There are different types of spare tires. A full-size spare provides versatility but needs more storage space. A temporary spare is lightweight, has shallower tread depth, and is easy to install. Both types can use inflation devices for effective tire repair, making them practical options for drivers.
The compact spare tire, often called a “donut,” is smaller and lighter. It saves space and weighs less, making it easier to handle. However, compact spares are not designed for long distances. They typically have speed and distance limits.
The run-flat tire allows drivers to continue driving after a puncture. This feature provides added safety by preventing sudden loss of air pressure. However, run-flat tires can be more expensive and may have a stiffer ride.
Selecting the right type of spare tire is crucial for your driving habits and vehicle type. Understanding these options will help you make an informed decision.
Transitioning into the next section, we will discuss the essential criteria for choosing the right spare tire. Factors like size, compatibility, and driving conditions play a vital role in this decision-making process.
What Are the Different Types of Spare Tires Available?
The different types of spare tires available include temporary, full-size, and run-flat tires.
- Temporary spare tires (also known as donut spares)
- Full-size spare tires
- Run-flat tires
- Tire repair kits
Temporary spare tires are compact and lighter. They are designed for short distances and lower speeds. Full-size spare tires match the original tires and can be used long-term. Run-flat tires allow driving on flat tires for a limited range, providing convenience. Tire repair kits offer an alternative without needing a spare but may not work for all damages.
1. Temporary Spare Tires:
Temporary spare tires, or donut spares, provide a compact, lightweight option for emergency use. Their smaller size allows for easy storage in the vehicle. However, they are typically rated for lower speeds and shorter distances, often around 50 miles at a maximum speed of 50 mph. This limits their effectiveness for long-distance travel. According to Consumer Reports, temporary spares are common in many vehicles because they save space while still offering a solution for flat tires.
2. Full-Size Spare Tires:
Full-size spare tires are identical to the vehicle’s regular tires. This type offers the benefit of matching dimensions and performance characteristics of the standard tires. Users can drive on full-size spares without speed or distance restrictions. However, they require more storage space in the vehicle. Owners of SUVs and off-road vehicles often prefer full-size spares, as they provide reliable performance. A study by Tire Rack shows that full-size spares are favored for their versatility and long-term usability.
3. Run-Flat Tires:
Run-flat tires allow the driver to continue traveling even after experiencing a puncture. They feature reinforced sidewalls that support the vehicle’s weight when air pressure is lost. This option enhances safety by preventing complete tire failure. Run-flat tires typically allow for limited distance travel (approximately 50 miles) at reduced speeds (up to 50 mph). Many luxury vehicles and some high-performance cars come equipped with run-flat tires. Research indicates that run-flat technology reduces the inconvenience of changing a tire by enabling the vehicle to be driven to safety.
4. Tire Repair Kits:
Tire repair kits offer a practical alternative to spare tires by providing tools to fix minor tire damages. These kits usually include sealant and an inflator but are not suitable for major tears or sidewall damage. Some automakers now equip their vehicles with these kits instead of spare tires to save weight and space. The Automotive Aftermarket Industry Association reports that tire repair kits can be effective for addressing up to 90% of tire-related issues quickly. However, they do not eliminate the need for a spare or additional assistance for serious problems.
How Does a Full-Size Spare Tire Compare to Other Types?
A full-size spare tire compares favorably to other types of spare tires in several key areas. It is the same size and type as the tires normally used on the vehicle. This similarity allows for optimal performance and handling, just like the regular tires. A full-size spare typically provides better safety and stability than a temporary spare or “donut” tire, which is smaller and can only be driven at reduced speeds.
In contrast, a temporary spare is lightweight and takes up less space. However, it is not designed for long-distance driving. A run-flat tire offers convenience since it can operate even when deflated. However, it may have limited tread life and requires immediate replacement when damaged.
Ultimately, full-size spare tires offer greater versatility, safety, and compatibility with your vehicle’s specifications. Choosing a full-size spare enhances peace of mind during emergencies. It ensures that you can continue your journey with confidence.
What Are the Key Features of a Compact Spare Tire?
The key features of a compact spare tire include its lightweight design, smaller size, limited tread pattern, and reduced speed rating. These characteristics make it suitable for temporary use.
- Lightweight design
- Smaller size
- Limited tread pattern
- Reduced speed rating
- Temporary use only
The compact spare tire has several distinctive attributes that affect its performance and utility. Understanding these features can help users make informed decisions regarding their use.
