fabric, leading to premature tearing.

Ultimately, the right spare tire cover fit keeps the cover secure, prevents flapping at highway speeds, and reduces wind damage.

Pro Tip - Click here to use our helpful TIRESHIELD Size Calculator. Start by entering your tire code into the calculator (e.g., 225/70R16), and it'll instantly provide the proper size of TIRESHIELD PRO to match your spare tire.

How to Properly Install TIRESHIELD PRO Spare Tire Cover

Some spare covers might differ slightly in features. But here's a quick look at how to properly install TIRESHIELD PRO on your spare wheel.

1. Clean and dry the tire - Remove dirt, road grime, and debris so moisture doesn’t get trapped beneath the cover. Always install spare tire covers on a fully dry tire.

2. Position the cover evenly - Starting at the top, slide your cover over the tire, making sure the multi-layer material is centered and fully seated around the sidewalls.

3. Seat the cover firmly. If needed, adjust it so the inner breathable layer sits flush against the tire, ensuring full UV and moisture protection.

4. Use the StormLock-System™ to secure it - Tighten the adjustable strap and ensure the heavy-duty elastic hem is locked in place for a secure hold.

5. Perform a final snug-fit check. Confirm the cover is tight enough to prevent flapping in highway winds, storms, or during long-term storage.

How Long Do Spare Tire Covers Last?

Tire cover life depends on the quality of the covers you buy, the amount of use they get, and how they're stored.

So, for example, if you purchase cheap, budget models and use them frequently (on and off during travel), they may only last a season or two. Whereas, if you purchase good-quality tire covers, they'll likely last much longer, even if they're used often.

Mid-range tire covers tend to be slightly more durable than budget models. But they still won’t last as long as premium covers, which feature UV-resistant coatings or reinforced seams and stitching.

Ultimately, there's a handful of factors that affect longevity, including climate, sun exposure, material quality and thickness, and wind exposure.

But no matter what, when you order better quality tire covers, you'll get better performance, durability, and protection for your tires.

Common Mistakes to Avoid When Buying Tire Covers - Size, Materials, Backup Cameras and Camera Holes

Purchasing the wrong size tire covers is probably the biggest mistake people make.

Covers that are too big sag and flap in the wind, rubbing against the tire and causing premature wear. Meanwhile, covers that are too small are harder to install and will likely be stretched too tight, putting the seams under constant tension.

Either way, improperly sized covers lead to faster than usual wear and tear, as well as covers that can shift and expose your tire to the elements.

Here's a quick look at a few other of the most common mistakes people make when shopping around for tire covers.

• Using tarps or other materials as tire covers - Tarps don't last when they flap around in the wind and other types of materials just aren't designed to be used a tire covers.

• Choosing thin material for RV use - Thin covers are more likely to crack and tear. They may also not protect your tires as well as you'd like.

• Ignoring wind security - When covers don't fit properly, they flap and shift in the wind. Some people use bungee cords or straps to prevent this. But that just looks bad.

• Not accounting for your backup camera - Many modern vehicles have camera holes at the back of the vehicle. Just make sure to account for backup cameras and placement when shopping for covers.

Final Verdict - Are Spare Tire Covers Just Cosmetic?

No, spare tire covers are absolutely not just cosmetic.

You can purchase decorative or custom spare tire covers to protect your spare from the sun and other elements.

Just make sure to look for covers that provide adequate protection from the sun, are made with premium materials, and are thick enough to last season after season.

Ultimately, there’s nothing wrong with decorative spare covers.

But we encourage you to choose protection over appearance. Decorative spare tire covers can be worth a laugh sometimes. But if they're cheaply made, they just won't provide you with the protection and durability you deserve.

Pro Tip - Don't want to buy four tire covers just to protect one spare tire? TIRESHIELD PRO is now available in a convenient 2-pack. Unfortunately, you can't buy just a single TIRESHIELD PRO cover. But you can get one for your spare, and a second cover that you can use as a gift for a friend or family member too!

FAQ Section - Spare Tire Covers For Jeep Wrangler, RVs, And Other Vehicles With Rear-Mounted Spares

Here are a handful of frequently asked questions we hear from our readers about whether or not you should keep your spare tires covered and protected from the elements.

Should you put a cover on a spare tire?

Yes, if you have a rear-mounted spare tire or if your spare is otherwise exposed to the sun, it should be covered. When tires are left exposed, they dry out and lose flexibility more quickly, leading to faster tire wear and a higher risk of blowouts and flats.

Do spare tire covers protect against dry rot?

Yes, spare tire covers help to protect against dry rot and sun damage, and can extend the life of your spare tires.

How much does a spare tire cover cost?

It depends on the type, size, and brand of spare tire cover you purchase. A single small set of TIRESHIELD PRO tire covers can be purchased for our shop for $53.54. You can also purchase 2 sets for the discounted price of $44.09 per set.

What size spare tire cover should I get?

It depends on the size of your spare tire. You can use our helpful TIRESHIELD PRO size calculator to ensure you get the right cover for your ride.

Are RV spare tire covers different from regular ones?

Some are. But the difference between an RV spare tire cover and a regular tire is primarily size. RVs generally have larger tires, so you may need to purchase a larger set of spare tire covers.

How long do spare tire covers last?

Tire covers can last anywhere from a few years to a decade. It really depends on the product's design, material, and usage. Cheaper, thin tire covers only last a few seasons before they crack and wear out. On the other hand, high-quality tire covers are made with premium UV-resistant materials that last longer.

Do spare tire covers trap moisture?

They can. If you purchase cheap spare tire covers, they can actually trap moisture, which can accelerate tire wear and dry rot. That's why we encourage drivers to look for spare tire covers made from high-quality breathable materials.