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Lightweight Design:
The lightweight design of a compact spare tire makes it easier to handle, install, and store. Compact spares typically weigh less than full-size tires, which contributes to overall vehicle weight reduction. This can be advantageous in emergency situations when quick changes are necessary. -
Smaller Size:
The smaller size of a compact spare tire allows for easier storage in vehicles with limited space. Typically, these tires are designed to fit small wheel wells and can be tucked away more efficiently than larger tires. This space-saving feature is particularly useful for smaller cars or those with minimal storage options. -
Limited Tread Pattern:
The limited tread pattern of a compact spare tire is engineered for temporary use. These tires often feature a smoother surface that is optimized for straight-line driving. The tread design may not provide the same level of traction as full-size tires, which can be a downside for users who encounter diverse road conditions. -
Reduced Speed Rating:
Compact spare tires have a reduced speed rating, usually around 50 mph. This limitation indicates that they are not meant for prolonged highway use. Drivers must be aware of this speed restriction to ensure their safety and avoid tire damage. -
Temporary Use Only:
Compact spare tires are intended for short-term use only. They are designed to help drivers reach a nearby service station or a safe location for a proper tire replacement. Prolonged use of these tires can lead to safety hazards due to their design limitations.
In summary, the key features of a compact spare tire make them a useful but temporary solution for tire issues. Users should understand their limitations to ensure safety on the road.
When Should You Use a Donut Spare Tire?
You should use a donut spare tire when you experience a flat or damaged tire that prevents your vehicle from functioning properly. Donut spare tires are smaller and designed for temporary use. They typically have a reduced speed limit, usually around 50 miles per hour, and a limited driving distance, generally up to 70 miles.
When a tire goes flat, first assess the damage. If it is severe and repairs are not possible, then using a donut spare tire becomes necessary. Next, remove the damaged tire and install the donut spare firmly. This process typically involves loosening lug nuts, replacing the tire, and tightening the lug nuts again. You should drive carefully and avoid high speeds until the damaged tire is replaced with a full-sized tire.
In summary, use a donut spare tire in emergencies when a tire becomes unusable, and follow the safety guidelines related to speed and distance.
What Benefits Do Run-Flat Tires Offer?
Run-flat tires offer several advantages for drivers who prioritize safety and convenience after a tire puncture.
- Enhanced safety by allowing continued driving after a puncture.
- Increased convenience by eliminating the need for immediate roadside tire changes.
- Improved performance under certain driving conditions.
- Space-saving benefits due to the absence of a spare tire.
- Possibility of lower insurance premiums depending on coverage.
The benefits of run-flat tires can significantly influence a driver’s decision-making process regarding tire options.
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Enhanced Safety:
Enhanced safety is a primary benefit of run-flat tires. These tires are designed to support the vehicle’s weight, even when they lose pressure. This allows drivers to maintain control and steer the vehicle to a safe location after a puncture. According to Tire Review, run-flat tires can typically be driven for up to 50 miles at speeds of 50 miles per hour on a flat. This capability reduces accident risk during tire failure. -
Increased Convenience:
Increased convenience is another advantage of run-flat tires. Drivers do not need to change a tire immediately after a flat. This is particularly useful in unfavorable weather conditions or unsafe areas. A study by the National Highway Traffic Safety Administration indicates that run-flat tires can lead to fewer roadside assistance calls, contributing to enhanced driver peace of mind. -
Improved Performance:
Improved performance is often discussed among enthusiasts of high-performance vehicles. Run-flat tires tend to have stiffer sidewalls, which can enhance vehicle handling and stability in specific conditions. According to research by the Tire and Rubber Association, run-flat tires may provide better cornering capabilities. However, the stiffer construction can also lead to a harsher ride. -
Space-Saving Benefits:
Space-saving benefits are significant for vehicles with limited storage. Without a spare tire, drivers can utilize that space for additional luggage or equipment. Furthermore, many manufacturers design vehicles specifically to accommodate run-flat tires, optimizing weight distribution and overall design efficiency. -
Possibility of Lower Insurance Premiums:
The possibility of lower insurance premiums is a perspective worth noting. Some insurers offer discounts for vehicles equipped with run-flat tires due to their safety features. According to a report by the Insurance Information Institute, these discounts vary by provider but can provide an additional incentive for choosing run-flat tires. However, the effectiveness of this benefit can depend on individual insurance policies.
Thus, while run-flat tires offer numerous advantages, it’s essential to weigh them against potential drawbacks, such as a higher initial cost and potentially limited tire choices.
How Effective Are Tire Repair Kits as an Alternative?
Tire repair kits are effective as an alternative to traditional spare tires in certain situations. Firstly, they typically include sealant and air compressors to fix small punctures. These kits work quickly and require minimal tools, making them convenient for roadside repairs. However, they may not address larger damage or sidewall punctures. Secondly, using a tire repair kit can help drivers reach the nearest service station. They allow for temporary repairs, stabilizing the tire until a professional can fix it. Lastly, the effectiveness of these kits varies based on tire type and damage severity. Overall, tire repair kits provide a practical solution for minor issues but should not replace spare tires for significant repairs or long-term use.
What Are the Advantages and Disadvantages of Each Spare Tire Type?
The advantages and disadvantages of each spare tire type include key differences in functionality, durability, and purpose. Here are the main types of spare tires along with their pros and cons:
- Full-size spare tire
- Compact spare tire (also known as “donut”)
- Run-flat tire
The choice of spare tire type can affect convenience, safety, and vehicle performance. Each type has distinctive features that may be more suitable for different driving needs and situations.
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Full-size Spare Tire:
Full-size spare tires offer identical dimensions and capabilities as the vehicle’s regular tires. They provide the same handling characteristics and allow for higher speeds on the road. This type can be used for long distances without restrictions. However, full-size spares are heavier and require more storage space in the vehicle. -
Compact Spare Tire:
Compact spare tires, or donuts, are smaller and lighter than full-size tires. They save trunk space and reduce vehicle weight. However, they have limitations in terms of speed and distance, typically limited to 50 miles per hour and around 70 miles of driving distance. This tire type may also affect vehicle handling since it is narrower and designed for temporary use. -
Run-flat Tire:
Run-flat tires maintain their shape even when deflated, allowing drivers to continue driving for a short distance (usually up to 50 miles) at reduced speeds. They provide the convenience of not needing to change a tire immediately. However, run-flats are generally more expensive, offer a harsher ride, and may have limited tread life.
Choosing the right spare tire depends on individual driving habits, preferences, and needs. Evaluating each tire’s advantages and disadvantages helps drivers make informed decisions while considering factors such as storage space, driving range, and safety.
What Are the Benefits of Using a Full-Size Spare Tire?
Using a full-size spare tire offers several advantages over compact or temporary spare options. These benefits include better handling, improved safety, immediate usability, and extended driving range.
- Better Handling
- Improved Safety
- Immediate Usability
- Extended Driving Range
To understand these benefits better, let’s explore each point in detail.
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Better Handling:
Better handling refers to the enhanced performance and stability of a vehicle when a full-size spare tire is in use. A full-size spare tire matches the specifications of the vehicle’s other tires. This consistency ensures that the vehicle maintains better grip, balance, and responsiveness while driving, especially during turns or adverse conditions. According to a study by Tire Industry Association in 2021, vehicles equipped with matching tires experience a 20% improvement in handling compared to those with mismatched or temporary tires. -
Improved Safety:
Improved safety is a crucial advantage of using a full-size spare tire. Full-size tires provide the same traction and braking capabilities as the original tires, reducing the risk of accidents. The National Highway Traffic Safety Administration (NHTSA) reports that incorrectly inflated or mismatched tires contribute to 30% of tire-related crashes. By having a full-size spare, drivers ensure their vehicles’ performance and responsiveness remain consistent in emergency situations. -
Immediate Usability:
Immediate usability allows drivers to replace a flat tire quickly without the need for adjustments or special tools. A full-size spare tire can be fitted onto the vehicle directly, minimizing the time spent on roadside repairs. This feature is essential for drivers in remote areas where help may be far away. According to AAA, around 28 million drivers face vehicle breakdowns each year, highlighting the importance of quick tire replacement. -
Extended Driving Range:
Extended driving range means that drivers can continue to use a full-size spare tire for more extended periods compared to compact spares, which are typically limited to short distances. A full-size spare can support driving at regular speeds and distances, offering flexibility to reach a nearby repair shop without hassle. For example, a compact spare may be limited to 50 miles and 50 mph, while a full-size tire can travel hundreds of miles at normal highway speeds.
In conclusion, using a full-size spare tire significantly enhances handling, safety, usability, and driving range, making it a practical choice for vehicle owners.
What Limitations Should You Be Aware of with Compact Spare Tires?
Compact spare tires have several limitations that drivers should know before relying on them for long-distance travel.
- Limited speed: Compact spare tires are usually rated for a maximum speed of 50 mph.
- Reduced handling: The smaller size can affect vehicle handling and stability.
- Shorter lifespan: They are designed for temporary use and wear out faster than regular tires.
- Smaller tread surface: This leads to less traction, especially in adverse weather conditions.
- Limited tire pressure: They often require higher inflation pressure than standard tires.
- Not suitable for all vehicles: Some cars may not accommodate compact spares due to size or vehicle design.
- Geographic limitations: Not all tire shops carry compact spares or may not provide replacements.
Considering these points, understanding the drawbacks of compact spare tires is essential for making informed decisions about vehicle maintenance and safety.
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Limited Speed:
Limited speed refers to the maximum velocity at which compact spare tires can safely operate. These tires typically have a speed rating that limits them to 50 mph. Exceeding this speed can lead to tire failure, reduced control, and increased risk of accidents. For example, the National Highway Traffic Safety Administration (NHTSA) advises that drivers adhere to this limit to maintain safety while driving on these temporary tires. -
Reduced Handling:
Reduced handling concerns how compact spare tires can affect a vehicle’s maneuverability. The smaller diameter of these tires can alter the car’s center of gravity. As a result, drivers may notice less precise steering responses. According to Tire Rack, a firm specializing in tire testing, this can be particularly problematic in emergency situations where quick handling is essential. -
Shorter Lifespan:
Shorter lifespan indicates that compact spare tires are not meant for extended use. Typically, these tires are designed for temporary situations, limiting their mileage to around 70 miles in ideal conditions. This means drivers should replace them with full-sized tires as soon as possible. A study by Consumer Reports emphasizes the importance of this point, noting that relying on a compact spare beyond its intended use can be dangerous. -
Smaller Tread Surface:
A smaller tread surface means compact spare tires often have less contact area with the road. This results in reduced traction across all terrains, particularly in wet or snowy weather. The Tire Industry Association explains that this can increase the likelihood of hydroplaning and sliding, raising safety concerns during challenging driving conditions. -
Limited Tire Pressure:
Limited tire pressure pertains to the need for higher air pressure in compact spare tires. These tires usually require inflation to 60 psi or more, compared to regular tires that average around 30-35 psi. The exact pressure specifications can vary based on the vehicle’s requirements. Correct pressure is crucial for optimal performance and minimizing the risk of tire blowouts due to improper inflation. -
Not Suitable for All Vehicles:
Not suitable for all vehicles indicates that some cars may not accommodate compact spare tires effectively. For example, vehicles with larger brakes or suspension setups may not have the necessary clearance for a compact spare. The manufacturer’s specifications provide guidance on whether a vehicle can use a compact spare. Failure to follow these guidelines can lead to safety issues and vehicle damage. -
Geographic Limitations:
Geographic limitations refer to issues related to availability and accessibility of suitable replacements. Some areas may lack tire shops that stock compact spare tires. As noted by the American Automobile Association (AAA), this can leave drivers stranded or facing challenges in securing replacements when needed. It’s important for drivers to understand their local resources before relying solely on a compact spare.
Why Might a Donut Spare Tire Be a Less Valuable Option?
A donut spare tire may be a less valuable option due to its limited functionality and design limitations. These compact spare tires, often referred to as “donuts,” are designed for temporary use and have restrictions on speed and distance.
According to the Tire and Rim Association, a nonprofit organization dedicated to standards for tires and wheels, a donut spare tire is a smaller, lightweight tire meant solely for emergency situations. It usually has a narrower width and a different tread pattern compared to standard tires, which affects its performance.
The drawbacks of donut spare tires stem from several key reasons:
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Limited Durability: Donut tires are not built for long-term use. They typically last for about 50 to 70 miles and should not exceed speeds of 50 mph. This makes them unsuitable for extended travel.
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Reduced Traction: The design of donut tires often creates less grip on the road. This can lead to compromised safety, especially in adverse weather conditions like rain or snow.
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Compatibility Issues: Donut tires may not fit all vehicles. Their unique size requires drivers to check compatibility and could necessitate purchasing a full-size spare if a donut cannot be used.
The limitations of donut spare tires arise from their construction. They are made of thinner materials compared to full-size spare tires. This makes them lighter but also less robust. Their tire pressure is typically higher, affecting their ride quality and stability on the road.
Specific conditions that amplify the shortcomings of donut tires include:
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Rough Terrain: Driving on unpaved roads can increase the risk of damage to a donut spare, as it can lack the toughness to withstand such conditions.
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Emergency Situations: In stressful situations, like a sudden tire blowout, drivers may not have the luxury of time to locate a full-size spare. Relying on a donut in these cases can lead to further complications if the journey exceeds its limits.
In summary, a donut spare tire may be less valuable due to its short lifespan, lower performance capabilities, compatibility issues, and the restrictions it imposes on driving conditions.
How Can You Choose the Right Spare Tire for Your Vehicle?
To choose the right spare tire for your vehicle, consider factors such as size, type, and compatibility with your vehicle’s specifications.
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Size: The spare tire must match the size specified for your vehicle. Check the existing tires or the owner’s manual to find the correct tire size. Using a tire that is too large or too small can affect the vehicle’s handling and safety. For example, a standard tire size could be 205/55R16, which indicates width, aspect ratio, and diameter.
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Type: There are different types of spare tires available, mainly full-size spares, temporary (or donut) spares, and run-flat tires. Full-size spares take up more space and are the same size as regular tires. Temporary spares are lighter but have speed and distance limitations. Run-flat tires allow you to drive for a short distance even after a puncture, providing more convenience but may require specific wheel types, as noted by Tire Review (2020).
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Compatibility: Confirm that the spare tire is compatible with your vehicle’s make and model. Different vehicles have varying requirements for bolt patterns, tire pressure monitoring systems, and load ratings. Refer to your owner’s manual or consult with a tire professional to ensure you select the correct option.
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Load rating: Ensure that the spare tire has an adequate load rating. The load rating indicates how much weight the tire can safely carry. Using a tire that cannot support the vehicle’s weight can lead to tire failure. National Highway Traffic Safety Administration (NHTSA) guidelines suggest matching or exceeding the original tire’s load capacity.
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Tread pattern: Consider the tread pattern of the spare tire. An adequate tread pattern provides better traction depending on your driving conditions. Some patterns are designed for off-road capabilities, while others focus on highway performance. Do note that a mismatched tread may affect the vehicle’s handling.
By paying attention to these factors, you can confidently select a spare tire that meets your vehicle’s needs and maintains safety on the road.
What Factors Should Influence Your Spare Tire Choice?
When choosing a spare tire, consider factors such as compatibility, type of tire, usage frequency, cost, and storage options.
- Compatibility with Vehicle
- Type of Spare Tire (Full-Size, Temporary, or Run-Flat)
- Intended Use (On-Road vs. Off-Road)
- Storage Space in Car
- Budget Considerations
Selecting the right spare tire involves understanding these factors and how they relate to your specific needs and circumstances.
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Compatibility with Vehicle: Compatibility with your vehicle is crucial when selecting a spare tire. A spare must meet your vehicle’s specifications to ensure proper fit and function. Using the owner’s manual or checking tire specifications can provide necessary details. Misalignment can lead to safety hazards and performance issues, emphasizing the importance of this factor.
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Type of Spare Tire (Full-Size, Temporary, or Run-Flat): The type of spare tire influences its performance and usability. A full-size spare matches the vehicle’s regular tires, offering the same performance but can take up significant space. Temporary spare tires, often referred to as “donuts,” are lighter and more compact but have speed and distance limitations. Run-flat tires allow you to drive even after puncturing, providing a measure of convenience but usually at a higher cost.
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Intended Use (On-Road vs. Off-Road): Your intended use for the spare tire is a critical consideration. On-road tires are designed for smooth, paved surfaces, while off-road tires provide traction and durability on rough terrain. Choosing the right tire type for your typical driving conditions is vital to maintaining vehicle performance and safety.
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Storage Space in Car: The amount of storage space available in your vehicle influences your spare tire choice. Some vehicles have dedicated compartments for full-size spares, while others may require a compact spare. Understanding available storage helps simplify the selection process and ensures ease of access in emergencies.
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Budget Considerations: Budget is another important factor when selecting a spare tire. Prices can vary significantly based on tire type and brand. While it may be tempting to choose the cheapest option, investing in a reliable tire can prevent additional expenses in the future due to poor performance. Assessing the warranty and durability of each option can also guide decision-making regarding long-term costs.
How Do Driving Habits Affect Spare Tire Selection?
Driving habits significantly affect spare tire selection by influencing factors such as the type of tire needed, the expected performance conditions, and the frequency of use.
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Type of Tire: Different driving habits necessitate different spare tire types. For instance, off-road driving may require a more robust tire, while city driving can accommodate a standard temporary tire. A study by the Tire Industry Association (2020) indicates that drivers engaged in off-road activities are 30% more likely to encounter tire punctures than those driving primarily on paved roads.
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Performance Conditions: Spare tires must match the conditions under which they will be used. Regular drivers may opt for all-season or touring tires, whereas those who frequently drive in winter may need a winter tire option for better traction in snow and ice. Research from the National Highway Traffic Safety Administration (NHTSA, 2021) shows that winter tires improve traction by up to 30% in cold conditions compared to all-season tires.
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Frequency of Use: Drivers who travel long distances or in remote areas should select a full-size spare for reliability. In contrast, urban drivers with less risk of tire failure might choose a compact spare. A survey by the American Automobile Association (AAA, 2019) found that 40% of drivers reported experiencing a flat tire at least once in their lifetime, highlighting the importance of spare tire selection based on usage frequency.
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Tire Maintenance: Driving habits also influence how often tires are maintained or checked. Drivers who regularly inspect their tires ensure their spare is in optimal condition. According to the Rubber Manufacturers Association (2022), regular tire maintenance can extend the lifespan of a spare tire by 20%.
Understanding the impact of driving habits on spare tire selection helps ensure safety and efficiency on the road.
What Are Best Practices for Storing and Using Your Spare Tire?
To effectively store and use your spare tire, follow specific best practices. Proper care can enhance its performance when needed.
- Check the Tire Pressure Regularly
- Store the Spare Tire in a Cool, Dark Place
- Inspect for Damage or Wear
- Rotate the Spare Tire Periodically
- Follow Manufacturer Recommendations
- Know When to Replace the Spare Tire
Understanding how to store and use your spare tire efficiently ensures safety and reliability. Here are detailed explanations of each best practice.
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Check the Tire Pressure Regularly: Checking the tire pressure of your spare tire in active situations is crucial for its proper performance. A fully inflated spare tire increases the likelihood of a smooth drive after a flat tire. The recommended tire pressure is often found on a sticker inside the driver’s side door or in the owner’s manual. According to the National Highway Traffic Safety Administration (NHTSA), under-inflated tires can lead to unsafe handling and reduced fuel efficiency.
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Store the Spare Tire in a Cool, Dark Place: Storing your spare tire in a cool, dark area prevents exposure to harmful UV rays and extreme temperatures. High heat and sunlight can deteriorate the rubber over time. The Tire Industry Association suggests keeping the spare tire indoors when possible, especially in regions with extreme weather conditions.
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Inspect for Damage or Wear: Regularly inspecting your spare tire for any signs of damage or wear is vital. Look for cracks, bulges, or punctures that could affect its integrity. The U.S. Tire Manufacturers Association recommends checking the spare at least every six months, ensuring it is road-worthy when needed unexpectedly.
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Rotate the Spare Tire Periodically: Periodically rotating your spare tire ensures even wear and extends its lifespan. This practice can help you assess its condition better, and the spare may even be used as part of a regular rotation schedule with your other tires. Automotive experts suggest performing this rotation during regular vehicle maintenance or oil changes.
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Follow Manufacturer Recommendations: Always adhere to the tire manufacturer’s recommendations regarding storage and usage. This information is typically found in the vehicle’s owner’s manual. Manufacturers provide specific guidelines for spare tire care, which can impact performance and safety. Failure to comply may lead to voiding warranties or safety risks.
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Know When to Replace the Spare Tire: Knowing when to replace your spare tire is critical. Tires usually have a lifespan of around 6-10 years, even if they appear unused. The Rubber Manufacturers Association advises checking for the date of manufacture on the tire’s sidewall. If your spare tire is older than a decade, replacing it is advisable, regardless of its physical condition.